Use-after-free in Linux kernel - CVE-2026-80579
Published: August 27, 2026
Vulnerability identifier: #VU145905
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80579
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.
The vulnerability exists due to a use-after-free in the fbdev mode handling logic when processing FBIOPUT_VSCREENINFO requests with FB_ACTIVATE_INV_MODE. A local user can delete a videomode that is still referenced by fb_info->mode to disclose sensitive information, modify data, or cause a denial of service.
The stale pointer may later be dereferenced during sysfs mode reads through show_mode().
Affected software
Linux kernel
How to mitigate CVE-2026-80579
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3