Bug 2119855 (CVE-2022-36879)

Summary:	CVE-2022-36879 kernel: xfrm_expand_policies() in net/xfrm/xfrm_policy.c can cause a refcount to be dropped twice
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, bhu, brdeoliv, bskeggs, chwhite, ddepaula, debarbos, dvlasenk, hdegoede, hkrzesin, hpa, jarod, jarodwilson, jburrell, jfaracco, jferlan, jforbes, jglisse, jlelli, joe.lawrence, jonathan, josef, jreznik, jshortt, jstancek, jwboyer, jwyatt, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lleshchi, lxin, lzampier, masami256, mcascell, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, scweaver, sdubroca, sgrubb, steved, sukulkar, swood, tyberry, vkumar, walters, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.19-rc8	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). An error while resolving policies in xfrm_bundle_lookup causes the refcount to drop twice, leading to a possible crash and a denial of service.	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:	2183128, 2183130, 2119856, 2122185, 2122186, 2122187, 2122188, 2183129, 2183131
Bug Blocks:	2111787

Description Guilherme de Almeida Suckevicz 2022-08-19 16:46:32 UTC

An issue was discovered in the Linux kernel through 5.18.14. xfrm_expand_policies in net/xfrm/xfrm_policy.c can cause a refcount to be dropped twice.

Reference and upstream patch:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=f85daf0e725358be78dfd208dea5fd665d8cb901

Comment 1 Guilherme de Almeida Suckevicz 2022-08-19 16:46:58 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2119856]

Comment 2 Justin M. Forbes 2022-08-22 21:12:15 UTC

This was fixed for Fedora with the 5.18.15 stable kernel updates.