Fedora 35 update for kernel, kernel-headers, kernel-tools



Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-4095
CVE-2021-4204
CVE-2022-1204
CWE-ID CWE-476
CWE-125
CWE-416
Exploitation vector Local
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
 Fedora
Operating systems & Components / Operating system

kernel-tools
Operating systems & Components / Operating system package or component

kernel-headers
Operating systems & Components / Operating system package or component

kernel
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU59895

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-2021-4095

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error within the Linux kernel's KVM when dirty ring logging is enabled without an active vCPU context in kvm_dirty_ring_get() function in virt/kvm/dirty_ring.c. A local user can pass specially crafted input to the KVM_XEN_HVM_SET_ATTR IOCTL and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 35

kernel-tools: before 5.17.4-200.fc35

kernel-headers: before 5.17.4-200.fc35

kernel: before 5.17.4-200.fc35

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2022-8efcea6e67


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: #VU86247

Risk: Low

CVSSv4.0: 5.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2021-4204

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

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary condition in Linux kernel eBPF. A local user trigger an out-of-bounds read error and read contents of memory on the system or crash the kernel.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 35

kernel-tools: before 5.17.4-200.fc35

kernel-headers: before 5.17.4-200.fc35

kernel: before 5.17.4-200.fc35

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2022-8efcea6e67


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. However, proof of concept for this vulnerability is available.

3) Use-after-free

EUVDB-ID: #VU63791

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-2022-1204

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 in the Linux kernel’s Amateur Radio AX.25 protocol functionality when user connects with the protocol. A local user can trigger use-after-free error to perform a denial of service attack or escalate privileges on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Fedora: 35

kernel-tools: before 5.17.4-200.fc35

kernel-headers: before 5.17.4-200.fc35

kernel: before 5.17.4-200.fc35

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2022-8efcea6e67


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.



###SIDEBAR###