CVE-2026-53160 misc: fastrpc: fix use-after-free race in fastrpc_map_create
A use-after-free race condition in the Linux kernel's fastrpc driver allows attackers to execute arbitrary code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53160?
CVE-2026-53160 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
misc: fastrpc: fix use-after-free race in fastrpc_map_create
fastrpc_map_lookup returns a raw pointer after releasing fl->lock. The caller fastrpc_map_create then calls fastrpc_map_get (kref_get_unless_zero) on this unprotected pointer. A concurrent MEM_UNMAP can free the map between the lock release and the kref operation, resulting in a use-after-free on the freed slab object.
Restore the take_ref parameter to fastrpc_map_lookup so the reference is acquired atomically under fl->lock before the pointer is exposed to the caller.
Weakness: CWE-416
Which versions are affected by CVE-2026-53160?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53160?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-53160 being exploited?
There is no known exploitation of CVE-2026-53160 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53160, DEBIAN-CVE-2026-53160, GHSA-4wgj-8vww-9v4h, ROOT-OS-DEBIAN-12-CVE-2026-53160, ROOT-OS-UBUNTU-2404-CVE-2026-53160, UBUNTU-CVE-2026-53160.