Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-74483
Published: August 16, 2026
Vulnerability identifier: #VU143292
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-2026-74483
CWE-ID: CWE-772
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper resource shutdown in binfmt_misc superblock handling when mounting binfmt_misc in a user namespace and triggering mount failure. A remote attacker can repeatedly trigger failed mounts to cause a denial of service.
Exploitation is possible by an unprivileged caller under a tight memory cgroup, which can force mount failures and leak one user namespace per attempt.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74483
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1