Improper locking in Linux kernel - CVE-2025-37880

Vulnerability identifier: #VU108877

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-2025-37880

CWE-ID: CWE-667

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper locking within the handle_syscall() function in arch/um/kernel/skas/syscall.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)

Install update from vendor's website.

Linux kernel - update to 6.12.26
linux (Ubuntu package) - addressed in versions 6.14.0-22.22, 6.14.0-1004.4, 6.14.0-1007.7, 6.14.0-1008.8
linux-azure (Ubuntu package) - update to 6.14.0-1007.7
linux-aws (Ubuntu package) - addressed in versions 6.14.0-1007.7, 6.14.0-1007.7+1

• https://git.kernel.org/stable/c/887c5c12e80c8424bd471122d2e8b6b462e12874
• https://git.kernel.org/stable/c/990ddc65173776f1e01e7135d8c1fd5f8fd4d5d2
• https://git.kernel.org/stable/c/da780c4a075ba2deb05ae29f0af4a990578c7901
• https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.26

• Improper locking in Linux kernel include linux
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws