Bug 2219272 (CVE-2023-4385)

Summary:	CVE-2023-4385 kernel: jfs: NULL pointer dereference in dbFree()
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, allarkin, bhu, chwhite, crwood, dbohanno, ddepaula, debarbos, dfreiber, dvlasenk, ezulian, hkrzesin, jarod, jburrell, jdenham, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, ldoskova, lgoncalv, lleshchi, lzampier, nmurray, ptalbert, qzhao, rkeshri, rogbas, rrobaina, rvrbovsk, rysulliv, scweaver, security-response-team, tglozar, tyberry, vkumar, walters, wcosta, williams, wmealing, ycote, ymankad
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Kernel 5.19-rc1	Doc Type:	If docs needed, set a value
Doc Text:	A NULL pointer dereference flaw was found in dbFree in fs/jfs/jfs_dmap.c in the journaling file system (JFS) in the Linux Kernel. This issue may allow a local attacker to crash the system due to a missing sanity check.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-08-16 20:20:57 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:	2219283, 2219284
Bug Blocks:	2219643

Description Dhananjay Arunesh 2023-07-03 07:08:51 UTC

A NULL pointer dereference flaw was found in dbFree in fs/jfs/jfs_dmap.c in  journaling file system (JFS) in the Linux Kernel. In this flaw, a local attacker may crash the system due to a missing sanity check.

In our fault-injection testing, the variable "nblocks" in dbFree() can be zero when kmalloc_array() fails in dtSearch(). In this case, the  variable "mp" in dbFree() would be NULL and then it is dereferenced in  "write_metapage(mp)".

References:
https://github.com/torvalds/linux/commit/0d4837fdb796f99369cf7691d33de1b856bcaf1f

Comment 5 Rohit Keshri 2023-08-16 16:34:05 UTC

The affected code was not introduced into any kernel versions shipped with Red Hat Enterprise Linux (except RHEL6) making this vulnerable not applicable to these platforms.

Comment 8 Product Security DevOps Team 2023-08-16 20:20:54 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-2023-4385