SB2024053147 - Use-after-free in Linux kernel fbdev core driver
Published: May 31, 2024 Updated: May 14, 2025
Security Bulletin ID
SB2024053147
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-2021-47338)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the fb_set_var() function in drivers/video/fbdev/core/fbmem.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/359311b85ebec7c07c3a08ae2f3def946cad33fa
- https://git.kernel.org/stable/c/087bff9acd2ec6db3f61aceb3224bde90fe0f7f8
- https://git.kernel.org/stable/c/f193509afc7ff37a46862610c93b896044d5b693
- https://git.kernel.org/stable/c/d6e76469157d8f240e5dec6f8411aa8d306b1126
- https://git.kernel.org/stable/c/0af778269a522c988ef0b4188556aba97fb420cc
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.52
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.19
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13.4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.134