Use-after-free in Linux kernel - CVE-2026-64245

Vulnerability identifier: #VU139754

CSH Severity: Low

CVSS v4: 6.8 [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]

CVE-ID: CVE-2026-64245

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in fb_find_mode() in the fbdev modedb component when processing a NULL mode option. A local user can trigger the vulnerable code path to cause a denial of service.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13

• https://git.kernel.org/stable/c/13b6f0cdd5cd5e60f682ec43134ab0e2024bd356
• https://git.kernel.org/stable/c/4d418cf8daf57e454b4d855bf9b2419fd8e6a540
• https://git.kernel.org/stable/c/85b6256469cebdac395e7447147e06b2e151014f
• https://git.kernel.org/stable/c/c7dc382439f7b019e207055b52e9cec051d42fa9
• https://git.kernel.org/stable/c/f906347d75c7fc377041c6d3c535d0f08846aada

• Use-after-free in Linux kernel fbdev core driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0