In the Linux kernel, the following vulnerability has been resolved:
filemap: replace pte_offset_map() with pte_offset_map_nolock()
The vmf->ptl in filemap_fault_recheck_pte_none() is still set from
handle_pte_fault(). But at the same time, we did a pte_unmap(vmf->pte).
After a pte_unmap(vmf->pte) unmap and rcu_read_unlock(), the page table
may be racily changed and vmf->ptl maybe fails to protect the actual page
table. Fix this by replacing pte_offset_map() with
pte_offset_map_nolock().
As David said, the PTL pointer might be stale so if we continue to use
it infilemap_fault_recheck_pte_none(), it might trigger UAF. Also, if
the PTL fails, the issue fixed by commit 58f327f2ce80 ("filemap: avoid
unnecessary major faults in filemap_fault()") might reappear.
References
Configurations
History
08 Aug 2024, 14:56
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux
Linux linux Kernel |
|
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 3.3 |
| CWE | NVD-CWE-noinfo | |
| References | () https://git.kernel.org/stable/c/24be02a42181f0707be0498045c4c4b13273b16d - Patch | |
| References | () https://git.kernel.org/stable/c/6a6c2aec1a89506595801b4cf7e8eef035f33748 - Patch |
07 Aug 2024, 16:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2024-08-07 16:15
Updated : 2024-08-08 14:56
NVD link : CVE-2024-42233
Mitre link : CVE-2024-42233
JSON object : View
Products Affected
linux
- linux_kernel
CWE