Kernel crash or code execution via X.25 race
Published Aug 10, 2026 · Updated Aug 10, 2026
Use-after-free in Linux X.25 networking allows remote attackers to crash the kernel or execute code via crafted link-control traffic. x25_kill_by_neigh() drops x25_list_lock without retaining a socket reference, letting concurrent x25_release() processing free the socket before lock_sock() or later inspection. Reachability requires an X.25 interface and a socket close racing neighbor teardown; successful reuse corrupts kernel memory, while controlled testing reproduced a slab use-after-free.
Summary
What happened
Use-after-free in Linux X.25 networking allows remote attackers to crash the kernel or execute code via crafted link-control traffic. x25_kill_by_neigh() drops x25_list_lock without retaining a socket reference, letting concurrent x25_release() processing free the socket before lock_sock() or later inspection. Reachability requires an X.25 interface and a socket close racing neighbor teardown; successful reuse corrupts kernel memory, while controlled testing reproduced a slab use-after-free.
The record
- CVE
- CVE-2026-68137
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-825, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 10, 2026CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=409570a619c1cda2e0fde6018a256b9e3d3ba0ee
- Affected versionversion=4.14.276 <4.15
- Affected versionversion=4.19.238 <4.20
- Affected versionversion=4.9.311 <4.10
- Affected versionversion=4a279d7ee1c65411b4055ecd428b8aa2b1711c1f
- Affected versionversion=4c240c5a105557e4546d0836e694868f22fd09b0
- Affected versionversion=5.10.110 <5.11
- Affected versionversion=5.15.33 <5.16
- Affected versionversion=5.16.19 <5.17
- Affected versionversion=5.17.2 <5.18
- Affected versionversion=5.18
- Affected versionversion=5.4.189 <5.5
- Affected versionversion=5c94b6205e87411dbe9dc1ca088eb36b8837fb47
- Affected versionversion=671529db75e6be777bb1c76aa07c2bdd2992be6d
- Affected versionversion=7781607938c8371d4c2b243527430241c62e39c2 <3f4fe26c20c30bd5a2e2583e80685def0b27858c
- Affected versionversion=7781607938c8371d4c2b243527430241c62e39c2 <5499e0602d2faafd42c580d25f615903c3fbe11b
- Affected versionversion=7781607938c8371d4c2b243527430241c62e39c2 <610678d4be94b619c751572e8a58de705592cd07
- Affected versionversion=7781607938c8371d4c2b243527430241c62e39c2 <9aabda553184346f74810e2ee1d96920b4612e3f
- Affected versionversion=7781607938c8371d4c2b243527430241c62e39c2 <ec6d91a1bf2ebd767d3d43f6d249ee0ed3f4558a
- Affected versionversion=858642789ada1b48630f322e59416ca9fca3e6b7
- Affected versionversion=9acf05b4e7b55fdb712ef7b331dbce5bcd391d0f
- Affected versionversion=dffc859d1d9560da594e4282091781b8d2715f00
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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