Bug 1961292 (CVE-2019-25044)

Summary:	CVE-2019-25044 kernel: use-after-free in the block subsystem related to blk_mq_free_rqs and blk_cleanup_queue
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, bmasney, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarodwilson, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, steved, tomckay, walters, wcosta, williams
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. The block subsystem has a use-after-free that can lead to arbitrary code execution in the kernel context and privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-06-01 15:09:59 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:	1961293
Bug Blocks:	1961294

Description Guilherme de Almeida Suckevicz 2021-05-17 16:20:08 UTC

The block subsystem in the Linux kernel before 5.2 has a use-after-free that can lead to arbitrary code execution in the kernel context and privilege escalation. This is related to blk_mq_free_rqs and blk_cleanup_queue.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c3e2219216c92919a6bd1711f340f5faa98695e6

Comment 1 Guilherme de Almeida Suckevicz 2021-05-17 16:20:57 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1961293]

Comment 2 Justin M. Forbes 2021-05-17 20:27:58 UTC

This was fixed for Fedora with the 5.2 stable kernel rebases.