---
id: CVE-2026-53160
title: |-
  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
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 call…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.1.156, < 6.1.176'
  - 'linux_kernel >= 6.6.112, < 6.6.143'
  - 'linux_kernel >= 6.12.53, < 6.12.94'
  - 'linux_kernel >= 6.17.3, < 6.18.36'
  - 'linux_kernel >= 6.19, < 7.0.13'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.13
published: '2026-06-25'
updated: '2026-07-06'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53160'
references:
  - url: 'https://git.kernel.org/stable/c/07ebe87915d8accdaba20c4f88c5ae430fe62fbb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0a3b87293fbd34fda651e6aead9964f84b893962'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5b0166112019d1dce30b976ab28fd67f7f0be532'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8b080c89183196fd3e49212f2a1a1c4a29335b9c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/992f121796b7ca83a5a8b93da24e971363206218'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f20f6512ecb75c816e0debf4551a138f098615c4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00126
epssPercentile: 0.01911
ingestedAt: '2026-07-06T17:44:51.365Z'
---

## Overview

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

- `linux_kernel >= 6.1.156, < 6.1.176`
- `linux_kernel >= 6.6.112, < 6.6.143`
- `linux_kernel >= 6.12.53, < 6.12.94`
- `linux_kernel >= 6.17.3, < 6.18.36`
- `linux_kernel >= 6.19, < 7.0.13`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.13`