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CVE-2026-23230

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: smb: client: split cached_fid bitfields to avoid shared-byte RMW races is_open, has_lease and on_list are stored in the same bi…

Published Feb 18, 2026EPSS 0.26%

Overview

CVE-2026-23230 is a high-severity vulnerability. It was published on February 18, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. 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:

smb: client: split cached_fid bitfields to avoid shared-byte RMW races

is_open, has_lease and on_list are stored in the same bitfield byte in

struct cached_fid but are updated in different code paths that may run

concurrently. Bitfield assignments generate byte read–modify–write

operations (e.g. `orb $mask, addr` on x86_64), so updating one flag can

restore stale values of the others.

A possible interleaving is:

CPU1: load old byte (has_lease=1, on_list=1)

CPU2: clear both flags (store 0)

CPU1: RMW store (old | IS_OPEN) -> reintroduces cleared bits

To avoid this class of races, convert these flags to separate bool

fields.

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/3eaa22d688311c708b73f3c68bc6d0c8e3f0f77aRefgit.kernel.org/stable/c/4386f6af8aaedd0c5ad6f659b40cadcc8f423828Refgit.kernel.org/stable/c/4cfa4c37dcbcfd70866e856200ed8a2894cac578Refgit.kernel.org/stable/c/569fecc56bfe4df66f05734d67daef887746656bRefgit.kernel.org/stable/c/c4b9edd55987384a1f201d3d07ff71e448d79c1bRefgit.kernel.org/stable/c/ec306600d5ba7148c9dbf8f5a8f1f5c1a044a241Refcert-portal.siemens.com/productcert/html/ssa-253495.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23230?

CVE-2026-23230 is a high-severity vulnerability. It was published on February 18, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-23230?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-23230?

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-2026-23230?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23230 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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