CVE-2026-74270handshake: Require admin permission for DONE command
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 3b3009ea8abb713b022d94fba95ec270cf6e7eae before 25fb53e43ec006ac69b9e825a7e8a11d63a6083e; from 3b3009ea8abb713b022d94fba95ec270cf6e7eae before b6557f912509abe8e70223373dd7a44d1d4a0d6c; from 3b3009ea8abb713b022d94fba95ec270cf6e7eae before 67cec2f1eb9e58719d622e92e2278ceda72dbd85; from 3b3009ea8abb713b022d94fba95ec270cf6e7eae before 4dafc411948469277b276724c3b2b4408c02c04c; from 3b3009ea8abb713b022d94fba95ec270cf6e7eae before 81246a65303d9635266b1334490142caaf86a11f | CNA record |
References
- https://git.kernel.org/stable/c/25fb53e43ec006ac69b9e825a7e8a11d63a6083e
- https://git.kernel.org/stable/c/b6557f912509abe8e70223373dd7a44d1d4a0d6c
- https://git.kernel.org/stable/c/67cec2f1eb9e58719d622e92e2278ceda72dbd85
- https://git.kernel.org/stable/c/4dafc411948469277b276724c3b2b4408c02c04c
- https://git.kernel.org/stable/c/81246a65303d9635266b1334490142caaf86a11f
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.