Bug 2481947 (CVE-2026-45896)

Summary:	CVE-2026-45896 kernel: mtd: intel-dg: Fix accessing regions before setting nregions
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
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 `mtd_intel_dg` driver. This vulnerability occurs because the `regions` array is accessed before its size (`nregions`) is properly set, leading to an out-of-bounds memory access. A local attacker could potentially exploit this issue to cause system instability or a denial of service (DoS). The flaw also involves the driver silently ignoring memory allocation errors, which can contribute to unexpected system behavior.	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 15:03:45 UTC

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

mtd: intel-dg: Fix accessing regions before setting nregions

The regions array is counted by nregions, but it's set only after
accessing it:

[] UBSAN: array-index-out-of-bounds in drivers/mtd/devices/mtd_intel_dg.c:750:15
[] index 0 is out of range for type '<unknown> [*]'

Fix it by also fixing an undesired behavior: the loop silently ignores
ENOMEM and continues setting the other entries.

Comment 1 Keith Grant 2026-05-28 02:37:51 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052718-CVE-2026-45896-a4e9@gregkh/T