CVE-2026-31589

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

11 Nov 2026, 23:10

Type	Values Removed	Values Added
Summary		(es) En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: mm: llamar a -> free_folio() directamente en folio_unmap_invalidate() Solo podemos llamar a filemap_free_folio() si tenemos una referencia a (o mantenemos un bloqueo sobre) el mapeo. De lo contrario, ya hemos eliminado el folio del mapeo, por lo que ya no fija el mapeo y el mapeo puede ser eliminado, causando un uso después de liberación al acceder a mapping -> a_ops. Siga el mismo patrón que __remove_mapping() y cargue el puntero de función free_folio antes de liberar el bloqueo sobre el mapeo. Eso nos permite hacer filemap_free_folio() estática, ya que este era el único llamador fuera de filemap.c.

Information

Published : 2026-04-24 15:16

Updated : 2026-11-11 23:10

NVD link : CVE-2026-31589

Mitre link : CVE-2026-31589

CVE.ORG link : CVE-2026-31589

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-416

Use After Free

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Otherwise, we've already removed the folio from the\nmapping so it no longer pins the mapping and the mapping can be removed,\ncausing a use-after-free when accessing mapping->a_ops.\n\nFollow the same pattern as __remove_mapping() and load the free_folio\nfunction pointer before dropping the lock on the mapping. That lets us\nmake filemap_free_folio() static as this was the only caller outside\nfilemap.c."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm: llamar a -> free_folio() directamente en folio_unmap_invalidate()\n\nSolo podemos llamar a filemap_free_folio() si tenemos una referencia a (o mantenemos un bloqueo sobre) el mapeo. De lo contrario, ya hemos eliminado el folio del mapeo, por lo que ya no fija el mapeo y el mapeo puede ser eliminado, causando un uso despu\u00e9s de liberaci\u00f3n al acceder a mapping -> a_ops.\n\nSiga el mismo patr\u00f3n que __remove_mapping() y cargue el puntero de funci\u00f3n free_folio antes de liberar el bloqueo sobre el mapeo. Eso nos permite hacer filemap_free_folio() est\u00e1tica, ya que este era el \u00fanico llamador fuera de filemap.c."}], "lastModified": "2026-11-11T23:10:00.263", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "24221FC1-03CA-4C3B-99B7-27AFF9FC5FAE", "versionEndExcluding": "6.19.14", "versionStartIncluding": "6.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9B5888AB-7403-4335-89E4-21CC0B48366A", "versionEndExcluding": "7.0.1", "versionStartIncluding": "7.0"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}