Use-after-free in Linux kernel - CVE-2026-52947
Published: June 25, 2026
Vulnerability identifier: #VU135431
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-52947
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 qrtr_port_remove in the qrtr socket subsystem when handling concurrent qrtr port removal and lookup operations under RCU. A local user can trigger the race condition to cause a denial of service.
The issue arises because a socket pointer can remain reachable through the qrtr_ports XArray before the RCU grace period elapses.
How to mitigate CVE-2026-52947
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/03bfa95e452e2b6ccd76a332060ae4feaf5ad84d
- https://git.kernel.org/stable/c/2047c2aa0963bb2872fd722300a15bcb441a4c00
- https://git.kernel.org/stable/c/2aa4c12723fe432e623462a3be42a197a128722b
- https://git.kernel.org/stable/c/3b20ec8f31e8a6a6782243f473b0abd3463621df
- https://git.kernel.org/stable/c/474293d90880622fde9d2430fb0165767090f7b3
- https://git.kernel.org/stable/c/7de2d447072be3b1a76793f034432338fc9c494b
- https://git.kernel.org/stable/c/a2171131ecda1ed61a594a1eb715e75fdad0fef5
- https://git.kernel.org/stable/c/ab269990ed58143a92a263be1bee626d82ac03da