SUSE update for the Linux Kernel (Live Patch 39 for SLE 12 SP3)

1) Use-after-free

EUVDB-ID: #VU59811

Risk: Low

CVSSv4.0: 7.1 [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:A/U:Clear]

CVE-ID: CVE-2021-0920

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 unix_scm_to_skb() function of af_unix.c in Linux kernel. A local user can run a specially crafted program to trigger a race condition and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package the Linux Kernel (Live Patch 39 for SLE 12 SP3) to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server: 12-SP3-LTSS - 15-SP3-LTSS

SUSE Linux Enterprise High Performance Computing: 15-SP3-LTSS

SUSE Linux Enterprise Module for Live Patching: 15-SP4

SUSE Linux Enterprise Server for SAP Applications: 15

SUSE Linux Enterprise Live Patching: 12-SP4

SUSE Linux Enterprise Server for SAP: 12-SP3

kgraft-patch-4_12_14-95_77-default: before 11-2.1

kernel-livepatch-4_12_14-150_78-default-debuginfo: before 4-2.1

kernel-livepatch-4_12_14-150_78-default: before 4-2.1

kernel-livepatch-4_12_14-150_75-default-debuginfo: before 9-2.1

kernel-livepatch-4_12_14-150_75-default: before 9-2.1

kernel-livepatch-4_12_14-150_72-default-debuginfo: before 12-2.1

kernel-livepatch-4_12_14-150_72-default: before 12-2.1

kernel-livepatch-4_12_14-150_69-default-debuginfo: before 15-2.2

kernel-livepatch-4_12_14-150_69-default: before 15-2.2

kgraft-patch-4_4_180-94_150-default-debuginfo: before 5-2.1

kgraft-patch-4_4_180-94_150-default: before 5-2.1

kgraft-patch-4_4_180-94_147-default-debuginfo: before 9-2.1

kgraft-patch-4_4_180-94_147-default: before 9-2.1

kgraft-patch-4_4_180-94_144-default-debuginfo: before 12-2.1

kgraft-patch-4_4_180-94_144-default: before 12-2.1

kgraft-patch-4_4_180-94_141-default-debuginfo: before 15-2.2

kgraft-patch-4_4_180-94_141-default: before 15-2.2

CPE2.3

• cpe:2.3:o:suse:suse_linux_enterprise_server:12-SP3-LTSS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:15-SP3-LTSS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_high_performance_computing:15-SP3-LTSS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_module_for_live_patching:15-SP4:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server_for_sap_applications:15:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_live_patching:12-SP4:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server_for_sap:12-SP3:*:*:*:*:*:*:*
• cpe:2.3:a:suse:kgraft-patch-4_12_14-95_77-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_78-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_78-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_75-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_75-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_72-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_72-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_69-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kernel-livepatch-4_12_14-150_69-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_4_180-94_150-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_4_180-94_150-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_4_180-94_147-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_4_180-94_147-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_4_180-94_144-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_4_180-94_144-default:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_4_180-94_141-default-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:kgraft-patch-4_4_180-94_141-default:*:*:*:*:*:suse_linux:*:*

External links

https://www.suse.com/support/update/announcement/2022/suse-su-20220667-1/

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.