SB20260507113 - Use-after-free in Linux kernel drm atmel-hlcdc driver
Published: May 7, 2026
Security Bulletin ID
SB20260507113
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-43236)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in atmel_hlcdc_plane_atomic_duplicate_state() when handling drm atomic commit operations after duplicating plane state. A local user can close and re-open the device node while another DRM client is still attached to cause a denial of service.
It can be triggered in a scenario where another DRM client such as fbdev remains attached.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/549c6db503dbb85dbff4840830971853feac6625
- https://git.kernel.org/stable/c/6404898af86d986db1dbbe06177c143e40652e49
- https://git.kernel.org/stable/c/796e77c14c4c1e2cd36473760fb6cc66c695eb47
- https://git.kernel.org/stable/c/7b4d0fab3ff2c00c6d34e1952c9df5129a826aee
- https://git.kernel.org/stable/c/a205740a7231e967ac77cb731171642901c327af
- https://git.kernel.org/stable/c/ac2d898da5095d46bd1ff8585fdd753d58ad91e7
- https://git.kernel.org/stable/c/bc847787233277a337788568e90a6ee1557595eb
- https://git.kernel.org/stable/c/fd4a4d0711f48a99b25bcd45e00eef8339eff82d