Ubuntu update for linux-hwe-5.13

Published: 2022-02-18 | Updated: 2024-03-30

Risk	Low
Patch available	YES
Number of vulnerabilities	5
CVE-ID	CVE-2021-22600 CVE-2021-4083 CVE-2021-4155 CVE-2022-0330 CVE-2022-22942
CWE-ID	CWE-415 CWE-416 CWE-264 CWE-119
Exploitation vector	Local
Public exploit	Vulnerability #1 is being exploited in the wild. Vulnerability #5 is being exploited in the wild.
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system linux-image-generic-64k-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.13.0-30-generic-64k (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.13.0-30-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual-hwe-20.04 (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-generic-lpae-hwe-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.13.0-30-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-5.13.0-30-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Double Free

EUVDB-ID: #VU63766

Risk: High

CVSSv3.1: 8.4 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-22600

CWE-ID: CWE-415 - Double Free

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error in the packet_set_ring() function in net/packet/af_packet.c. A local user can pass specially crafted data to the application, trigger double free error and escalate privileges on the system.

Note, the vulnerability is being actively exploited in the wild against Android users.

Mitigation

Update the affected package linux-hwe-5.13 to the latest version.

Vulnerable software versions

Ubuntu: 20.04

linux-image-generic-64k-hwe-20.04 (Ubuntu package): before 5.13.0.30.33~20.04.17

linux-image-5.13.0-30-generic-64k (Ubuntu package): before 5.13.0-30.33~20.04.1

linux-image-5.13.0-30-generic (Ubuntu package): before 5.13.0-30.33~20.04.1

linux-image-virtual-hwe-20.04 (Ubuntu package): before 5.13.0.30.33~20.04.17

linux-image-lowlatency-hwe-20.04 (Ubuntu package): before 5.13.0.30.33~20.04.17

linux-image-generic-lpae-hwe-20.04 (Ubuntu package): before 5.13.0.30.33~20.04.17

linux-image-5.13.0-30-generic-lpae (Ubuntu package): before 5.13.0-30.33~20.04.1

linux-image-generic-hwe-20.04 (Ubuntu package): before 5.13.0.30.33~20.04.17

linux-image-5.13.0-30-lowlatency (Ubuntu package): before 5.13.0-30.33~20.04.1

External links

http://ubuntu.com/security/notices/USN-5295-1

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?

Yes. This vulnerability is being exploited in the wild.

2) Use-after-free

EUVDB-ID: #VU61246

Risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-4083

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 within the Linux kernel's garbage collection for Unix domain socket file handlers. A local user can call close() and fget() simultaneously and can potentially trigger a race condition, which in turn leads to a use-after-free error and allows privilege escalation.