SUSE update for the Linux Kernel (Live Patch 15 for SLE 15 SP2)

Published: 2021-11-17

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-3752 CVE-2021-41864
CWE-ID	CWE-416 CWE-787
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software	SUSE Linux Enterprise Module for Live Patching Operating systems & Components / Operating system kernel-livepatch-SLE15-SP2_Update_9-debugsource Operating systems & Components / Operating system package or component kernel-livepatch-SLE15-SP2_Update_8-debugsource Operating systems & Components / Operating system package or component kernel-livepatch-SLE15-SP2_Update_7-debugsource Operating systems & Components / Operating system package or component kernel-livepatch-SLE15-SP2_Update_15-debugsource Operating systems & Components / Operating system package or component kernel-livepatch-SLE15-SP2_Update_13-debugsource Operating systems & Components / Operating system package or component kernel-livepatch-SLE15-SP2_Update_12-debugsource Operating systems & Components / Operating system package or component kernel-livepatch-SLE15-SP2_Update_11-debugsource Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_64-default-debuginfo Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_64-default Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_61-default-debuginfo Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_61-default Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_53_4-default-debuginfo Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_53_4-default Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_52-default-debuginfo Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_52-default Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_46-default-debuginfo Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_46-default Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_43-default-debuginfo Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_43-default Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_37-default-debuginfo Operating systems & Components / Operating system package or component kernel-livepatch-5_3_18-24_37-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: #VU63767

Risk: Low

CVSSv4.0: 4.8 [CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3752

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in the Linux kernel’s Bluetooth subsystem when a user calls connect to the socket and disconnect simultaneously. A local user can escalate privileges on the system.

Mitigation

Update the affected package the Linux Kernel (Live Patch 15 for SLE 15 SP2) to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Live Patching: 15-SP2

kernel-livepatch-SLE15-SP2_Update_9-debugsource: before 13-2.2

kernel-livepatch-SLE15-SP2_Update_8-debugsource: before 13-2.2

kernel-livepatch-SLE15-SP2_Update_7-debugsource: before 14-2.2

kernel-livepatch-SLE15-SP2_Update_15-debugsource: before 6-2.2

kernel-livepatch-SLE15-SP2_Update_13-debugsource: before 8-2.2

kernel-livepatch-SLE15-SP2_Update_12-debugsource: before 8-2.2

kernel-livepatch-SLE15-SP2_Update_11-debugsource: before 11-2.2

kernel-livepatch-5_3_18-24_64-default-debuginfo: before 8-2.2

kernel-livepatch-5_3_18-24_64-default: before 8-2.2

kernel-livepatch-5_3_18-24_61-default-debuginfo: before 8-2.2

kernel-livepatch-5_3_18-24_61-default: before 8-2.2

kernel-livepatch-5_3_18-24_53_4-default-debuginfo: before 6-2.2

kernel-livepatch-5_3_18-24_53_4-default: before 6-2.2

kernel-livepatch-5_3_18-24_52-default-debuginfo: before 11-2.2

kernel-livepatch-5_3_18-24_52-default: before 11-2.2

kernel-livepatch-5_3_18-24_46-default-debuginfo: before 13-2.2

kernel-livepatch-5_3_18-24_46-default: before 13-2.2

kernel-livepatch-5_3_18-24_43-default-debuginfo: before 13-2.2

kernel-livepatch-5_3_18-24_43-default: before 13-2.2

kernel-livepatch-5_3_18-24_37-default-debuginfo: before 14-2.2

kernel-livepatch-5_3_18-24_37-default: before 14-2.2

CPE2.3

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20213710-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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

2) Out-of-bounds write

EUVDB-ID: #VU63855

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-2021-41864

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing untrusted input. A local user can gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information.