Bug 2516914 (CVE-2026-74432)

Summary:	CVE-2026-74432 kernel: rxrpc: Fix leak of released call in recvmsg(MSG_PEEK)
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
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 rxrpc component of the Linux kernel. When the `recvmsg()` function is called with the `MSG_PEEK` flag, it fails to properly release a reference to an already-released call. This oversight can lead to a memory leak, potentially allowing a local attacker to cause a Denial of Service (DoS) by exhausting system resources.	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 2026-08-15 06:40:08 UTC

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

rxrpc: Fix leak of released call in recvmsg(MSG_PEEK)

Fix rxrpc_recvmsg() to also drop the ref it holds on an already-released
call if MSG_PEEK is in force (the function holds a ref on the call
irrespective of whether MSG_PEEK is specified or not).

Comment 1 Keith Grant 2026-08-20 22:43:44 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081515-CVE-2026-74432-37b1@gregkh/T