SUSE update for the Linux Kernel (Live Patch 10 for SLE 15 SP2)



Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-29368
CVE-2020-29373
CWE-ID CWE-787
CWE-264
Exploitation vector Local
Public exploit N/A
Vulnerable software
 SUSE Linux Enterprise Module for Live Patching
Operating systems & Components / Operating system

kernel-livepatch-SLE15-SP2_Update_10-debugsource
Operating systems & Components / Operating system package or component

kernel-livepatch-5_3_18-24_49-default-debuginfo
Operating systems & Components / Operating system package or component

kernel-livepatch-5_3_18-24_49-default
Operating systems & Components / Operating system package or component

Vendor SUSE

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds write

EUVDB-ID: #VU51549

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-2020-29368

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 within the __split_huge_pmd() function in mm/huge_memory.c in the Linux kernel. A local user can abuse the copy-on-write implementation and gain unintended write access because of a race condition in a THP mapcount check.


Mitigation

Update the affected package the Linux Kernel (Live Patch 10 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_10-debugsource: before 2-2.2

kernel-livepatch-5_3_18-24_49-default-debuginfo: before 2-2.2

kernel-livepatch-5_3_18-24_49-default: before 2-2.2

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210869-1/


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) Security restrictons bypass

EUVDB-ID: #VU51550

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-29373

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists in fs/io_uring.c in the Linux kernel due to insecure handling of the root directory during path lookups. A process inside a mount namespace can escape to unintended filesystem locations and read sensitive information.

Mitigation

Update the affected package the Linux Kernel (Live Patch 10 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_10-debugsource: before 2-2.2

kernel-livepatch-5_3_18-24_49-default-debuginfo: before 2-2.2

kernel-livepatch-5_3_18-24_49-default: before 2-2.2

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20210869-1/


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.



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