CVE-2026-68144

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 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 Software

VendorProductVersion RangeStatus
LinuxLinux9641458d3ec42def729fde64669abf07f3220cd5 < c4a52cb4da8d57d060b1d52085d25147a238dac2affected
LinuxLinux9641458d3ec42def729fde64669abf07f3220cd5 < df198743859fefba2f824115f8151dd62d7ad6d8affected
LinuxLinux9641458d3ec42def729fde64669abf07f3220cd5 < 1d81e19fc57a5ee55b4497d01bc0510d76fb9578affected
LinuxLinux9641458d3ec42def729fde64669abf07f3220cd5 < 8d931a75a38b9bb584a4071f5ebbd52755fc35eeaffected
LinuxLinux9641458d3ec42def729fde64669abf07f3220cd5 < 17f78c0c0d41d738ee236eb6e841e39395188054affected
LinuxLinux9641458d3ec42def729fde64669abf07f3220cd5 < a48a889b60f73edb0399a8b08284a2ab0bd0295faffected
LinuxLinux9641458d3ec42def729fde64669abf07f3220cd5 < 25e3641beb51333bfbb155af2fd2573a61113af2affected
LinuxLinux9641458d3ec42def729fde64669abf07f3220cd5 < 0f71f852a96af9685858ce59fda34ecbf85c283daffected
LinuxLinux2.6.28affected
LinuxLinux0 < 2.6.28unaffected
LinuxLinux5.10.265 <= 5.10.*unaffected
LinuxLinux5.15.216 <= 5.15.*unaffected
LinuxLinux6.1.183 <= 6.1.*unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References