CVE-2024-36000: mm/hugetlb: fix missing hugetlb_lock for resv uncharge
Vulnerability summary
CVE-2024-36000 is a medium (CVSS 5.5) Reachable Assertion vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 13.1% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 25 · Related 16Timeline
- 20-05-2024PublishedVulnerability first disclosed.
- 23-05-2026Last modifiedVulnerability information updated.
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/000000000000ee06de0616177560@google.com/ 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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.22%
Chance of exploitation in the next 30 days
Percentile
13%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.22% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu117 products
- linuxAll versions (No fix recorded) | < 6.8.0-40.40
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.8.0-1013.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 79aa925bf239c234be8586780e482872dc4690dd, < 4c806333efea1000a2a9620926f560ad2e1ca7cc | ≥ 79aa925bf239c234be8586780e482872dc4690dd, < f6c5d21db16a0910152ec8aa9d5a7aed72694505 | ≥ 79aa925bf239c234be8586780e482872dc4690dd, < 538faabf31e9c53d8c870d114846fda958a0de10 | ≥ 79aa925bf239c234be8586780e482872dc4690dd, < b76b46902c2d0395488c8412e1116c2486cdfcb2 | f87004c0b2bdf0f1066b88795d8e6c1dfad6cea0 | ≥ 5.9.7, < 5.10 | 5.10
- linux_kernel≥ 5.9.7, < 5.10 | ≥ 5.10.1, < 6.1.91 | ≥ 6.2, < 6.6.30 | ≥ 6.7, < 6.8.9 | 5.10 | 5.10:rc3 | 5.10:rc4 | 5.10:rc5 | 5.10:rc6 | 5.10:rc7 | 6.9:rc1 | 6.9:rc2 | 6.9:rc3 | 6.9:rc4 | 6.9:rc5
Debian1 product
- linux< 6.1.94-1 | < 6.8.9-1
3 vendors · 120 products
