SB2026082751 - Use-after-free in Linux kernel fbdev core driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-80579)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 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]

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().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/95e647d2a5304a8fd11f1ba3c8502de700650131
• https://git.kernel.org/stable/c/ce7fef961c63229b22dec415fb988899f479d61f