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CVE-2026-74270

7.8 · HIGH

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 i…

Published Aug 15, 2026EPSS 0.18%

Overview

CVE-2026-74270 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/25fb53e43ec006ac69b9e825a7e8a11d63a6083eRefgit.kernel.org/stable/c/4dafc411948469277b276724c3b2b4408c02c04cRefgit.kernel.org/stable/c/67cec2f1eb9e58719d622e92e2278ceda72dbd85Refgit.kernel.org/stable/c/81246a65303d9635266b1334490142caaf86a11fRefgit.kernel.org/stable/c/b6557f912509abe8e70223373dd7a44d1d4a0d6c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74270?

CVE-2026-74270 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-74270?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-74270?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-74270?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74270 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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