Bug 1784920 (CVE-2019-19815)

Summary:	CVE-2019-19815 kernel: NULL pointer dereference in f2fs_recover_fsync_data in fs/f2fs/recovery.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
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, airlied, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jglisse, jlelli, john.j5live, jonathan, josef, jross, jschorr, jshortt, jstancek, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, masami256, matt, mchehab, mcressma, mjg59, mlangsdo, nmurray, qzhao, rkeshri, rt-maint, rvrbovsk, steved, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A NULL pointer dereference flaw was found in F2FS_P_SB in fs/f2fs/f2fs.h in the F2FS filesystem exploiting the NAND flash memory-based storage device. This flaw allows an attacker to crash the system or leak internal kernel information.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-07 16:31:53 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:	1784921
Bug Blocks:	1784922

Description Guilherme de Almeida Suckevicz 2019-12-18 17:53:43 UTC

A NULL pointer dereference flaw was found in F2FS_P_SB in fs/f2fs/f2fs.h in F2FS filesystem exploiting NAND flash memory-based storage device. This flaw could allow an attacker to crash the system or leak internal kernel information.

Reference:
https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19815

Upstream commit:
https://github.com/torvalds/linux/commit/4969c06a0d83c9c3dc50b8efcdc8eeedfce896f6#diff-41a7fa4590d2af87e82101f2b4dadb56

Comment 1 Guilherme de Almeida Suckevicz 2019-12-18 17:54:28 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1784921]

Comment 2 Justin M. Forbes 2019-12-19 15:20:42 UTC

This is fixed for Fedora with the 5.3.x kernel rebases.

Comment 5 Rohit Keshri 2020-04-07 10:57:22 UTC

Mitigation:

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Comment 6 Rohit Keshri 2020-04-07 10:58:05 UTC

Statement:

There was no shipped kernel version were seen affected with this problem. These files are not built in our source code.

Comment 8 Product Security DevOps Team 2020-04-07 16:31:53 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-2019-19815