SB20260625263 - Use-after-free in Linux kernel ipc
Published: June 25, 2026
Security Bulletin ID
SB20260625263
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-2026-52923)
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 ipc_idr_alloc() in the checkpoint/restore SysV IPC allocation path when processing a request for the next SysV IPC id. A local user can request allocation beyond the valid IPC id range to cause a denial of service.
A subsequent walk of /proc/sysvipc/shm can dereference freed memory through a stale IDR entry.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/157ce2c6836ce0ff19108a819f38df061345425f
- https://git.kernel.org/stable/c/3bbe2bb9111ce6967a951bfac79af142d816fae5
- https://git.kernel.org/stable/c/41058d4c3f63ab64901560a704882e0565f4e456
- https://git.kernel.org/stable/c/8c58a92849175f5e2ab7bc2734b3b89afe79f6ef
- https://git.kernel.org/stable/c/a3cc795129e5ec0f8948653a3bf471e7d8852f5e
- https://git.kernel.org/stable/c/af24e202b543ded8a34f1d5d3db54eb916173f04
- https://git.kernel.org/stable/c/bd4be70669af55b974860d13680348cfdf50bbed
- https://git.kernel.org/stable/c/fa0b9b2b7ae3539908d69c2b9ac0d144d9bc5139