CVE-2026-53160

misc: fastrpc: fix use-after-free race in fastrpc_map_create

State: Published
Severity: 7.8 High
Published: Jun 25, 2026
Updated: Aug 5, 2026
Reserved: Jun 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	0b70ec82b309a4093106ff399da1911ad23b52d3 to before 0a3b87293fbd34fda651e6aead9964f84b893962Affected d7513b47082c08105e837b06cebeb3f07a5fa56f to before 8b080c89183196fd3e49212f2a1a1c4a29335b9cAffected 802359a52676176b18713e33caa17572ad009057 to before 5b0166112019d1dce30b976ab28fd67f7f0be532Affected 10df039834f84a297c72ec962c0f9b7c8c5ca31a to before 992f121796b7ca83a5a8b93da24e971363206218Affected 10df039834f84a297c72ec962c0f9b7c8c5ca31a to before f20f6512ecb75c816e0debf4551a138f098615c4Affected 10df039834f84a297c72ec962c0f9b7c8c5ca31a to before 07ebe87915d8accdaba20c4f88c5ae430fe62fbbAffected f3f59bab68e9bc714f757ab22f3fb36153014043Affected 6.1.156 to before 6.1.176Affected 6.6.112 to before 6.6.143Affected 6.12.53 to before 6.12.94Affected 6.17.3 to before 6.18Affected
LinuxLinux	6.18Affected before 6.18Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

0b70ec82b309a4093106ff399da1911ad23b52d3 to before 0a3b87293fbd34fda651e6aead9964f84b893962Affected
d7513b47082c08105e837b06cebeb3f07a5fa56f to before 8b080c89183196fd3e49212f2a1a1c4a29335b9cAffected
802359a52676176b18713e33caa17572ad009057 to before 5b0166112019d1dce30b976ab28fd67f7f0be532Affected
10df039834f84a297c72ec962c0f9b7c8c5ca31a to before 992f121796b7ca83a5a8b93da24e971363206218Affected
10df039834f84a297c72ec962c0f9b7c8c5ca31a to before f20f6512ecb75c816e0debf4551a138f098615c4Affected
10df039834f84a297c72ec962c0f9b7c8c5ca31a to before 07ebe87915d8accdaba20c4f88c5ae430fe62fbbAffected
f3f59bab68e9bc714f757ab22f3fb36153014043Affected
6.1.156 to before 6.1.176Affected
6.6.112 to before 6.6.143Affected
6.12.53 to before 6.12.94Affected
6.17.3 to before 6.18Affected

LinuxLinux

6.18Affected
before 6.18Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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