CVE-2026-74270
In the Linux kernel, the following vulnerability has been resolved: handshake: Require admin permission for DONE command ACCEPT and DONE are the two downcalls of the handshake genl family, both intended for use by the trusted handshake agent (tlshd). ACCEPT already requires GENL_ADMIN_PERM; DONE has no privilege check at all. The fd-lookup in handshake_nl_done_doit() only confirms that some pending handshake request exists for the supplied sockfd; it does not authenticate the sender. An unprivileged process that guesses or observes a valid sockfd can therefore submit a DONE with HANDSHAKE_A_DONE_STATUS == 0, leaving the kernel consumer to proceed as if the handshake succeeded. A non-zero status on a forged DONE tears down a legitimate in-flight handshake before tlshd can report its real result.
Affected versions
Linux kernel versions
6.4
and later are affected. Fixed in
6.6.145,
6.12.97,
6.18.40,
7.1.5,
7.2-rc1
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-74270?
CVE-2026-74270 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.4 onward and has been patched in 6.6.145, 6.12.97, 6.18.40 and others. CVE-2026-74270 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-74270?
Yes. CVE-2026-74270 has been patched. Fixed versions include 6.6.145, 6.12.97, 6.18.40 and others. If you are running Linux kernel 6.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-74270 actively exploited?
No. CVE-2026-74270 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.