Bug 2025938 (CVE-2021-4150)

Summary:	CVE-2021-4150 kernel: Block subsystem mishandles reference counts
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
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, adscvr, airlied, alciregi, bhu, brdeoliv, bskeggs, chwhite, crwood, dhoward, dvlasenk, fhrbata, fpacheco, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jforbes, jglisse, jlelli, jonathan, josef, jshortt, jstancek, jwboyer, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, steved, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.15 rc7	Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free flaw was found in the add_partition in block/partitions/core.c in the Linux kernel. A local attacker with user privileges could cause a denial of service on the system. The issue results from the lack of code cleanup when device_add call fails when adding a partition to the disk.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-01-18 07:30:39 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:	2026492, 2034666

Description Pedro Sampaio 2021-11-23 12:40:45 UTC

The block subsystem in the Linux kernel before 5.14 mishandles reference counts, which allows local users to cause a denial of service (use-after-free) or possibly have unspecified other impacts via a crafted user space program related to the disk object reference count.

References:

https://lkml.org/lkml/2021/9/6/781
https://lkml.org/lkml/2021/10/18/485

Comment 5 Product Security DevOps Team 2022-01-18 07:30:35 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-2021-4150