---
id: CVE-2026-68144
title: 'phonet: pep: fix use-after-free in pep_get_sb()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  phonet: pep: fix use-after-free in pep_get_sb()

  pep_get_sb() doesn't consider that pskb_may_pull() might have relocated
  the skb data, and continue to access the older …
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 <
    c4a52cb4da8d57d060b1d52085d25147a238dac2
  - >-
    Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 <
    df198743859fefba2f824115f8151dd62d7ad6d8
  - >-
    Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 <
    1d81e19fc57a5ee55b4497d01bc0510d76fb9578
  - >-
    Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 <
    8d931a75a38b9bb584a4071f5ebbd52755fc35ee
  - >-
    Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 <
    17f78c0c0d41d738ee236eb6e841e39395188054
  - >-
    Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 <
    a48a889b60f73edb0399a8b08284a2ab0bd0295f
  - >-
    Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 <
    25e3641beb51333bfbb155af2fd2573a61113af2
  - >-
    Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 <
    0f71f852a96af9685858ce59fda34ecbf85c283d
  - Linux 2.6.28
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-16T15:44:46.818096Z'
published: '2026-08-10'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:52:59.934Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68144'
references:
  - url: 'https://git.kernel.org/stable/c/c4a52cb4da8d57d060b1d52085d25147a238dac2'
  - url: 'https://git.kernel.org/stable/c/df198743859fefba2f824115f8151dd62d7ad6d8'
  - url: 'https://git.kernel.org/stable/c/1d81e19fc57a5ee55b4497d01bc0510d76fb9578'
  - url: 'https://git.kernel.org/stable/c/8d931a75a38b9bb584a4071f5ebbd52755fc35ee'
  - url: 'https://git.kernel.org/stable/c/17f78c0c0d41d738ee236eb6e841e39395188054'
  - url: 'https://git.kernel.org/stable/c/a48a889b60f73edb0399a8b08284a2ab0bd0295f'
  - url: 'https://git.kernel.org/stable/c/25e3641beb51333bfbb155af2fd2573a61113af2'
  - url: 'https://git.kernel.org/stable/c/0f71f852a96af9685858ce59fda34ecbf85c283d'
tags:
  - cve.org
epss: 0.00536
epssPercentile: 0.43957
ingestedAt: '2026-10-16T17:24:46.844Z'
---

## Overview

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

phonet: pep: fix use-after-free in pep_get_sb()

pep_get_sb() doesn't consider that pskb_may_pull() might have relocated
the skb data, and continue to access the older pointer, causing UAF.

Reproduced under KASAN:

  BUG: KASAN: slab-use-after-free in pep_get_sb+0x234/0x3b0
  Read of size 1 at addr ff11000105510f50 by task repro/157
   pep_get_sb+0x234/0x3b0
   pipe_handler_do_rcv+0x5f7/0xa10
   pep_do_rcv+0x203/0x410
   __sk_receive_skb+0x471/0x4a0
   phonet_rcv+0x5b3/0x6c0
   __netif_receive_skb+0xcc/0x1d0

Refetch the header with skb_header_pointer() after pskb_may_pull(), so
the possibly stale pointer is no longer dereferenced. There are better
ways to solve this, but, this is the less instrusive one.

## Affected

- `Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 < c4a52cb4da8d57d060b1d52085d25147a238dac2`
- `Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 < df198743859fefba2f824115f8151dd62d7ad6d8`
- `Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 < 1d81e19fc57a5ee55b4497d01bc0510d76fb9578`
- `Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 < 8d931a75a38b9bb584a4071f5ebbd52755fc35ee`
- `Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 < 17f78c0c0d41d738ee236eb6e841e39395188054`
- `Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 < a48a889b60f73edb0399a8b08284a2ab0bd0295f`
- `Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 < 25e3641beb51333bfbb155af2fd2573a61113af2`
- `Linux >= 9641458d3ec42def729fde64669abf07f3220cd5 < 0f71f852a96af9685858ce59fda34ecbf85c283d`
- `Linux 2.6.28`

## Remediation

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