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CVE-2026-98405

8.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix missing iov bounds check in parse_posix_sids() In parse_posix_sids(), sidsbuf_end is calculated using the serv…

Published Oct 14, 2026EPSS 0.48%

Overview

CVE-2026-98405 is a high-severity vulnerability. It was published on October 14, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, 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: fix missing iov bounds check in parse_posix_sids()

In parse_posix_sids(), sidsbuf_end is calculated using the server-supplied

out_len without being validated against the actual length of the received

iov (iov_len).

If a server provides an inflated out_len, sidsbuf_end will point past the

end of the iov. This defeats the bounds guards in posix_info_sid_size(),

allowing out-of-bounds reads into adjacent kernel memory.

Fix this by rejecting responses where the calculated sidsbuf_end would

exceed the received iov boundaries or cause pointer wraparound.

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/2f8ed71aaaba3bc8b19cd9930cc62e63e142b299Refgit.kernel.org/stable/c/b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dcRefgit.kernel.org/stable/c/b862996e5105be1293da9cdc85da77b76021c3bdRefgit.kernel.org/stable/c/d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644Refgit.kernel.org/stable/c/eac6917a42899aad0617bbf04798c5dd946a1fe5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98405?

CVE-2026-98405 is a high-severity vulnerability. It was published on October 14, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-98405?

This vulnerability has a CVSS 3.1 base score of 8.1, 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-2026-98405?

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-2026-98405?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98405 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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