CVE-2024-47676: mm/hugetlb.c: fix UAF of vma in hugetlb fault pathway
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb.c: fix UAF of vma in hugetlb fault pathway Syzbot reports a UAF in hugetlb_fault(). This happens because vmf_anon_prepare() could drop the per-VMA lock and allow the current VMA to be freed before hugetlb_vma_unlock_read() is called. We can fix this by using a modified version of vmf_anon_prepare() that doesn't release the VMA lock on failure, and then release it ourselves after hugetlb_vma_unlock_read().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.9<6.10.13 | |
| Linux Kernel | >=6.11<6.11.2 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.135-1 6.12.22-1 6.12.25-1 |
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Reference Links
- https://git.kernel.org/stable/c/e897d184a8dd4a4e1f39c8c495598e4d9472776c
- https://git.kernel.org/stable/c/d59ebc99dee0a2687a26df94b901eb8216dbf876
- https://git.kernel.org/stable/c/98b74bb4d7e96b4da5ef3126511febe55b76b807
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-47676
- https://nvd.nist.gov/vuln/detail/CVE-2024-47676
- https://launchpad.net/bugs/cve/CVE-2024-47676
- https://security-tracker.debian.org/tracker/CVE-2024-47676
- https://ubuntu.com/security/CVE-2024-47676
- https://git.kernel.org/linus/98b74bb4d7e96b4da5ef3126511febe55b76b807
Frequently Asked Questions
What is the severity of CVE-2024-47676?
CVE-2024-47676 is considered a high severity vulnerability due to its potential for user-after-free exploitation in the Linux kernel.
How do I fix CVE-2024-47676?
To fix CVE-2024-47676, update your Linux kernel to a version that is patched for this vulnerability, specifically any above 6.10.13 or 6.11.2.
What systems are affected by CVE-2024-47676?
CVE-2024-47676 affects Linux kernel versions between 6.9 and 6.10.13 and between 6.11 and 6.11.2.
What is the nature of the vulnerability in CVE-2024-47676?
CVE-2024-47676 is a user-after-free vulnerability that can occur due to improper handling of virtual memory areas in the hugetlb fault pathway.
Who reported CVE-2024-47676?
CVE-2024-47676 was reported by Syzbot, which is a fuzzer for the Linux kernel.
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