CVE-2026-99270
tcp: Fix potential UAF in reqsk_timer_handler().
In the Linux kernel, the following vulnerability has been resolved: tcp: Fix potential UAF in reqsk_timer_handler(). When TCP socket migration fails at inet_ehash_insert() in reqsk_timer_handler(), we jump to the no_ownership: label and free the new reqsk immediately with __reqsk_free(). Thus, we must stop the new reqsk's timer before jumping to the label, but the timer might be missed since the cited commit, resulting in UAF. As we are in the original reqsk's timer context, we can safely call timer_delete_sync() for the new reqsk. Let's pass false to __inet_csk_reqsk_queue_drop() to stop the new reqsk's timer.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 83fccfc3940c4a2db90fd7e7079f5b465cd8c6af; < 97c8a3c1f73d828de43a5a88e8a9a143efb2b661 (affected, git) d3a1196bfc462943694623412d8e03aaf172bdc1 (affected, git) ≥ 4.1.11; < 4.2 (affected, semver) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
4.2 (affected) ≥ 0; < 4.2 (unaffected, semver) ≥ 7.1; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
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