Bug 2192175 (CVE-2023-2430)

Summary:	CVE-2023-2430 kernel: missing lock in io_uring/msg_ring.c for IOPOLL in io_uring cause denial of service
Product:	[Other] Security Response	Reporter:	Rohit Keshri <rkeshri>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, allarkin, bhu, chwhite, crwood, dbohanno, ddepaula, debarbos, dfreiber, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jcerny, jdenham, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, ldoskova, lgoncalv, lleshchi, lzampier, mmarhefk, nmurray, ptalbert, qzhao, rogbas, rrobaina, rvrbovsk, rysulliv, scweaver, tyberry, vkumar, vpolasek, walters, wcosta, williams, wmealing, ycote
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Kernel 6.2 RC5	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found due to a missing lock for the IOPOLL in io_cqring_event_overflow() in io_uring.c in the Linux kernel. This flaw allows a local attacker with user privileges to trigger a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-04-30 11:40:21 UTC	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:
Bug Blocks:	2172289

Description Rohit Keshri 2023-04-30 06:37:13 UTC

A vulnerability due to missing lock on overflow for IOPOLL bug in io_cqring_event_overflow() in io_uring.c in Linux kernel through v6.2-rc5, which allows an attacker to trigger Denial of Service.

This bug has already been reported to kernel developers early in January
and Jens has done a patch: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e12d7a46f65ae4b7d58a5e0c1cbfa825cf8

The earliest reports can be found at:
https://groups.google.com/g/syzkaller/c/T04q4HMUCdA/m/qVaOqv2RAAAJ

Comment 1 Product Security DevOps Team 2023-04-30 11:40:17 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2023-2430