Out-of-bounds write in Linux kernel - CVE-2026-89724
Published: September 12, 2026
Vulnerability identifier: #VU149079
CSH Severity: Low
CVSS v4: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89724
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt adjacent kernel heap memory.
The vulnerability exists due to an out-of-bounds write in the vicodec FWHT encoder when encoding a four-component pixel format whose planes take the unencoded fallback. A local user can submit a crafted frame to corrupt adjacent kernel heap memory.
Affected software
Linux kernel
How to mitigate CVE-2026-89724
Install security update from vendor's repository.