Bug 2282475 (CVE-2021-47307)

Summary:	CVE-2021-47307 kernel: cifs: prevent NULL deref in cifs_compose_mount_options()
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, scweaver, sidakwo, sukulkar, tglozar, trathi, vkumar, wcosta, williams, wmealing, ycote, ykopkova, zhijwang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.4.135, kernel 5.10.53, kernel 5.13.5, kernel 5.14	Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in the Linux kernel's CIFS module, where the cifs_compose_mount_options() function can dereference a NULL pointer if it encounters a NULL node_name parameter. This issue could potentially lead to system crash or unexpected behavior due to the improper handling of null values.	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:
Bug Blocks:	2282500

Description ybuenos 2024-05-22 12:30:32 UTC

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

cifs: prevent NULL deref in cifs_compose_mount_options()

The Linux kernel CVE team has assigned CVE-2021-47307 to this issue.

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024052127-CVE-2021-47307-f8a6@gregkh/T

Comment 3 Alex 2024-06-09 15:34:23 UTC

The result of automatic check (that is developed by Alexander Larkin) for this CVE-2021-47307 is: CHECK	Maybe valid. Check manually. with impact MODERATE (that is approximation based on flags NULLPTR DISK SIMPLEFIX  ; 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.