Bug 2048492 (CVE-2022-24122)

Summary:	CVE-2022-24122 kernel: use-after-free and privilege escalation in kernel/ucount.c when unprivileged user namespaces are enabled
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
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, bhu, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jfaracco, jforbes, jglisse, jlelli, joe.lawrence, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, ptalbert, qzhao, rkeshri, rvrbovsk, scweaver, steved, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.17 rc2	Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free vulnerability was found in the Linux kernel’s alloc_ucounts in the kernel/ucount.c function. This flaw allows a local attacker with unprivileged user namespaces to cause a privilege escalation problem.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-17 12:15:14 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:	2048493, 2048624, 2048626, 2049040
Bug Blocks:	2048495

Description Marian Rehak 2022-01-31 11:18:37 UTC

A use-after-free vulnerability was found in alloc_ucounts in kernel/ucount.c in the Linux kernel. In this flaw, a local attacker with unprivileged user namespaces may lead to a privilege escalation problem.


Reference:

https://www.openwall.com/lists/oss-security/2022/01/29/1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f9d87929d451d3e649699d0f1d74f71f77ad38f5

Comment 1 Marian Rehak 2022-01-31 11:21:26 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2048493]

Comment 6 Product Security DevOps Team 2022-05-17 12:15:10 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-2022-24122