CVE-2024-47676 Information

Description

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().

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://git.kernel.org/stable/c/e897d184a8dd4a4e1f39c8c495598e4d9472776c https://git.kernel.org/stable/c/d59ebc99dee0a2687a26df94b901eb8216dbf876 https://git.kernel.org/stable/c/98b74bb4d7e96b4da5ef3126511febe55b76b807

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8