CVE-2026-68144

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

State: Published
Severity: 9.8 Critical
Published: Aug 10, 2026
Updated: Oct 19, 2026
Reserved: Jul 30, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	9641458d3ec42def729fde64669abf07f3220cd5 to before c4a52cb4da8d57d060b1d52085d25147a238dac2Affected 9641458d3ec42def729fde64669abf07f3220cd5 to before df198743859fefba2f824115f8151dd62d7ad6d8Affected 9641458d3ec42def729fde64669abf07f3220cd5 to before 1d81e19fc57a5ee55b4497d01bc0510d76fb9578Affected 9641458d3ec42def729fde64669abf07f3220cd5 to before 8d931a75a38b9bb584a4071f5ebbd52755fc35eeAffected 9641458d3ec42def729fde64669abf07f3220cd5 to before 17f78c0c0d41d738ee236eb6e841e39395188054Affected 9641458d3ec42def729fde64669abf07f3220cd5 to before a48a889b60f73edb0399a8b08284a2ab0bd0295fAffected 9641458d3ec42def729fde64669abf07f3220cd5 to before 25e3641beb51333bfbb155af2fd2573a61113af2Affected 9641458d3ec42def729fde64669abf07f3220cd5 to before 0f71f852a96af9685858ce59fda34ecbf85c283dAffected
LinuxLinux	2.6.28Affected before 2.6.28Not affected 5.10.265 through 5.10.Not affected 5.15.216 through 5.15.Not affected 6.1.183 through 6.1.Not affected 6.6.148 through 6.6.Not affected 6.12.101 through 6.12.Not affected 6.18.42 through 6.18.Not affected 7.1.6 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

9641458d3ec42def729fde64669abf07f3220cd5 to before c4a52cb4da8d57d060b1d52085d25147a238dac2Affected
9641458d3ec42def729fde64669abf07f3220cd5 to before df198743859fefba2f824115f8151dd62d7ad6d8Affected
9641458d3ec42def729fde64669abf07f3220cd5 to before 1d81e19fc57a5ee55b4497d01bc0510d76fb9578Affected
9641458d3ec42def729fde64669abf07f3220cd5 to before 8d931a75a38b9bb584a4071f5ebbd52755fc35eeAffected
9641458d3ec42def729fde64669abf07f3220cd5 to before 17f78c0c0d41d738ee236eb6e841e39395188054Affected
9641458d3ec42def729fde64669abf07f3220cd5 to before a48a889b60f73edb0399a8b08284a2ab0bd0295fAffected
9641458d3ec42def729fde64669abf07f3220cd5 to before 25e3641beb51333bfbb155af2fd2573a61113af2Affected
9641458d3ec42def729fde64669abf07f3220cd5 to before 0f71f852a96af9685858ce59fda34ecbf85c283dAffected

LinuxLinux

2.6.28Affected
before 2.6.28Not affected
5.10.265 through 5.10.*Not affected
5.15.216 through 5.15.*Not affected
6.1.183 through 6.1.*Not affected
6.6.148 through 6.6.*Not affected
6.12.101 through 6.12.*Not affected
6.18.42 through 6.18.*Not affected
7.1.6 through 7.1.*Not affected
7.2 and laterNot affected

References

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