Bug 2281713 (CVE-2024-35880)

Summary:	CVE-2024-35880 kernel: io_uring/kbuf: hold io_buffer_list reference over mmap
Product:	[Other] Security Response	Reporter:	ybuenos
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	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 6.6.26, kernel 6.8.5, kernel 6.9	Doc Type:	If docs needed, set a value
Doc Text:	CVE-2024-35880 is a vulnerability in the Linux kernel's io_uring subsystem, specifically related to how kernel buffers (kbuf) are handled during memory mapping (mmap) operations. The flaw stems from a situation where a buffer can be unregistered prematurely while it is still being used, leading to a potential use-after-free issue. The io_uring mechanism uses the Read-Copy-Update (RCU) method to manage buffers during mmap. However, the absence of a strong reference to the buffer during operations allows it to be unregistered while still in use. This can result in memory dereferencing errors, leading to crashes or unpredictable behavior.	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:	2281715
Bug Blocks:	2281751

Description ybuenos 2024-05-20 12:15:55 UTC

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

io_uring/kbuf: hold io_buffer_list reference over mmap

The Linux kernel CVE team has assigned CVE-2024-35880 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024051944-CVE-2024-35880-6ffb@gregkh/T

Comment 1 ybuenos 2024-05-20 12:16:40 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2281715]

Comment 3 Alex 2024-06-09 15:33:31 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2024-35880 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is approximation based on flags READ LOCK INIT  ; these flags parsed automatically based on patche 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 8 errata-xmlrpc 2024-11-12 09:30:34 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