CVE-2026-53160

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux0b70ec82b309a4093106ff399da1911ad23b52d3 < 0a3b87293fbd34fda651e6aead9964f84b893962affected
LinuxLinuxd7513b47082c08105e837b06cebeb3f07a5fa56f < 8b080c89183196fd3e49212f2a1a1c4a29335b9caffected
LinuxLinux802359a52676176b18713e33caa17572ad009057 < 5b0166112019d1dce30b976ab28fd67f7f0be532affected
LinuxLinux10df039834f84a297c72ec962c0f9b7c8c5ca31a < 992f121796b7ca83a5a8b93da24e971363206218affected
LinuxLinux10df039834f84a297c72ec962c0f9b7c8c5ca31a < f20f6512ecb75c816e0debf4551a138f098615c4affected
LinuxLinux10df039834f84a297c72ec962c0f9b7c8c5ca31a < 07ebe87915d8accdaba20c4f88c5ae430fe62fbbaffected
LinuxLinuxf3f59bab68e9bc714f757ab22f3fb36153014043affected
LinuxLinux6.1.156 < 6.1.176affected
LinuxLinux6.6.112 < 6.6.143affected
LinuxLinux6.12.53 < 6.12.94affected
LinuxLinux6.17.3 < 6.18affected
LinuxLinux6.18affected
LinuxLinux0 < 6.18unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References