Bug 2517095 (CVE-2026-74570)

Summary:	CVE-2026-74570 kernel: ntfs: harden runlist realloc size calculations
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's NTFS file system driver. This vulnerability arises from insufficient size calculations during runlist memory reallocation, which could lead to an integer overflow. An attacker could potentially exploit this to cause memory corruption, leading to system instability or a denial of service (DoS).	Story Points:	---
Clone Of:		Environment:
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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 2026-08-15 12:50:05 UTC

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

ntfs: harden runlist realloc size calculations

Add a shared helper to safely convert runlist element counts to byte sizes
using overflow checks, and use it in both ntfs_rl_realloc() and
ntfs_rl_realloc_nofail().

Comment 1 TEJ RATHI 2026-08-17 13:08:21 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081554-CVE-2026-74570-2b8b@gregkh/T