---
id: CVE-2026-52928
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  af_unix: Reject SIOCATMARK on non-stream sockets

  SIOCATMARK reports whether the receive queue is at the urgent mark for
  MSG_OOB.

  In AF_UNIX, MSG_OOB is supported only…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  af_unix: Reject SIOCATMARK on non-stream sockets

  SIOCATMARK reports whether the receive queue is at the urgent mark for
  MSG_OOB.

  In AF_UNIX, MSG_OOB is supported only…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.15, < 5.15.211'
  - 'linux_kernel >= 5.16, < 6.1.177'
  - 'linux_kernel >= 6.2, < 6.6.144'
  - 'linux_kernel >= 6.7, < 6.12.88'
  - 'linux_kernel >= 6.13, < 6.18.30'
  - 'linux_kernel >= 6.19, < 7.0.7'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.7
published: '2026-06-24'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:19:57.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-52928'
references:
  - url: 'https://git.kernel.org/stable/c/3147ddf5a41c20c45c2eb69e00b62f10f822056a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/645b1ed3259af38b7814242a420bc2081bdd1eb6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b741c9c6ef59f17c1f104ddf1217ef77f79ed29b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c34c41446acf6c0d13b5b06c809be11e0f7f2729'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d119775f2bad827edc28071c061fdd4a91f889a5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ec123873fdc83e7244c8ed6d17b8f8ea6c416a67'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f085971de6d6b8ef946a5e0bcd73ff24509a0f85'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-784472.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00114
epssPercentile: 0.01486
ingestedAt: '2026-07-04T12:56:09.609Z'
---

## Overview

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

af_unix: Reject SIOCATMARK on non-stream sockets

SIOCATMARK reports whether the receive queue is at the urgent mark for
MSG_OOB.

In AF_UNIX, MSG_OOB is supported only for SOCK_STREAM sockets.
SOCK_DGRAM and SOCK_SEQPACKET reject MSG_OOB in sendmsg() and recvmsg(),
so they should not support SIOCATMARK either.

Return -EOPNOTSUPP for non-stream sockets before checking the receive
queue.

## Affected

- `linux_kernel >= 5.15, < 5.15.211`
- `linux_kernel >= 5.16, < 6.1.177`
- `linux_kernel >= 6.2, < 6.6.144`
- `linux_kernel >= 6.7, < 6.12.88`
- `linux_kernel >= 6.13, < 6.18.30`
- `linux_kernel >= 6.19, < 7.0.7`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.7`