SB2021052655 - Privilege escalation in Linux kernel
Published: May 26, 2021 Updated: November 22, 2023
Security Bulletin ID
SB2021052655
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2020-25668)
The vulnerability allows a local authenticated user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the con_font_op. A local authenticated user can trigger a use-after-free error and escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=90bfdeef83f1d6c696039b6a917190dcbbad3220
- https://www.openwall.com/lists/oss-security/2020/10/30/1,
- http://www.openwall.com/lists/oss-security/2020/11/04/3
- https://bugzilla.redhat.com/show_bug.cgi?id=1893287,
- http://www.openwall.com/lists/oss-security/2020/10/30/1
- https://www.openwall.com/lists/oss-security/2020/11/04/3,
- https://security.netapp.com/advisory/ntap-20210702-0005/