CVE-2024-47676: mm/hugetlb.c: fix UAF of vma in hugetlb fault pathway
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 hugetlbfault(). This happens because vmfanonprepare() could drop the per-VMA lock and allow the current VMA to be freed before hugetlbvmaunlockread() is called.
We can fix this by using a modified version of vmfanonprepare() that doesn't release the VMA lock on failure, and then release it ourselves after hugetlbvmaunlockread().
Other sources
This CVE was automatically created from a reference found in an email or other text. If you are reading this, then this CVE entry is probably erroneous, since this text should be replaced by the official CVE description automatically.
— Launchpad
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.22-1Fixed in 6.12.25-1
Event History
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.