Is there a public exploit for CVE-2026-99270?

No public exploit for CVE-2026-99270 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-99270?

CVE-2026-99270 scores CVSS 8.1 (v3.1), rated high.

What does CVE-2026-99270 affect?

CVE-2026-99270 affects Linux Linux.

8.1 High

In the Linux kernel, the following vulnerability has been resolved: tcp: Fix potential UAF in reqsktimerhandler().

CVE-2026-99270

In the Linux kernel, the following vulnerability has been resolved: tcp: Fix potential UAF in reqsktimerhandler(). When TCP socket migration fails at inetehashinsert() in reqsktimerhandler(), we jump to the noownership: label and free the new reqsk immediately with reqskfree(). 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 timerdeletesync() for the new reqsk. Let's pass false to inetcskreqskqueuedrop() to stop the new reqsk's timer.

Assessment

CVSS: 8.1 (v3.1)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 3 November 2026
Last updated: 3 November 2026
Affected: Linux · Linux
Assigner: Linux

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

At the source

EUVD (ENISA)

References

https://git.kernel.org/stable/c/97c8a3c1f73d828de43a5a88e8a9a143efb2b661

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