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CVE-2026-43240

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: x86/kexec: add a sanity check on previous kernel's ima kexec buffer When the second-stage kernel is booted via kexec with a lim…

Published May 6, 2026EPSS 0.12%

Overview

CVE-2026-43240 is a medium-severity vulnerability. It was published on May 6, 2026 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:

x86/kexec: add a sanity check on previous kernel's ima kexec buffer

When the second-stage kernel is booted via kexec with a limiting command

line such as "mem=<size>", the physical range that contains the carried

over IMA measurement list may fall outside the truncated RAM leading to a

kernel panic.

BUG: unable to handle page fault for address: ffff97793ff47000

RIP: ima_restore_measurement_list+0xdc/0x45a

#PF: error_code(0x0000) – not-present page

Other architectures already validate the range with page_is_ram(), as done

in commit cbf9c4b9617b ("of: check previous kernel's ima-kexec-buffer

against memory bounds") do a similar check on x86.

Without carrying the measurement list across kexec, the attestation

would fail.

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/22e460b6333a5f818b042ac89201f8e735556f4aRefgit.kernel.org/stable/c/37f18915a261afe84dab462624ed829cddb77a9bRefgit.kernel.org/stable/c/4d7a8f5f28187e3d2958b2a134473da2665207e7Refgit.kernel.org/stable/c/7e2476057950c174c7b2c2802246707bbfb497e4Refgit.kernel.org/stable/c/c5489d04337b47e93c0623e8145fcba3f5739efdRefgit.kernel.org/stable/c/d4a132f121c591b60dbaf57ea91f1faf11631fbcRefgit.kernel.org/stable/c/f8f73bf0f8a57ee9b86792456bd42079bc98c6b7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43240?

CVE-2026-43240 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43240?

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-2026-43240?

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-2026-43240?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43240 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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