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CVE-2026-80980

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net/smc: stop killed, freed and out_of_sync sharing a byte The three connection state flags are single-bit bitfields, so they o…

Published Sep 11, 2026EPSS 0.68%

Overview

CVE-2026-80980 is a critical-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net/smc: stop killed, freed and out_of_sync sharing a byte

The three connection state flags are single-bit bitfields, so they occupy

one byte of struct smc_connection and every store to one is a

read-modify-write of the other two:

u8 killed : 1;

u8 freed : 1;

u8 out_of_sync : 1;

They are not written under a common lock. smc_cdc_msg_validate() sets

out_of_sync from the receive tasklet, while smc_conn_kill() sets killed

from process context under lock_sock(), and the receive path does not defer

to the backlog when the socket is owned -- smc_cdc_msg_recv() takes only

bh_lock_sock().

Give each flag its own byte so a store no longer touches its neighbours.

All readers test them as booleans and are unchanged. struct smc_connection

grows by two bytes.

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/09a9cbadc05f452405de31012bd2c428b601291aRefgit.kernel.org/stable/c/297e96f38d3e4f1a3b84068950dd5c7a55bbdc7bRefgit.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aecRefgit.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9Refgit.kernel.org/stable/c/a6efc0f4dbdba6595d89cdaf2d8f26f68be16f0bRefgit.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447

How CyberStrike helps

Frequently asked questions

What is CVE-2026-80980?

CVE-2026-80980 is a critical-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-80980?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-80980?

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-2026-80980?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-80980 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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