CVE-2026-53160
Published: June 27, 2026Last modified: July 6, 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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.177-r0) |
| 25 LTS | linux-lts | Fixed (6.12.95-r0) | |
| Stream | linux-lts | Fixed (6.18.38-r0) |
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
- https://git.kernel.org/stable/c/f20f6512ecb75c816e0debf4551a138f098615c4