CVE-2024-46838
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2024-46838
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-46838.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-46838
- Downstream
- Published
- 2024-09-27T12:39:33.755Z
- Modified
- 2025-11-28T02:34:30.933292Z
- Summary
- userfaultfd: don't BUG_ON() if khugepaged yanks our page table
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
userfaultfd: don't BUG_ON() if khugepaged yanks our page table
Since khugepaged was changed to allow retracting page tables in file mappings without holding the mmap lock, these BUG_ON()s are wrong - get rid of them.
We could also remove the preceding "if (unlikely(...))" block, but then we could reach pteoffsetmap_lock() with transhuge pages not just for file mappings but also for anonymous mappings - which would probably be fine but I think is not necessarily expected.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/46xxx/CVE-2024-46838.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a
- https://git.kernel.org/stable/c/4a594acc12d5954cdc71d4450a386748bf3d136a
- https://git.kernel.org/stable/c/db978287e908d48b209e374b00d847b2d785e0a9
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/46xxx/CVE-2024-46838.json
- https://nvd.nist.gov/vuln/detail/CVE-2024-46838