---
id: CVE-2023-1281
title: "Use After Free vulnerability in Linux kernel traffic control index filter (tcindex) allows Privilege Escalation.\_The imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when 'tcf_exts_exec()…"
summary: "Use After Free vulnerability in Linux kernel traffic control index filter (tcindex) allows Privilege Escalation.\_The imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when 'tcf_exts_exec()…"
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
  - CWE-416
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 4.14, < 5.10.169'
  - 'linux_kernel >= 5.11, < 5.15.95'
  - 'linux_kernel >= 5.16, < 6.1.13'
  - linux_kernel = 6.2
patched:
  - linux_kernel 6.1.13
published: '2023-03-22'
updated: '2026-07-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-1281'
references:
  - url: 'http://www.openwall.com/lists/oss-security/2023/04/11/3'
    label: cve-coordination@google.com
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ee059170b1f7e94e55fa6cadee544e176a6e59c2
    label: cve-coordination@google.com
  - url: 'https://kernel.dance/#ee059170b1f7e94e55fa6cadee544e176a6e59c2'
    label: cve-coordination@google.com
  - url: 'https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html'
    label: cve-coordination@google.com
  - url: 'https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html'
    label: cve-coordination@google.com
  - url: 'https://security.netapp.com/advisory/ntap-20230427-0004/'
    label: cve-coordination@google.com
  - url: 'http://www.openwall.com/lists/oss-security/2023/04/11/3'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ee059170b1f7e94e55fa6cadee544e176a6e59c2
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://kernel.dance/#ee059170b1f7e94e55fa6cadee544e176a6e59c2'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/05/msg00005.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20230427-0004/'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - exploit-available
epss: 0.00304
epssPercentile: 0.20693
ingestedAt: '2026-07-30T17:54:54.454Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/lanleft/CVE-2023-1281'
  checkedAt: '2026-09-26T09:05:29.540Z'
exploitAvailable: true
---

## Overview

Use After Free vulnerability in Linux kernel traffic control index filter (tcindex) allows Privilege Escalation. The imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when 'tcf_exts_exec()' is called with the destroyed tcf_ext. A local attacker user can use this vulnerability to elevate its privileges to root.


This issue affects Linux Kernel: from 4.14 before git commit ee059170b1f7e94e55fa6cadee544e176a6e59c2.

## Affected

- `linux_kernel >= 4.14, < 5.10.169`
- `linux_kernel >= 5.11, < 5.15.95`
- `linux_kernel >= 5.16, < 6.1.13`
- `linux_kernel = 6.2`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.1.13`