Race condition in Linux kernel - CVE-2026-74700
Published: August 24, 2026
Vulnerability identifier: #VU144635
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74700
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a use-after-free.
The vulnerability exists due to a race condition in net/sched/cls_api.c when handling concurrent classifier creation requests in the same chain and priority. A local user can trigger concurrent u32 and flower filter operations to cause a use-after-free.
Exploitation requires concurrent requests that race during tc_new_tfilter processing.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74700
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/34e77d8e3570f9df3952496ddb402833695662fd
- https://git.kernel.org/stable/c/a347304b2ca1a5377d5bd2d8a72e4b4f12afe648
- https://git.kernel.org/stable/c/a81f9c44d87fb59d99fce72e29e02cab3a49a1c3
- https://git.kernel.org/stable/c/b648c8a56531aeabd1c14f6b5cf1891e269b3756
- https://git.kernel.org/stable/c/d6222af7274f08e7a1848131dc30319993d8f377