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CVE-2024-26844

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: block: Fix WARNING in _copy_from_iter Syzkaller reports a warning in _copy_from_iter because an iov_iter is supposedly used in…

Published Apr 17, 2024EPSS 0.22%

Overview

CVE-2024-26844 is a medium-severity vulnerability. It was published on April 17, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

block: Fix WARNING in _copy_from_iter

Syzkaller reports a warning in _copy_from_iter because an

iov_iter is supposedly used in the wrong direction. The reason

is that syzcaller managed to generate a request with

a transfer direction of SG_DXFER_TO_FROM_DEV. This instructs

the kernel to copy user buffers into the kernel, read into

the copied buffers and then copy the data back to user space.

Thus the iovec is used in both directions.

Detect this situation in the block layer and construct a new

iterator with the correct direction for the copy-in.

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/0f1bae071de9967602807472921829a54b2e5956Refgit.kernel.org/stable/c/13f3956eb5681a4045a8dfdef48df5dc4d9f58a6Refgit.kernel.org/stable/c/8fc80874103a5c20aebdc2401361aa01c817f75bRefgit.kernel.org/stable/c/cbaf9be337f7da25742acfce325119e3395b1f1bRefgit.kernel.org/stable/c/0f1bae071de9967602807472921829a54b2e5956Refgit.kernel.org/stable/c/13f3956eb5681a4045a8dfdef48df5dc4d9f58a6Refgit.kernel.org/stable/c/8fc80874103a5c20aebdc2401361aa01c817f75bRefgit.kernel.org/stable/c/cbaf9be337f7da25742acfce325119e3395b1f1b

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26844?

CVE-2024-26844 is a medium-severity vulnerability. It was published on April 17, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-26844?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-26844?

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-2024-26844?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26844 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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