Use-after-free in Linux kernel - CVE-2026-52923
Published: June 25, 2026
Vulnerability identifier: #VU135451
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-2026-52923
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 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.
How to mitigate CVE-2026-52923
Install security update from vendor's repository.
Sources
- 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