Bug 2521503 (CVE-2026-74627)

Summary:	CVE-2026-74627 kernel: net: devmem: prevent net-iov / page mixing
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 `net: devmem` component. This vulnerability occurs when `net_iov` and page-backed fragments are improperly mixed within a single `skb` (socket buffer) in the `zerocopy_fill_skb_from_devmem()` function. This improper handling can lead to a system crash, resulting in a Denial of Service (DoS).	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 2026-08-22 15:48:44 UTC

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

net: devmem: prevent net-iov / page mixing

We should either have net_iov or page backed frags in a single skb,
otherwise it blows up down the stack. Don't allow mixing in
zerocopy_fill_skb_from_devmem().

Comment 1 gkamathe 2026-08-24 14:11:13 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082220-CVE-2026-74627-6aa8@gregkh/T