Use-after-free in Linux kernel - CVE-2026-53160
Published: June 26, 2026
Vulnerability identifier: #VU135624
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-2026-53160
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 use-after-free condition.
The vulnerability exists due to a use-after-free race in fastrpc_map_create in drivers/misc/fastrpc.c when handling concurrent MEM_UNMAP operations during map lookup and reference acquisition. A local user can trigger concurrent map operations to cause a use-after-free condition.
The issue occurs because a raw pointer is returned after releasing fl->lock and is later referenced without atomic reference acquisition under the lock.
How to mitigate CVE-2026-53160
Install security update from vendor's repository.
Sources
- https://git.kernel.org/stable/c/07ebe87915d8accdaba20c4f88c5ae430fe62fbb
- https://git.kernel.org/stable/c/0a3b87293fbd34fda651e6aead9964f84b893962
- https://git.kernel.org/stable/c/5b0166112019d1dce30b976ab28fd67f7f0be532
- https://git.kernel.org/stable/c/8b080c89183196fd3e49212f2a1a1c4a29335b9c
- https://git.kernel.org/stable/c/992f121796b7ca83a5a8b93da24e971363206218
- https://git.kernel.org/stable/c/f20f6512ecb75c816e0debf4551a138f098615c4