Use-after-free in Linux kernel - CVE-2026-53264
Published: June 26, 2026
Vulnerability identifier: #VU135486
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-53264
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the net/sched action lifecycle handling in act_api when NEWTFILTER and DELFILTER are run concurrently. A local user can trigger concurrent filter operations to cause a denial of service.
The issue arises from a race between action lookup and action deletion under RCU-protected access.
How to mitigate CVE-2026-53264
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/18af5d2ef0c4f65787fd1280c8b23286b9f2a835
- https://git.kernel.org/stable/c/1f1b98fea6b9ea30507d0f2fbff6750292d097e2
- https://git.kernel.org/stable/c/5057e1aca011e51ef51498c940ef96f3d3e8a305
- https://git.kernel.org/stable/c/5dd51e09020c65aa53cf128e5e3517cd53b3c113
- https://git.kernel.org/stable/c/8b136f18ac4b2ace5aaad3305b3f8a5d8165a009
- https://git.kernel.org/stable/c/91d105d2cbe002f9c7b43a6183adedc37e1da1f7
- https://git.kernel.org/stable/c/98b2e40879abf0245be5a5b7af69e0f6ff524ac3
- https://git.kernel.org/stable/c/b60e9391142e983fab2be53497aa8f71fdd09cd5