CVE-2026-68137: linux
Vulnerability summary
CVE-2026-68137 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 28 · Related 26Timeline
- 10-08-2026PublishedVulnerability first disclosed.
- 19-08-2026Last modifiedVulnerability information updated.
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().
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.54%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
0.00 pp
From 0.54% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu169 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.6-1
- linux-6.12< 6.12.101-1~deb12u1
Linux1 product
- linux≥ 5c94b6205e87411dbe9dc1ca088eb36b8837fb47, < db6b04f6d65549bb1c7bc8e64a92e7b7d03be676 | ≥ 409570a619c1cda2e0fde6018a256b9e3d3ba0ee, < 5e8a754ac2009a88a7b99ab61eab6296eed360f3 | ≥ 7781607938c8371d4c2b243527430241c62e39c2, < c98a454d1a9e1bd09d5fd55a7aa589b199340b88 | ≥ 7781607938c8371d4c2b243527430241c62e39c2, < 3f4fe26c20c30bd5a2e2583e80685def0b27858c | ≥ 7781607938c8371d4c2b243527430241c62e39c2, < 610678d4be94b619c751572e8a58de705592cd07 | ≥ 7781607938c8371d4c2b243527430241c62e39c2, < ec6d91a1bf2ebd767d3d43f6d249ee0ed3f4558a | ≥ 7781607938c8371d4c2b243527430241c62e39c2, < 9aabda553184346f74810e2ee1d96920b4612e3f | ≥ 7781607938c8371d4c2b243527430241c62e39c2, < 5499e0602d2faafd42c580d25f615903c3fbe11b | dffc859d1d9560da594e4282091781b8d2715f00 | 858642789ada1b48630f322e59416ca9fca3e6b7 | 4c240c5a105557e4546d0836e694868f22fd09b0 | 9acf05b4e7b55fdb712ef7b331dbce5bcd391d0f | 4a279d7ee1c65411b4055ecd428b8aa2b1711c1f | 671529db75e6be777bb1c76aa07c2bdd2992be6d | ≥ 5.10.110, < 5.10.265 | ≥ 5.15.33, < 5.15.216 | ≥ 4.9.311, < 4.10 | ≥ 4.14.276, < 4.15 | ≥ 4.19.238, < 4.20 | ≥ 5.4.189, < 5.5 | ≥ 5.16.19, < 5.17 | ≥ 5.17.2, < 5.18 | 5.18
3 vendors · 172 products
