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CVE-2024-39477

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: do not call vma_add_reservation upon ENOMEM sysbot reported a splat [1] on __unmap_hugepage_range().

Published Jul 5, 2024CWE-770EPSS 0.19%

Overview

CVE-2024-39477 is a high-severity vulnerability. It was published on July 5, 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:

mm/hugetlb: do not call vma_add_reservation upon ENOMEM

sysbot reported a splat [1] on __unmap_hugepage_range(). This is because

vma_needs_reservation() can return -ENOMEM if

allocate_file_region_entries() fails to allocate the file_region struct

for the reservation.

Check for that and do not call vma_add_reservation() if that is the case,

otherwise region_abort() and region_del() will see that we do not have any

file_regions.

If we detect that vma_needs_reservation() returned -ENOMEM, we clear the

hugetlb_restore_reserve flag as if this reservation was still consumed, so

free_huge_folio() will not increment the resv count.

[1] https://lore.kernel.org/linux-mm/[email protected]/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa

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/8daf9c702ee7f825f0de8600abff764acfedea13Refgit.kernel.org/stable/c/aa998f9dcb34c28448f86e8f5490f20d5eb0eac7Refgit.kernel.org/stable/c/8daf9c702ee7f825f0de8600abff764acfedea13Refgit.kernel.org/stable/c/aa998f9dcb34c28448f86e8f5490f20d5eb0eac7

How CyberStrike helps

Frequently asked questions

What is CVE-2024-39477?

CVE-2024-39477 is a high-severity vulnerability. It was published on July 5, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2024-39477?

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-2024-39477?

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-2024-39477?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-39477 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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