SB2021031732 - SUSE update for the Linux Kernel (Live Patch 10 for SLE 15 SP2)

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2021031732

SB2021031732 - SUSE update for the Linux Kernel (Live Patch 10 for SLE 15 SP2)

Published: March 17, 2021

Security Bulletin ID SB2021031732
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Out-of-bounds write (CVE-ID: CVE-2020-29368)

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

CVSSv4: 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


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.



2) Security restrictons bypass (CVE-ID: CVE-2020-29373)

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

CVSSv4: 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


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.


Remediation

Install update from vendor's website.

References