Use-after-free in Linux kernel - CVE-2026-74490
Published: August 16, 2026
Vulnerability identifier: #VU143299
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-2026-74490
CWE-ID: CWE-416
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 use-after-free in tipc_poll() trace queue dumping when walking live socket queue members from an unlocked poll context. A local user can trigger polling while queue entries are concurrently dequeued and freed to cause a denial of service.
The issue occurs in the TIPC socket trace path during queue state dumping.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74490
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/5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d
- https://git.kernel.org/stable/c/ac2f787980fdf4364cd5651a4c8128e59b8de3aa
- https://git.kernel.org/stable/c/b4f1719dfea023220e0e6bd892b087d76b2a6a49
- https://git.kernel.org/stable/c/bed792737b5f1ba773054dbe984502958bdfe6ce
- https://git.kernel.org/stable/c/d7940bb6a8e7ab28f972c2875cb05783216312dc