Bug 2320239 (CVE-2024-47737)

Summary:	CVE-2024-47737 kernel: nfsd: call cache_put if xdr_reserve_space returns NULL
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:	dfreiber, drow, jburrell, rhel-process-autobot, vkumar, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel's Network File System Daemon (nfsd) component. This vulnerability occurs when the system attempts to allocate buffer space but fails, yet a related lookup operation succeeds. This leads to a resource leak where a cache entry is acquired but not properly released. A local attacker could exploit this issue 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:
Bug Depends On:	2320382
Bug Blocks:

Description OSIDB Bzimport 2024-10-21 13:04:40 UTC

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

nfsd: call cache_put if xdr_reserve_space returns NULL

If not enough buffer space available, but idmap_lookup has triggered
lookup_fn which calls cache_get and returns successfully. Then we
missed to call cache_put here which pairs with cache_get.

Reviwed-by: Jeff Layton <jlayton>

Comment 1 Robb Gatica 2024-10-21 15:49:09 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024102108-CVE-2024-47737-b77e@gregkh/T

Comment 2 errata-xmlrpc 2025-05-13 08:29:15 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:6966 https://access.redhat.com/errata/RHSA-2025:6966