SB20260816403 - Use-after-free in Linux kernel can
Published: August 16, 2026
Security Bulletin ID
SB20260816403
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-2026-72123)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the can bcm rx operation handling in net/can/bcm.c when tearing down bcm rx operations concurrently with packet reception and timer activity. A local user can trigger a race condition to cause a denial of service.
The issue involves a thrtimer callback dereferencing a deallocated bcm_op object after an RCU grace period elapses.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/3cf4fd5316f449811d8baf1bc6978ef5a7b743a9
- https://git.kernel.org/stable/c/4177762f70646ac48a2af382e45a795cbd295198
- https://git.kernel.org/stable/c/68973f9db76144825e4f35dfdc80fb8279eb2d57
- https://git.kernel.org/stable/c/6fd08e8d826c3aa4cc7021f5f9cdbb7fa7441d3f
- https://git.kernel.org/stable/c/cd830e0bc25ee2d38cbfbdbb3cd77c5f53b2b6d5
- https://git.kernel.org/stable/c/ce2d4b121fb7545e1ed588e860c8e5fd5ad45224