CVE-2026-68137net/x25: fix use-after-free in x25_kill_by_neigh()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: net/x25: fix use-after-free in x25_kill_by_neigh() x25_kill_by_neigh() walks the global X.25 socket list looking for sockets attached to a terminating neighbour. x25_list_lock protects list membership while the lookup is in progress, but it does not pin a socket's lifetime after the lock is dropped. The function currently drops x25_list_lock before calling lock_sock(s). A concurrent close can run x25_release(), remove the same socket from x25_list, and drop the last socket reference in that window. The neighbour teardown path can then lock or inspect a freed struct sock/struct x25_sock. Take sock_hold(s) while x25_list_lock still proves that the list entry is live, then drop the temporary reference after the socket has been locked, rechecked, and released. Recheck x25_sk(s)->neighbour after lock_sock(), because another path may have disconnected the socket before this path acquired the socket lock. Restart the list walk after each disconnect because the list lock was dropped and the previous iterator state may no longer be valid. A QEMU/KASAN run against origin/master reproduced a slab-use-after-free in x25_kill_by_neigh().
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 5c94b6205e87411dbe9dc1ca088eb36b8837fb47 before db6b04f6d65549bb1c7bc8e64a92e7b7d03be676; 409570a619c1cda2e0fde6018a256b9e3d3ba0ee builds before 5e8a754ac2009a88a7b99ab61eab6296eed360f3; from 7781607938c8371d4c2b243527430241c62e39c2 before c98a454d1a9e1bd09d5fd55a7aa589b199340b88; 7781607938c8371d4c2b243527430241c62e39c2 builds before 3f4fe26c20c30bd5a2e2583e80685def0b27858c; 7781607938c8371d4c2b243527430241c62e39c2 builds before 610678d4be94b619c751572e8a58de705592cd07; from 7781607938c8371d4c2b243527430241c62e39c2 before ec6d91a1bf2ebd767d3d43f6d249ee0ed3f4558a; 7781607938c8371d4c2b243527430241c62e39c2 builds before 9aabda553184346f74810e2ee1d96920b4612e3f; 7781607938c8371d4c2b243527430241c62e39c2 builds before 5499e0602d2faafd42c580d25f615903c3fbe11b; and 14 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/db6b04f6d65549bb1c7bc8e64a92e7b7d03be676
- https://git.kernel.org/stable/c/5e8a754ac2009a88a7b99ab61eab6296eed360f3
- https://git.kernel.org/stable/c/c98a454d1a9e1bd09d5fd55a7aa589b199340b88
- https://git.kernel.org/stable/c/3f4fe26c20c30bd5a2e2583e80685def0b27858c
- https://git.kernel.org/stable/c/610678d4be94b619c751572e8a58de705592cd07
- https://git.kernel.org/stable/c/ec6d91a1bf2ebd767d3d43f6d249ee0ed3f4558a
- https://git.kernel.org/stable/c/9aabda553184346f74810e2ee1d96920b4612e3f
- https://git.kernel.org/stable/c/5499e0602d2faafd42c580d25f615903c3fbe11b
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.