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CVE-2025-21832

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: block: don't revert iter for -EIOCBQUEUED blkdev_read_iter() has a few odd checks, like gating the position and count adjustmen…

Published Mar 6, 2025EPSS 0.19%

Overview

CVE-2025-21832 is a high-severity vulnerability. It was published on March 6, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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: don't revert iter for -EIOCBQUEUED

blkdev_read_iter() has a few odd checks, like gating the position and

count adjustment on whether or not the result is bigger-than-or-equal to

zero (where bigger than makes more sense), and not checking the return

value of blkdev_direct_IO() before doing an iov_iter_revert(). The

latter can lead to attempting to revert with a negative value, which

when passed to iov_iter_revert() as an unsigned value will lead to

throwing a WARN_ON() because unroll is bigger than MAX_RW_COUNT.

Be sane and don't revert for -EIOCBQUEUED, like what is done in other

spots.

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/68f16d3034a06661245ecd22f0d586a8b4e7c473Refgit.kernel.org/stable/c/6c26619effb1b4cb7d20b4e666ab8f71f6a53ccbRefgit.kernel.org/stable/c/84671b0630ccb46ae9f1f99a45c7d63ffcd6a474Refgit.kernel.org/stable/c/a58f136bad29f9ae721a29d98c042fddbee22f77Refgit.kernel.org/stable/c/b13ee668e8280ca5b07f8ce2846b9957a8a10853Reflists.debian.org/debian-lts-announce/2025/03/msg00028.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21832?

CVE-2025-21832 is a high-severity vulnerability. It was published on March 6, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-21832?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21832?

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-2025-21832?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21832 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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