CVE-2024-36000: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix missing hugetlb_lock for resv uncharge There is a recent report on UFFDIO_COPY over hugetlb: https://lore.kernel.org/all/[email protected]/ 350: lockdep_assert_held(&hugetlb_lock); Should be an issue in hugetlb but triggered in an userfault context, where it goes into the unlikely path where two threads modifying the resv map together. Mike has a fix in that path for resv uncharge but it looks like the locking criteria was overlooked: hugetlb_cgroup_uncharge_folio_rsvd() will update the cgroup pointer, so it requires to be called with the lock held.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-617 CWE-617

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.9.7 — 5.10
linux	linux_kernel	5.10.1 — 6.1.91
linux	linux_kernel	6.2 — 6.6.30
linux	linux_kernel	6.7 — 6.8.9
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/4c806333efea1000a2a9620926f560ad2e1ca7cc https://git.kernel.org/stable/c/538faabf31e9c53d8c870d114846fda958a0de10 https://git.kernel.org/stable/c/b76b46902c2d0395488c8412e1116c2486cdfcb2 https://git.kernel.org/stable/c/f6c5d21db16a0910152ec8aa9d5a7aed72694505 https://git.kernel.org/stable/c/4c806333efea1000a2a9620926f560ad2e1ca7cc https://git.kernel.org/stable/c/538faabf31e9c53d8c870d114846fda958a0de10 https://git.kernel.org/stable/c/b76b46902c2d0395488c8412e1116c2486cdfcb2 https://git.kernel.org/stable/c/f6c5d21db16a0910152ec8aa9d5a7aed72694505

Frequently Asked Questions

What is CVE-2024-36000? +

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix missing hugetlb_lock for resv uncharge There is a recent report on UFFDIO_COPY over hugetlb: https://lore.kernel.org/all/[email protected]/ 350: lockdep_assert_held(&hugetlb_lock); Should be an issue in hugetlb but triggered in an userfault context, where it goes into the unlikely path where two threads modifying the resv map together. Mike has a fix in that path for resv uncharge but it looks like the locking criteria was overlooked: hugetlb_cgroup_uncharge_folio_rsvd() will update the cgroup pointer, so it requires to be called with the lock held. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-36000? +

CVE-2024-36000 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-36000? +

CVE-2024-36000 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-36000? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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