9.8

CVE-2026-31589

mm: call ->free_folio() directly in folio_unmap_invalidate()

In the Linux kernel, the following vulnerability has been resolved:

mm: call ->free_folio() directly in folio_unmap_invalidate()

We can only call filemap_free_folio() if we have a reference to (or hold a
lock on) the mapping.  Otherwise, we've already removed the folio from the
mapping so it no longer pins the mapping and the mapping can be removed,
causing a use-after-free when accessing mapping->a_ops.

Follow the same pattern as __remove_mapping() and load the free_folio
function pointer before dropping the lock on the mapping.  That lets us
make filemap_free_folio() static as this was the only caller outside
filemap.c.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.14 < 6.19.14
Linux ≫ Linux Kernel Version >= 7.0 < 7.0.1
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.44% 0.353
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/b667df39d98a7a24be7c2a40ff0863dac1ad2cd7
Patch
https://git.kernel.org/stable/c/c330e65ea59c4805d6ab6757c4ddfe8c63acef31
Patch
https://git.kernel.org/stable/c/615d9bb2ccad42f9e21d837431e401db2e471195
Patch
https://git.kernel.org/stable/c/efc52947247a21bbf79059539bbbd40f4ea76f00