Ubuntu update for linux



| Updated: 2025-04-23
Risk Low
Patch available YES
Number of vulnerabilities 6
CVE-ID CVE-2020-16119
CVE-2020-14314
CVE-2020-14385
CVE-2020-16120
CVE-2020-25285
CVE-2020-25641
CWE-ID CWE-416
CWE-125
CWE-119
CWE-264
CWE-476
CWE-835
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

linux-image-virtual-hwe-20.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-virtual (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-raspi2 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-raspi (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-oracle (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-oem-osp1 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-oem (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-lowlatency-hwe-20.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-lowlatency (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-kvm (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-gke (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-generic-lpae (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-generic-hwe-20.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-generic (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-gcp (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-azure (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-aws (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.4.0-1026-kvm (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-snapdragon-hwe-18.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-raspi-hwe-18.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-generic-lpae-hwe-18.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.4.0-51-generic-lpae (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.4.0-1021-raspi (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-virtual-hwe-18.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-lowlatency-hwe-18.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-generic-hwe-18.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.4.0-51-lowlatency (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.4.0-51-generic (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.4.0-1031-azure (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.4.0-1028-oracle (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.4.0-1028-gcp (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-5.4.0-1028-aws (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU68424

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-16119

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error caused by the reuse of a DCCP socket with an attached dccps_hc_tx_ccid object as a listener. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-virtual (Ubuntu package): before 5.4.0.51.54

linux-image-raspi2 (Ubuntu package): before 5.4.0.1021.56

linux-image-raspi (Ubuntu package): before 5.4.0.1021.56

linux-image-oracle (Ubuntu package): before 5.4.0.1028.12

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.51.54

linux-image-oem (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency (Ubuntu package): before 5.4.0.51.54

linux-image-kvm (Ubuntu package): before 5.4.0.1026.24

linux-image-gke (Ubuntu package): before 5.4.0.1028.36

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic-lpae (Ubuntu package): before 5.4.0.51.54

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic (Ubuntu package): before 5.4.0.51.54

linux-image-gcp (Ubuntu package): before 5.4.0.1028.16

linux-image-azure (Ubuntu package): before 5.4.0.1031.13

linux-image-aws (Ubuntu package): before 5.4.0.1028.13

linux-image-5.4.0-1026-kvm (Ubuntu package): before 5.4.0-1026.27

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1021.25

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-generic-lpae (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1021-raspi (Ubuntu package): before 5.4.0-1021.24~18.04.1

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-lowlatency (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-51-generic (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1031-azure (Ubuntu package): before 5.4.0-1031.32~18.04.1

linux-image-5.4.0-1028-oracle (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-gcp (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-aws (Ubuntu package): before 5.4.0-1028.29~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4576-1


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Out-of-bounds read

EUVDB-ID: #VU47106

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-14314

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local authenticated user to perform a denial of service (DoS) attack.

A memory out-of-bounds read flaw was found in the Linux kernel before 5.9-rc2 with the ext3/ext4 file system, in the way it accesses a directory with broken indexing. This flaw allows a local user to crash the system if the directory exists.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-virtual (Ubuntu package): before 5.4.0.51.54

linux-image-raspi2 (Ubuntu package): before 5.4.0.1021.56

linux-image-raspi (Ubuntu package): before 5.4.0.1021.56

linux-image-oracle (Ubuntu package): before 5.4.0.1028.12

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.51.54

linux-image-oem (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency (Ubuntu package): before 5.4.0.51.54

linux-image-kvm (Ubuntu package): before 5.4.0.1026.24

linux-image-gke (Ubuntu package): before 5.4.0.1028.36

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic-lpae (Ubuntu package): before 5.4.0.51.54

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic (Ubuntu package): before 5.4.0.51.54

linux-image-gcp (Ubuntu package): before 5.4.0.1028.16

linux-image-azure (Ubuntu package): before 5.4.0.1031.13

linux-image-aws (Ubuntu package): before 5.4.0.1028.13

linux-image-5.4.0-1026-kvm (Ubuntu package): before 5.4.0-1026.27

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1021.25

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-generic-lpae (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1021-raspi (Ubuntu package): before 5.4.0-1021.24~18.04.1

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-lowlatency (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-51-generic (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1031-azure (Ubuntu package): before 5.4.0-1031.32~18.04.1

linux-image-5.4.0-1028-oracle (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-gcp (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-aws (Ubuntu package): before 5.4.0-1028.29~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4576-1


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Buffer overflow

EUVDB-ID: #VU58841

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-14385

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the file system metadata validator in XFS. A local user can cause an inode with a valid, user-creatable extended attribute to be flagged as corrupt and shutdown the the filesystem.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-virtual (Ubuntu package): before 5.4.0.51.54

linux-image-raspi2 (Ubuntu package): before 5.4.0.1021.56

linux-image-raspi (Ubuntu package): before 5.4.0.1021.56

linux-image-oracle (Ubuntu package): before 5.4.0.1028.12

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.51.54

linux-image-oem (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency (Ubuntu package): before 5.4.0.51.54

linux-image-kvm (Ubuntu package): before 5.4.0.1026.24

linux-image-gke (Ubuntu package): before 5.4.0.1028.36

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic-lpae (Ubuntu package): before 5.4.0.51.54

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic (Ubuntu package): before 5.4.0.51.54

linux-image-gcp (Ubuntu package): before 5.4.0.1028.16

linux-image-azure (Ubuntu package): before 5.4.0.1031.13

linux-image-aws (Ubuntu package): before 5.4.0.1028.13

linux-image-5.4.0-1026-kvm (Ubuntu package): before 5.4.0-1026.27

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1021.25

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-generic-lpae (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1021-raspi (Ubuntu package): before 5.4.0-1021.24~18.04.1

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-lowlatency (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-51-generic (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1031-azure (Ubuntu package): before 5.4.0-1031.32~18.04.1

linux-image-5.4.0-1028-oracle (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-gcp (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-aws (Ubuntu package): before 5.4.0-1028.29~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4576-1


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Security restrictions bypass

EUVDB-ID: #VU99771

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-16120

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local privileged user to gain access to sensitive information.

The vulnerability exists due to security restrictions bypass error within the ovl_open_realfile() and ovl_change_flags() functions in fs/overlayfs/file.c. A local privileged user can gain access to sensitive information.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-virtual (Ubuntu package): before 5.4.0.51.54

linux-image-raspi2 (Ubuntu package): before 5.4.0.1021.56

linux-image-raspi (Ubuntu package): before 5.4.0.1021.56

linux-image-oracle (Ubuntu package): before 5.4.0.1028.12

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.51.54

linux-image-oem (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency (Ubuntu package): before 5.4.0.51.54

linux-image-kvm (Ubuntu package): before 5.4.0.1026.24

linux-image-gke (Ubuntu package): before 5.4.0.1028.36

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic-lpae (Ubuntu package): before 5.4.0.51.54

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic (Ubuntu package): before 5.4.0.51.54

linux-image-gcp (Ubuntu package): before 5.4.0.1028.16

linux-image-azure (Ubuntu package): before 5.4.0.1031.13

linux-image-aws (Ubuntu package): before 5.4.0.1028.13

linux-image-5.4.0-1026-kvm (Ubuntu package): before 5.4.0-1026.27

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1021.25

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-generic-lpae (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1021-raspi (Ubuntu package): before 5.4.0-1021.24~18.04.1

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-lowlatency (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-51-generic (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1031-azure (Ubuntu package): before 5.4.0-1031.32~18.04.1

linux-image-5.4.0-1028-oracle (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-gcp (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-aws (Ubuntu package): before 5.4.0-1028.29~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4576-1


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) NULL pointer dereference

EUVDB-ID: #VU90669

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-25285

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local privileged user to execute arbitrary code.

The vulnerability exists due to NULL pointer dereference within the allowed_mems_nr(), hugetlb_sysctl_handler_common() and hugetlb_overcommit_handler() functions in mm/hugetlb.c. A local privileged user can execute arbitrary code.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-virtual (Ubuntu package): before 5.4.0.51.54

linux-image-raspi2 (Ubuntu package): before 5.4.0.1021.56

linux-image-raspi (Ubuntu package): before 5.4.0.1021.56

linux-image-oracle (Ubuntu package): before 5.4.0.1028.12

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.51.54

linux-image-oem (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency (Ubuntu package): before 5.4.0.51.54

linux-image-kvm (Ubuntu package): before 5.4.0.1026.24

linux-image-gke (Ubuntu package): before 5.4.0.1028.36

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic-lpae (Ubuntu package): before 5.4.0.51.54

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic (Ubuntu package): before 5.4.0.51.54

linux-image-gcp (Ubuntu package): before 5.4.0.1028.16

linux-image-azure (Ubuntu package): before 5.4.0.1031.13

linux-image-aws (Ubuntu package): before 5.4.0.1028.13

linux-image-5.4.0-1026-kvm (Ubuntu package): before 5.4.0-1026.27

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1021.25

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-generic-lpae (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1021-raspi (Ubuntu package): before 5.4.0-1021.24~18.04.1

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-lowlatency (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-51-generic (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1031-azure (Ubuntu package): before 5.4.0-1031.32~18.04.1

linux-image-5.4.0-1028-oracle (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-gcp (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-aws (Ubuntu package): before 5.4.0-1028.29~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4576-1


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Infinite loop

EUVDB-ID: #VU48941

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-25641

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect implementation of biovecs in Linux kernel. A zero-length biovec request issued by the block subsystem could cause the kernel to enter an infinite loop, causing a denial of service. A local user can issue requests to a block device and perform a denial of service (DoS) attack.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-virtual (Ubuntu package): before 5.4.0.51.54

linux-image-raspi2 (Ubuntu package): before 5.4.0.1021.56

linux-image-raspi (Ubuntu package): before 5.4.0.1021.56

linux-image-oracle (Ubuntu package): before 5.4.0.1028.12

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.51.54

linux-image-oem (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-lowlatency (Ubuntu package): before 5.4.0.51.54

linux-image-kvm (Ubuntu package): before 5.4.0.1026.24

linux-image-gke (Ubuntu package): before 5.4.0.1028.36

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic-lpae (Ubuntu package): before 5.4.0.51.54

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.4.0.51.54

linux-image-generic (Ubuntu package): before 5.4.0.51.54

linux-image-gcp (Ubuntu package): before 5.4.0.1028.16

linux-image-azure (Ubuntu package): before 5.4.0.1031.13

linux-image-aws (Ubuntu package): before 5.4.0.1028.13

linux-image-5.4.0-1026-kvm (Ubuntu package): before 5.4.0-1026.27

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1021.25

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-generic-lpae (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1021-raspi (Ubuntu package): before 5.4.0-1021.24~18.04.1

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.51.56~18.04.45

linux-image-5.4.0-51-lowlatency (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-51-generic (Ubuntu package): before 5.4.0-51.56~18.04.1

linux-image-5.4.0-1031-azure (Ubuntu package): before 5.4.0-1031.32~18.04.1

linux-image-5.4.0-1028-oracle (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-gcp (Ubuntu package): before 5.4.0-1028.29~18.04.1

linux-image-5.4.0-1028-aws (Ubuntu package): before 5.4.0-1028.29~18.04.1

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4576-1


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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