CVE-2024-42233
filemap: replace pte_offset_map() with pte_offset_map_nolock()
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-07-30 CVE Reserved
- 2024-08-07 CVE Published
- 2024-08-13 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (3)
URL | Tag | Source |
---|---|---|
https://git.kernel.org/stable/c/58f327f2ce80f9c7b4a70e9cf017ae8810d44a20 | Vuln. Introduced |
URL | Date | SRC |
---|
URL | Date | SRC |
---|---|---|
https://git.kernel.org/stable/c/6a6c2aec1a89506595801b4cf7e8eef035f33748 | 2024-07-18 | |
https://git.kernel.org/stable/c/24be02a42181f0707be0498045c4c4b13273b16d | 2024-07-09 |
URL | Date | SRC |
---|
Affected Vendors, Products, and Versions
Vendor | Product | Version | Other | Status | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.9 < 6.9.10 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.9 < 6.9.10" | en |
Affected
| ||||||
Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 6.9 < 6.10 Search vendor "Linux" for product "Linux Kernel" and version " >= 6.9 < 6.10" | en |
Affected
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