SB20260812267 - Out-of-bounds write in Linux kernel drm display driver
Published: August 12, 2026
Security Bulletin ID
SB20260812267
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Physical access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-68278)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 5.2 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows an attacker with physical access to cause memory corruption.
The vulnerability exists due to out-of-bounds write in drm_dp_sideband_append_payload() when processing forged DP MST sideband reply messages from a connected device. An attacker with physical access can send crafted sideband reply data to cause memory corruption.
The issue is reachable from a DP MST device over a physical connection.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1e5827839ad0ceb0079d1560c321fa3656b54f21
- https://git.kernel.org/stable/c/53937a2787d29c7a460e984dc4f20ff6ac91dc65
- https://git.kernel.org/stable/c/55bd5e685bda455b9b50c835f8c8442d52a344a3
- https://git.kernel.org/stable/c/a6366b551079c79bf7bdbadd74c97358bcfe2d58
- https://git.kernel.org/stable/c/ef0dbcc200c3389f1f781ab181932a97e54b51af