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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-68137 Detail

Description

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().


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/3f4fe26c20c30bd5a2e2583e80685def0b27858c kernel.org
https://git.kernel.org/stable/c/5499e0602d2faafd42c580d25f615903c3fbe11b kernel.org
https://git.kernel.org/stable/c/5e8a754ac2009a88a7b99ab61eab6296eed360f3 kernel.org
https://git.kernel.org/stable/c/610678d4be94b619c751572e8a58de705592cd07 kernel.org
https://git.kernel.org/stable/c/9aabda553184346f74810e2ee1d96920b4612e3f kernel.org
https://git.kernel.org/stable/c/c98a454d1a9e1bd09d5fd55a7aa589b199340b88 kernel.org
https://git.kernel.org/stable/c/db6b04f6d65549bb1c7bc8e64a92e7b7d03be676 kernel.org
https://git.kernel.org/stable/c/ec6d91a1bf2ebd767d3d43f6d249ee0ed3f4558a kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-68137
NVD Published Date:
08/10/2026
NVD Last Modified:
08/19/2026
Source:
kernel.org