Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-68457

9.1 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for FSCTL mutations SET_SPARSE, SET_ZERO_DATA and SET_COMPRESSION operate on an open SMB handle b…

Published Aug 15, 2026EPSS 0.70%

Overview

CVE-2026-68457 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.1, 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:

ksmbd: use opener credentials for FSCTL mutations

SET_SPARSE, SET_ZERO_DATA and SET_COMPRESSION operate on an open SMB

handle but call VFS xattr, fallocate or fileattr helpers with the current

ksmbd worker credentials. Those helpers can revalidate inode permissions,

ownership and LSM policy independently of the SMB handle access mask.

Run each operation with the credentials captured in the target file when

the handle was opened. Keep credential handling local to these single-file

FSCTLs rather than applying session credentials to the complete IOCTL

handler, which also contains handle-less and multi-handle operations.

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/1e112c47ec5dd1942e2d4ca6e8e9b712238e20c2Refgit.kernel.org/stable/c/a8c18434e1f0d9f7989170bdb0490c0160baf065Refgit.kernel.org/stable/c/c6394bcaf254c5baf9aff43376020be5db6d3316Refgit.kernel.org/stable/c/cfb2c6f71d61ed807c9d7a7af331d406f1f31877Refgit.kernel.org/stable/c/e205f3e7e8c31a47cd11efb6cf663a527177e432Refgit.kernel.org/stable/c/fb1cae6302d58414ddf029e3f642711bd30243f7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-68457?

CVE-2026-68457 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-68457?

This vulnerability has a CVSS 3.1 base score of 9.1, 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-2026-68457?

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-2026-68457?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-68457 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.

Related CRITICAL CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999