Bug 2281684 (CVE-2024-35892)

Summary: CVE-2024-35892 kernel: net/sched: fix lockdep splat in qdisc_tree_reduce_backlog()
Product: [Other] Security Response Reporter: ybuenos
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: acaringi, allarkin, aquini, bhu, chwhite, cye, cyin, dbohanno, debarbos, dfreiber, drow, dvlasenk, esandeen, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, ldoskova, lgoncalv, lzampier, mleitner, mmilgram, mstowell, nmurray, ptalbert, rparrazo, rrobaina, rvrbovsk, rysulliv, scweaver, sidakwo, sukulkar, tglozar, tyberry, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: kernel 6.1.85, kernel 6.6.26, kernel 6.8.5, kernel 6.9 Doc Type: If docs needed, set a value
Doc Text:
CVE-2024-35892 is a vulnerability in the Linux kernel’s network scheduler caused by improper use of the qdisc_lookup() function. This function assumes the global RTNL lock is held, but in the qdisc_tree_reduce_backlog() function, only a local queue lock is used. This mismatch creates a race condition that could lead to system instability or crashes. The issue has been fixed by replacing qdisc_lookup() with an RCU-safe version that works correctly in this context.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2281685    
Bug Blocks: 2281751    

Description ybuenos 2024-05-20 11:43:54 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net/sched: fix lockdep splat in qdisc_tree_reduce_backlog()

The Linux kernel CVE team has assigned CVE-2024-35892 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024051949-CVE-2024-35892-0f0c@gregkh/T
Comment 2 ybuenos 2024-05-20 11:44:41 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2281685]
Comment 4 Alex 2024-06-09 14:29:34 UTC 
The result of automatic check (that is developed by Alexander Larkin) for this CVE-2024-35892 is: 	SKIP	The Fixes patch not applied yet, so unlikely that actual: d636fc5dd692c8f4e00ae6e0359c0eceeb5d9bdb	YES			NO	YES	unknown	 (where first YES/NO value means if related sources built).
Comment 5 errata-xmlrpc 2024-11-12 09:30:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:9315 https://access.redhat.com/errata/RHSA-2024:9315