Bug 2281827 (CVE-2024-35934)

Summary:	CVE-2024-35934 kernel: net/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list()
Product:	[Other] Security Response	Reporter:	Robb Gatica <rgatica>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	acaringi, allarkin, aquini, bhu, chwhite, dbohanno, debarbos, dfreiber, drow, dvlasenk, esandeen, ezulian, hkrzesin, jarod, jburrell, jfaracco, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, ldoskova, lgoncalv, mleitner, mmilgram, mstowell, nmurray, ptalbert, rhel-process-autobot, rparrazo, rrobaina, rvrbovsk, scweaver, sidakwo, sukulkar, tglozar, vkumar, watson-tool-maintainers, wcosta, williams, wmealing, ycote, ykopkova
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.10.215, kernel 5.15.155, kernel 6.1.86, kernel 6.6.27, kernel 6.8.6, kernel 6.9	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel's Shared Memory Communications (SMC) subsystem. An unprivileged local user can cause a Denial of Service (DoS) by repeatedly creating network namespaces, triggering severe lock contention on core networking locks. This issue occurs because the SMC network initialization routine unnecessarily acquires the routing netlink (rtnl) lock even when no network devices are present, degrading system responsiveness and stalling network operations.	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:	2281828
Bug Blocks:	2282024

Description Robb Gatica 2024-05-20 15:41:36 UTC

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

net/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list()

The Linux kernel CVE team has assigned CVE-2024-35934 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024051917-CVE-2024-35934-c8af@gregkh/T

Comment 1 Robb Gatica 2024-05-20 15:42:15 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2281828]

Comment 5 Alex 2024-06-09 17:28:08 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2024-35934 is: CHECK	Maybe valid. Check manually. with impact LOW (that is an approximation based on flags  ; these flags parsed automatically based on patch data). Such automatic check happens only for Low/Moderates (and only when not from reporter, but parsing already existing CVE). Highs always checked manually (I check it myself and then we check it again in Remediation team). In rare cases some of the Moderates could be increased to High later.

Comment 7 errata-xmlrpc 2025-05-13 08:27:19 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