Use-after-free in Linux kernel - CVE-2025-21939

Vulnerability identifier: #VU106617

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-2025-21939

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the xe_mark_range_accessed() and xe_hmm_userptr_populate_range() functions in drivers/gpu/drm/xe/xe_hmm.c. A local user can escalate privileges on the system.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-azure (Ubuntu package)
linux-oem-6.11 (Ubuntu package)

Install update from vendor's website.

Linux kernel - update to 6.13.7
linux (Ubuntu package) - addressed in versions 6.11.0-28.28, 6.11.0-28.28~24.04.1, 6.11.0-1011.11, 6.11.0-1014.14, 6.11.0-1015.16, 6.11.0-1016.16, 6.11.0-1016.16~24.04.1, 6.11.0-1017.18
linux-lowlatency (Ubuntu package) - addressed in versions 6.11.0-1015.16, 6.11.0-1015.16~24.04.2
linux-azure (Ubuntu package) - addressed in versions 6.11.0-1018.18, 6.11.0-1018.18~24.04.1
linux-oem-6.11 (Ubuntu package) - update to 6.11.0-1024.24

• https://git.kernel.org/stable/c/0a98219bcc961edd3388960576e4353e123b4a51
• https://git.kernel.org/stable/c/2a24c98f0e4cc994334598d4f3a851972064809d
• https://git.kernel.org/stable/c/f9326f529da7298a95643c3267f1c0fdb0db55eb
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.7

• Use-after-free in Linux kernel drm xe driver
• Ubuntu update for linux
• Ubuntu update for linux-oem-6.11
• Ubuntu update for linux-lowlatency
• Ubuntu update for linux-azure