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CVE-2024-36943

7.3 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan make_uffd_wp_pte() was previously doing: pte = ptep_get(p…

Published May 30, 2024EPSS 0.18%

Overview

CVE-2024-36943 is a high-severity vulnerability. It was published on May 30, 2024 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, 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:

fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan

make_uffd_wp_pte() was previously doing:

pte = ptep_get(ptep);

ptep_modify_prot_start(ptep);

pte = pte_mkuffd_wp(pte);

ptep_modify_prot_commit(ptep, pte);

But if another thread accessed or dirtied the pte between the first 2

calls, this could lead to loss of that information. Since

ptep_modify_prot_start() gets and clears atomically, the following is the

correct pattern and prevents any possible race. Any access after the

first call would see an invalid pte and cause a fault:

pte = ptep_modify_prot_start(ptep);

pte = pte_mkuffd_wp(pte);

ptep_modify_prot_commit(ptep, pte);

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/74b3d66f91d9f539f99faad74d796fa9a389a015Refgit.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4Refgit.kernel.org/stable/c/74b3d66f91d9f539f99faad74d796fa9a389a015Refgit.kernel.org/stable/c/c70dce4982ce1718bf978a35f8e26160b82081f4

How CyberStrike helps

Frequently asked questions

What is CVE-2024-36943?

CVE-2024-36943 is a high-severity vulnerability. It was published on May 30, 2024 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2024-36943?

This vulnerability has a CVSS 3.1 base score of 7.3, 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-2024-36943?

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-2024-36943?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-36943 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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