---
id: CVE-2026-81001
title: 'kernel: slip: fix use-after-free in sl_sync() (CVE-2026-81001)'
summary: >-
  A flaw was found in the Linux kernel's Serial Line Internet Protocol (SLIP)
  driver. A race condition in the `sl_sync()` function allows for a
  use-after-free vulnerability, where the driver attempts to access a network
  device pointer after …
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-825
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:35:44+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81001.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81001.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-81001'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532250'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-81001'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81001'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-81001.mbox
  - url: 'https://git.kernel.org/stable/c/045e307ac21fbd735b789d8817b21be4d8ead054'
  - url: 'https://git.kernel.org/stable/c/87398cdec8bdf84096a8af4dbccdb04f1972f32c'
  - url: 'https://git.kernel.org/stable/c/e93ace1f46177a4f7b5a8e5996606cdf77e1e890'
  - url: 'https://git.kernel.org/stable/c/70e20456bcbf7f3ae145bb96e5548f827a37c640'
  - url: 'https://git.kernel.org/stable/c/a235b20972bbd98ca1fb127d6269434edc607f19'
  - url: 'https://git.kernel.org/stable/c/486577db807891d0f964fdf13c1640c7f54b0ad1'
  - url: 'https://git.kernel.org/stable/c/d6f25e5bd777b05880da8673daf74a8419480545'
  - url: 'https://git.kernel.org/stable/c/2c4e7c42d77e78ad595dbb9e4b5886b58b45d89d'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00171
epssPercentile: 0.05724
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.454Z'
---

## Overview

A flaw was found in the Linux kernel's Serial Line Internet Protocol (SLIP) driver. A race condition in the `sl_sync()` function allows for a use-after-free vulnerability, where the driver attempts to access a network device pointer after it has been freed. A local attacker could exploit this to cause a denial of service, leading to a system crash.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81001.json)

**kernel: slip: fix use-after-free in sl_sync()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6

## Remediation

Affected