---
id: CVE-2026-98394
title: >-
  In the Linux kernel, the following vulnerability has been resolved:


  af_unix: Return immediately when manage_oob() returns NULL for 0-length
  buffer.


  Fahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait

  in unix_stream_read_ge…
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  af_unix: Return immediately when manage_oob() returns NULL for 0-length
  buffer.


  Fahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait

  in unix_stream_read_ge…
severity: medium
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T14:17:50.300'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98394'
references:
  - url: 'https://git.kernel.org/stable/c/3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6e5ee08eb5858d175da6768d75d163817b6a9d4a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c81c5be3826c8467945b964d0cf7f7b3d65461db'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d5dd55b316ca229a4cbf11729483ba5bb57233e7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98394.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98394'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2552217'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98394'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98394'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98394.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-10-14T15:36:13.978Z'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 314001f0bf927015e459c9d387d62a231fe93af3 <
    3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713
  - >-
    Linux >= 314001f0bf927015e459c9d387d62a231fe93af3 <
    d5dd55b316ca229a4cbf11729483ba5bb57233e7
  - >-
    Linux >= 314001f0bf927015e459c9d387d62a231fe93af3 <
    c81c5be3826c8467945b964d0cf7f7b3d65461db
  - >-
    Linux >= 314001f0bf927015e459c9d387d62a231fe93af3 <
    6e5ee08eb5858d175da6768d75d163817b6a9d4a
  - Linux 5.15
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-835
epss: 0.002
epssPercentile: 0.09771
---

## Overview

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

af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.

Fahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait
in unix_stream_read_generic() if recv() is blocking and the last
skb in the queue is MSG_OOB skb.

In such a situation, TCP returns 0 immediately regardless of
blocking or non-blocking.

Let's follow the behaviour.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10 · updated 2026-10-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98394.json)