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CVE-2026-43350

7.6 · HIGH

In the Linux kernel, the following vulnerability has been resolved: smb: client: require a full NFS mode SID before reading mode bits parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as…

Published May 8, 2026EPSS 0.26%

Overview

CVE-2026-43350 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 7.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.6, 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: require a full NFS mode SID before reading mode bits

parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS

mode SID and reads sid.sub_auth[2] to recover the mode bits.

That assumes the ACE carries three subauthorities, but compare_sids()

only compares min(a, b) subauthorities. A malicious server can return

an ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still

matches sid_unix_NFS_mode and then drives the sub_auth[2] read four

bytes past the end of the ACE.

Require num_subauth >= 3 before treating the ACE as an NFS mode SID.

This keeps the fix local to the special-SID mode path without changing

compare_sids() semantics for the rest of cifsacl.

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/1592a6cd6f653f2d24572a6976c7a775b19f4940Refgit.kernel.org/stable/c/23b54d6cc3ef30a51d984dc74364f24039ae2ecbRefgit.kernel.org/stable/c/2757ad3e4b6f9e0fed4c7739594e702abc5cab21Refgit.kernel.org/stable/c/38a69f08ee82c450d3e4168707fff2e317dc3ff7Refgit.kernel.org/stable/c/8bd4cad3f458d11650d51c2d24b03fb1770ae6ccRefgit.kernel.org/stable/c/b53b8e98c23310294fc45fc686db5ee860311896Refgit.kernel.org/stable/c/c8eef12af1cc73031639ea7cf16e0b10e2536b0bRefgit.kernel.org/stable/c/f8488c07bea2431ee12a6067d736578064fa46b4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43350?

CVE-2026-43350 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 7.6 (HIGH).

How severe is CVE-2026-43350?

This vulnerability has a CVSS 3.1 base score of 7.6, 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-2026-43350?

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-2026-43350?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43350 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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