PT-2026-52256 · Linux · Linux

Published 2026-06-25 · Updated 2026-06-25 · CVE-2026-53160

Mitre

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.

Related Identifiers

CVE-2026-53160

Affected Products

Linux

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-53160 · Security Note
• https://git.kernel.org/stable/c/8b080c89183196fd3e49212f2a1a1c4a29335b9c · Note
• https://git.kernel.org/stable/c/5b0166112019d1dce30b976ab28fd67f7f0be532 · Note
• https://git.kernel.org/stable/c/07ebe87915d8accdaba20c4f88c5ae430fe62fbb · Note
• https://git.kernel.org/stable/c/f20f6512ecb75c816e0debf4551a138f098615c4 · Note
• https://git.kernel.org/stable/c/992f121796b7ca83a5a8b93da24e971363206218 · Note
• https://git.kernel.org/stable/c/0a3b87293fbd34fda651e6aead9964f84b893962 · Note