Use-after-free in Linux kernel - CVE-2025-39979

Vulnerability identifier: #VU117263

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-2025-39979

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 include/linux/mlx5/fs.h. A local user can escalate privileges on the system.

Linux kernel
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Netezza Appliance
kernel (Red Hat package)

Install update from vendor's repository.

Netezza Appliance - update to 1.0.1.0 fp278500
kernel (Red Hat package) - update to 6.12.0-124.20.1.el10_1

• https://git.kernel.org/stable/c/3c77f6d244188c3fb11f6aec40bbfe884f1803b5
• https://git.kernel.org/stable/c/6043819e707cefb1c9e59d6e431dcfa735c4f975

• Use-after-free in Linux kernel linux mlx5
• Red Hat Enterprise Linux 10 update for kernel
• Multiple vulnerabilities in IBM Netezza Appliance