SB20260625242 - Use-after-free in Linux kernel qrtr
Published: June 25, 2026
Security Bulletin ID
SB20260625242
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-52947)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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
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.
Remediation
Install update from vendor's website.
References
- 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