Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-74619
Published: August 24, 2026
Vulnerability identifier: #VU144948
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-2026-74619
CWE-ID: CWE-670
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper handling of a user namespace mismatch in ovl_fill_super() when completing an overlayfs mount context from another user namespace. A local user can pass a crafted fscontext file descriptor between namespaces and repeatedly issue FSCONFIG_CMD_CREATE to cause a denial of service.
The issue can be triggered without special capabilities by using separate user and mount namespaces, and repeated triggering can taint the kernel, flood system logs, or panic systems configured with panic_on_warn.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74619
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
External References
- https://git.kernel.org/stable/c/42d99fcd8006007e2f708bede6789f37f3910b30
- https://git.kernel.org/stable/c/494346f2aab2489d379d43ff614aea447cf4e94d
- https://git.kernel.org/stable/c/513478092966dc9818d96dd2b3ed613fd2f6e30e
- https://git.kernel.org/stable/c/63981fc786daaa626cb14d9be1406f674d79f98f
- https://git.kernel.org/stable/c/be161fa31e3e9cc828a3c1bd935edca461e8a7a1