---
id: CVE-2023-4622
title: >-
  A use-after-free vulnerability in the Linux kernel's af_unix component can be
  exploited to achieve local privilege escalation.




  The unix_stream_sendpage() function tries to add data to the last skb in the
  peer's recv queue without lock…
summary: >-
  A use-after-free vulnerability in the Linux kernel's af_unix component can be
  exploited to achieve local privilege escalation.




  The unix_stream_sendpage() function tries to add data to the last skb in the
  peer's recv queue without lock…
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 >= 4.2, < 4.14.324'
  - 'linux_kernel >= 4.15, < 4.19.293'
  - 'linux_kernel >= 4.20, < 5.4.255'
  - 'linux_kernel >= 5.5, < 5.10.192'
  - 'linux_kernel >= 5.11, < 5.15.128'
  - 'linux_kernel >= 5.16, < 6.1.47'
  - 'linux_kernel >= 6.2, < 6.4.12'
  - debian_linux = 10.0
  - debian_linux = 12.0
patched:
  - linux_kernel 6.4.12
published: '2023-09-06'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T20:16:47.693'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-4622'
references:
  - url: >-
      http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
    label: cve-coordination@google.com
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.1.y&id=790c2f9d15b594350ae9bca7b236f2b1859de02c
    label: cve-coordination@google.com
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4821df2ffe38d629170edc266e65fa05970e0745
    label: cve-coordination@google.com
  - url: 'https://kernel.dance/790c2f9d15b594350ae9bca7b236f2b1859de02c'
    label: cve-coordination@google.com
  - url: 'https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html'
    label: cve-coordination@google.com
  - url: 'https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html'
    label: cve-coordination@google.com
  - url: 'https://www.debian.org/security/2023/dsa-5492'
    label: cve-coordination@google.com
  - url: >-
      http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-6.1.y&id=790c2f9d15b594350ae9bca7b236f2b1859de02c
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://kernel.dance/790c2f9d15b594350ae9bca7b236f2b1859de02c'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2023/dsa-5492'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00613
epssPercentile: 0.48054
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/0range1337/CVE-CVE-2023-4622'
  checkedAt: '2026-09-24T07:52:50.129Z'
exploitAvailable: true
ingestedAt: '2026-09-13T17:07:12.872Z'
---

## Overview

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation.



The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.



We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c (or backported equivalents).

## Affected

- `linux_kernel >= 4.2, < 4.14.324`
- `linux_kernel >= 4.15, < 4.19.293`
- `linux_kernel >= 4.20, < 5.4.255`
- `linux_kernel >= 5.5, < 5.10.192`
- `linux_kernel >= 5.11, < 5.15.128`
- `linux_kernel >= 5.16, < 6.1.47`
- `linux_kernel >= 6.2, < 6.4.12`
- `debian_linux = 10.0`
- `debian_linux = 12.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.4.12`