Bug 2481929 (CVE-2025-71311)

Summary:	CVE-2025-71311 kernel: fs/ntfs3: Initialize new folios before use
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's `fs/ntfs3` component. When new memory pages (folios) are allocated for the NTFS3 file system without being properly initialized, and a read operation is skipped, parts of these folios may contain uninitialized memory. This can lead to a memory corruption vulnerability.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-27 15:02:51 UTC

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

fs/ntfs3: Initialize new folios before use

KMSAN reports an uninitialized value in longest_match_std(), invoked
from ntfs_compress_write(). When new folios are allocated without being
marked uptodate and ni_read_frame() is skipped because the caller expects
the frame to be completely overwritten, some reserved folios may remain
only partially filled, leaving the rest memory uninitialized.

Comment 1 Keith Grant 2026-05-28 20:11:27 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052715-CVE-2025-71311-0a09@gregkh/T