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.
CVSS breakdown
CVSS 3.1
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Linux / Linux0b70ec82b309a4093106ff399da1911ad23b52d3 – 0a3b87293fbd34fda651e6aead9964f84b893962
- Linux / Linuxd7513b47082c08105e837b06cebeb3f07a5fa56f – 8b080c89183196fd3e49212f2a1a1c4a29335b9c
- Linux / Linux802359a52676176b18713e33caa17572ad009057 – 5b0166112019d1dce30b976ab28fd67f7f0be532
- Linux / Linux10df039834f84a297c72ec962c0f9b7c8c5ca31a – 992f121796b7ca83a5a8b93da24e971363206218
- Linux / Linux10df039834f84a297c72ec962c0f9b7c8c5ca31a – f20f6512ecb75c816e0debf4551a138f098615c4
- Linux / Linux10df039834f84a297c72ec962c0f9b7c8c5ca31a – 07ebe87915d8accdaba20c4f88c5ae430fe62fbb
- Linux / Linuxf3f59bab68e9bc714f757ab22f3fb36153014043 – f3f59bab68e9bc714f757ab22f3fb36153014043
- Linux / Linux6.1.156 – 6.1.176
- Linux / Linux6.6.112 – 6.6.143
- Linux / Linux6.12.53 – 6.12.94
- Linux / Linux6.17.3 – 6.18
- Linux / Linux6.18 – 6.18
- Linux / Linux0 – 6.18
- Linux / Linux6.1.176 – 6.1.*
- Linux / Linux6.6.143 – 6.6.*
- Linux / Linux6.12.94 – 6.12.*
- Linux / Linux6.18.36 – 6.18.*
- Linux / Linux7.0.13 – 7.0.*
- Linux / Linux7.1 – *
References
- MISChttps://git.kernel.org/stable/c/0a3b87293fbd34fda651e6aead9964f84b893962
- MISChttps://git.kernel.org/stable/c/8b080c89183196fd3e49212f2a1a1c4a29335b9c
- MISChttps://git.kernel.org/stable/c/5b0166112019d1dce30b976ab28fd67f7f0be532
- MISChttps://git.kernel.org/stable/c/992f121796b7ca83a5a8b93da24e971363206218
- MISChttps://git.kernel.org/stable/c/f20f6512ecb75c816e0debf4551a138f098615c4
- MISChttps://git.kernel.org/stable/c/07ebe87915d8accdaba20c4f88c5ae430fe62fbb