CVE-2026-31589
Severity CVSS v4.0:
Pending analysis
Type:
CWE-416
Use After Free
Publication date:
24/04/2026
Last modified:
07/05/2026
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
mm: call ->free_folio() directly in folio_unmap_invalidate()<br />
<br />
We can only call filemap_free_folio() if we have a reference to (or hold a<br />
lock on) the mapping. Otherwise, we&#39;ve already removed the folio from the<br />
mapping so it no longer pins the mapping and the mapping can be removed,<br />
causing a use-after-free when accessing mapping->a_ops.<br />
<br />
Follow the same pattern as __remove_mapping() and load the free_folio<br />
function pointer before dropping the lock on the mapping. That lets us<br />
make filemap_free_folio() static as this was the only caller outside<br />
filemap.c.
Impact
Base Score 3.x
9.80
Severity 3.x
CRITICAL
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 6.14 (including) | 6.19.14 (excluding) |
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 7.0 (including) | 7.0.1 (excluding) |
To consult the complete list of CPE names with products and versions, see this page