CVE-2026-53160

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.

References

• 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