---
id: CVE-2025-38212
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipc: fix to protect IPCS lookups using RCU

  syzbot reported that it discovered a use-after-free vulnerability, [0]

  [0]: https://lore.kernel.org/all/67af13f8.050a0220.2…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipc: fix to protect IPCS lookups using RCU

  syzbot reported that it discovered a use-after-free vulnerability, [0]

  [0]: https://lore.kernel.org/all/67af13f8.050a0220.2…
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 >= 3.1, < 5.4.295'
  - 'linux_kernel >= 5.5, < 5.10.239'
  - 'linux_kernel >= 5.11, < 5.15.186'
  - 'linux_kernel >= 5.16, < 6.1.142'
  - 'linux_kernel >= 6.2, < 6.6.95'
  - 'linux_kernel >= 6.7, < 6.12.35'
  - 'linux_kernel >= 6.13, < 6.15.4'
  - debian_linux = 11.0
patched:
  - linux_kernel 6.15.4
published: '2025-07-04'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T22:18:35.450'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-38212'
references:
  - url: 'https://git.kernel.org/stable/c/5180561afff8e0f029073c8c8117c95c6512d1f9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5f1e1573bf103303944fd7225559de5d8297539c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/68c173ea138b66d7dd1fd980c9bc578a18e11884'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/74bc813d11c30e28fc5261dc877cca662ccfac68'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/78297d53d3878d43c1d627d20cd09f611fa4b91d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b0b6bf90ce2699a574b3683e22c44d0dcdd7a057'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b968ba8bfd9f90914957bbbd815413bf6a98eca7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d66adabe91803ef34a8b90613c81267b5ded1472'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-082556.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00198
epssPercentile: 0.09522
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:48:35.362340Z'
ingestedAt: '2026-10-15T05:52:46.093Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

ipc: fix to protect IPCS lookups using RCU

syzbot reported that it discovered a use-after-free vulnerability, [0]

[0]: https://lore.kernel.org/all/67af13f8.050a0220.21dd3.0038.GAE@google.com/

idr_for_each() is protected by rwsem, but this is not enough.  If it is
not protected by RCU read-critical region, when idr_for_each() calls
radix_tree_node_free() through call_rcu() to free the radix_tree_node
structure, the node will be freed immediately, and when reading the next
node in radix_tree_for_each_slot(), the already freed memory may be read.

Therefore, we need to add code to make sure that idr_for_each() is
protected within the RCU read-critical region when we call it in
shm_destroy_orphaned().

## Affected

- `linux_kernel >= 3.1, < 5.4.295`
- `linux_kernel >= 5.5, < 5.10.239`
- `linux_kernel >= 5.11, < 5.15.186`
- `linux_kernel >= 5.16, < 6.1.142`
- `linux_kernel >= 6.2, < 6.6.95`
- `linux_kernel >= 6.7, < 6.12.35`
- `linux_kernel >= 6.13, < 6.15.4`
- `debian_linux = 11.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.15.4`