CVE-2026-53160: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 6.1.156, before 6.1.176 (fixed in 6.1.176); from 6.6.112, before 6.6.143 (fixed in 6.6.143); from 6.12.53, before 6.12.94 (fixed in 6.12.94); from 6.17.3, before 6.18.36 (fixed in 6.18.36); from 6.19, before 7.0.13 (fixed in 7.0.13); version 7.1 only

Published 2026-06-25. Last modified 2026-07-06.