CVE-2024-46838: userfaultfd: don't BUG_ON() if khugepaged yanks our page table
First published: Fri Sep 27 2024(Updated: )
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 pte_offset_map_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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.6<6.6.51 | |
| Linux Kernel | >=6.7<6.10.10 | |
| Linux Kernel | =6.11-rc1 | |
| Linux Kernel | =6.11-rc2 | |
| Linux Kernel | =6.11-rc3 | |
| Linux Kernel | =6.11-rc4 | |
| Linux Kernel | =6.11-rc5 | |
| Linux Kernel | =6.11-rc6 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 6.12.11-1 |
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Reference Links
- https://git.kernel.org/stable/c/4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a
- https://git.kernel.org/stable/c/4a594acc12d5954cdc71d4450a386748bf3d136a
- https://git.kernel.org/stable/c/db978287e908d48b209e374b00d847b2d785e0a9
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-46838
- https://nvd.nist.gov/vuln/detail/CVE-2024-46838
- https://launchpad.net/bugs/cve/CVE-2024-46838
- https://security-tracker.debian.org/tracker/CVE-2024-46838
- https://ubuntu.com/security/CVE-2024-46838
- https://git.kernel.org/linus/4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a
Frequently Asked Questions
What is the severity of CVE-2024-46838?
CVE-2024-46838 has been classified as having moderate severity due to its implications for system stability.
How do I fix CVE-2024-46838?
To fix CVE-2024-46838, update the Linux kernel to versions 5.10.223-1, 5.10.226-1, 6.1.119-1, 6.1.123-1, 6.12.10-1, or 6.12.11-1.
What versions of the Linux kernel are affected by CVE-2024-46838?
CVE-2024-46838 affects Linux kernel versions between 6.7 and 6.10.10, as well as specific release candidates of 6.11.
Is CVE-2024-46838 exploitable remotely?
CVE-2024-46838 is not classified as remotely exploitable, as it primarily affects local system operations.
Does CVE-2024-46838 impact security features in the Linux kernel?
CVE-2024-46838 primarily affects system stability rather than directly impacting security features.
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