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CVE-2024-26990

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status Check kvm_mmu_page_ad_need_write_protect() when deci…

Published May 1, 2024EPSS 0.24%

Overview

CVE-2024-26990 is a high-severity vulnerability. It was published on May 1, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, 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:

KVM: x86/mmu: Write-protect L2 SPTEs in TDP MMU when clearing dirty status

Check kvm_mmu_page_ad_need_write_protect() when deciding whether to

write-protect or clear D-bits on TDP MMU SPTEs, so that the TDP MMU

accounts for any role-specific reasons for disabling D-bit dirty logging.

Specifically, TDP MMU SPTEs must be write-protected when the TDP MMU is

being used to run an L2 (i.e. L1 has disabled EPT) and PML is enabled.

KVM always disables PML when running L2, even when L1 and L2 GPAs are in

the some domain, so failing to write-protect TDP MMU SPTEs will cause

writes made by L2 to not be reflected in the dirty log.

[sean: massage shortlog and changelog, tweak ternary op formatting]

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/2673dfb591a359c75080dd5af3da484b89320d22Refgit.kernel.org/stable/c/cdf811a937471af2d1facdf8ae80e5e68096f1edRefgit.kernel.org/stable/c/e20bff0f1b2de9cfe303dd35ff46470104a87404Refgit.kernel.org/stable/c/2673dfb591a359c75080dd5af3da484b89320d22Refgit.kernel.org/stable/c/cdf811a937471af2d1facdf8ae80e5e68096f1edRefgit.kernel.org/stable/c/e20bff0f1b2de9cfe303dd35ff46470104a87404Reflists.fedoraproject.org/archives/list/[email protected]/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/Reflists.fedoraproject.org/archives/list/[email protected]/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/Reflists.fedoraproject.org/archives/list/[email protected]/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26990?

CVE-2024-26990 is a high-severity vulnerability. It was published on May 1, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2024-26990?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2024-26990?

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-2024-26990?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26990 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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