SUSE update for the Linux Kernel (Live Patch 41 for SLE 12 SP3)

Published: 2022-02-22

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-4083 CVE-2021-4202
CWE-ID	CWE-416
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	SUSE Linux Enterprise Server for SAP Operating systems & Components / Operating system SUSE Linux Enterprise Server Operating systems & Components / Operating system kgraft-patch-4_4_180-94_150-default-debuginfo Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_150-default Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_147-default-debuginfo Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_147-default Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_144-default-debuginfo Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_144-default Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_141-default-debuginfo Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_141-default Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_138-default-debuginfo Operating systems & Components / Operating system package or component kgraft-patch-4_4_180-94_138-default Operating systems & Components / Operating system package or component
Vendor	SUSE

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) 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.

Mitigation

Update the affected package the Linux Kernel (Live Patch 41 for SLE 12 SP3) to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Server for SAP: 12-SP3

SUSE Linux Enterprise Server: 12-SP3-LTSS

kgraft-patch-4_4_180-94_150-default-debuginfo: before 4-2.2

kgraft-patch-4_4_180-94_150-default: before 4-2.2

kgraft-patch-4_4_180-94_147-default-debuginfo: before 8-2.2

kgraft-patch-4_4_180-94_147-default: before 8-2.2

kgraft-patch-4_4_180-94_144-default-debuginfo: before 11-2.2

kgraft-patch-4_4_180-94_144-default: before 11-2.2

kgraft-patch-4_4_180-94_141-default-debuginfo: before 14-2.2

kgraft-patch-4_4_180-94_141-default: before 14-2.2

kgraft-patch-4_4_180-94_138-default-debuginfo: before 15-2.2

kgraft-patch-4_4_180-94_138-default: before 15-2.2

External links

http://www.suse.com/support/update/announcement/2022/suse-su-20220552-1/

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) Use-after-free

EUVDB-ID: #VU63764