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CVE-2026-43494

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net/rds: reset op_nents when zerocopy page pin fails When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(), the pin…

Published May 21, 2026CWE-1341EPSS 0.19%

Overview

CVE-2026-43494 is a high-severity vulnerability. It was published on May 21, 2026 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:

net/rds: reset op_nents when zerocopy page pin fails

When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(),

the pinned pages are released with put_page(), and

rm->data.op_mmp_znotifier is cleared. But we fail to properly

clear rm->data.op_nents.

Later when rds_message_purge() is called from rds_sendmsg() the

cleanup loop iterates over the incorrectly non zero number of

op_nents and frees them again.

Fix this by properly resetting op_nents when it should be in

rds_message_zcopy_from_user().

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/03014551938a0887fa55f18ce49b70158a9c0113Refgit.kernel.org/stable/c/0bbbff00a15b1df2cac9014d6cf4b6890f473353Refgit.kernel.org/stable/c/290e833d1acb1093bc121fcdc97f5e6161157479Refgit.kernel.org/stable/c/640e37f58f991546a87540d067279c2c1fa9fe51Refgit.kernel.org/stable/c/9115669faedccdda100428e2d26fd0aac8c50799Refgit.kernel.org/stable/c/c6e51512a784c4a7b86e1a044988696e3b3721faRefgit.kernel.org/stable/c/d84ce1786ce40fdd3dd98db47aec5527817e1ef6Refgit.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4GitHubgithub.com/v12-security/pocs/tree/main/pintheftRefwww.openwall.com/lists/oss-security/2026/05/21/2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43494?

CVE-2026-43494 is a high-severity vulnerability. It was published on May 21, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-43494?

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-2026-43494?

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-2026-43494?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43494 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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