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CVE-2026-46195

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building DACL pointers parse_sec_desc(), build_sec_desc(), and the chown path in id_mod…

Published May 28, 2026CWE-476EPSS 0.68%

Overview

CVE-2026-46195 is a critical-severity vulnerability. It was published on May 28, 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: validate dacloffset before building DACL pointers

parse_sec_desc(), build_sec_desc(), and the chown path in

id_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd

before proving a DACL header fits inside the returned security

descriptor.

On 32-bit builds a malicious server can return dacloffset near

U32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip

past the later pointer-based bounds checks. build_sec_desc() and

id_mode_to_cifs_acl() can then dereference DACL fields from the wrapped

pointer in the chmod/chown rewrite paths.

Validate dacloffset numerically before building any DACL pointer and

reuse the same helper at the three DACL entry points.

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/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7Refgit.kernel.org/stable/c/5de2665e913a10ad70aaeecf736b97276e83d995Refgit.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8aRefgit.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505Refgit.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322aRefgit.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3Refgit.kernel.org/stable/c/f9dc3be8f403c1216df73e57221f44b045e7ee0bRefaccess.redhat.com/errata/RHSA-2026:21556Refaccess.redhat.com/errata/RHSA-2026:21706Refaccess.redhat.com/errata/RHSA-2026:21745

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46195?

CVE-2026-46195 is a critical-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-46195?

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-2026-46195?

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-2026-46195?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46195 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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