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CVE-2026-45972

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix potential UAF and double free in smb2_open_file() Zero out @err_iov and @err_buftype before retrying SMB2_open…

Published May 27, 2026CWE-416EPSS 0.33%

Overview

CVE-2026-45972 is a critical-severity vulnerability. It was published on May 27, 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:

smb: client: fix potential UAF and double free in smb2_open_file()

Zero out @err_iov and @err_buftype before retrying SMB2_open() to

prevent an UAF bug if @data != NULL, otherwise a double free.

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/4d339b219004869e96c4ce56b8891f83a38da4c0Refgit.kernel.org/stable/c/639deb962986ef2f5e2a6d5a600c66f922471e81Refgit.kernel.org/stable/c/7425453ea16dbc3bbb0f6cac4d60b537e5e4d151Refgit.kernel.org/stable/c/96e53bb3ee2f354cf6b4ab07bcc56e500f8b3f74Refgit.kernel.org/stable/c/e66dcf7bb9c4df5582c82bc3582725abcbfbea73Refgit.kernel.org/stable/c/ebbbc4bfad4cb355d17c671223d0814ee3ef4edaRefaccess.redhat.com/security/cve/CVE-2026-45972Refbugzilla.redhat.com/show_bug.cgi?id=2481973Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45972.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-45972?

CVE-2026-45972 is a critical-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-45972?

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-2026-45972?

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-2026-45972?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-45972 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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