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CVE-2024-35791

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region() Do the cache flush of converted pages in svm_regi…

Published May 17, 2024CWE-416EPSS 0.24%

Overview

CVE-2024-35791 is a high-severity vulnerability. It was published on May 17, 2024 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:

KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()

Do the cache flush of converted pages in svm_register_enc_region() before

dropping kvm->lock to fix use-after-free issues where region and/or its

array of pages could be freed by a different task, e.g. if userspace has

__unregister_enc_region_locked() already queued up for the region.

Note, the "obvious" alternative of using local variables doesn't fully

resolve the bug, as region->pages is also dynamically allocated. I.e. the

region structure itself would be fine, but region->pages could be freed.

Flushing multiple pages under kvm->lock is unfortunate, but the entire

flow is a rare slow path, and the manual flush is only needed on CPUs that

lack coherency for encrypted memory.

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/12f8e32a5a389a5d58afc67728c76e61beee1ad4Refgit.kernel.org/stable/c/2d13b79640b147bd77c34a5998533b2021a4122dRefgit.kernel.org/stable/c/4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865Refgit.kernel.org/stable/c/5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807Refgit.kernel.org/stable/c/e126b508ed2e616d679d85fca2fbe77bb48bbdd7Refgit.kernel.org/stable/c/f6d53d8a2617dd58c89171a6b9610c470ebda38aRefgit.kernel.org/stable/c/12f8e32a5a389a5d58afc67728c76e61beee1ad4Refgit.kernel.org/stable/c/2d13b79640b147bd77c34a5998533b2021a4122dRefgit.kernel.org/stable/c/4868c0ecdb6cfde7c70cf478c46e06bb9c7e5865Refgit.kernel.org/stable/c/5ef1d8c1ddbf696e47b226e11888eaf8d9e8e807

How CyberStrike helps

Frequently asked questions

What is CVE-2024-35791?

CVE-2024-35791 is a high-severity vulnerability. It was published on May 17, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-35791?

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-2024-35791?

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-2024-35791?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-35791 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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