Bug 1775724 (CVE-2019-19077)

Summary:	CVE-2019-19077 kernel: memory leak in bnxt_re_create_srq function in drivers/infiniband/hw/bnxt_re/ib_verbs.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, airlied, akarlsso, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, gcase, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, jtoppins, jwboyer, kernel-maint, kernel-mgr, lgoncalv, linville, masami256, mchehab, mcressma, mjg59, mlangsdo, nmurray, qzhao, rt-maint, rvrbovsk, steved, williams, yozone
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 memory leak flaw was found in the Broadcom NetXtreme HCA driver in the Linux kernel, in the way it handled resource cleanup on the copy to userspace error. This flaw allows a local attacker to trigger this error and crash the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-25 22:12:51 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:	1724772, 1775725, 1829254, 1829255, 1829256, 1829257
Bug Blocks:	1775726

Description Guilherme de Almeida Suckevicz 2019-11-22 16:33:49 UTC

A memory leak in the bnxt_re_create_srq() function in drivers/infiniband/hw/bnxt_re/ib_verbs.c in the Linux kernel through 5.3.11 allows attackers to cause a denial of service (memory consumption) by triggering copy to udata failures, aka CID-4a9d46a9fe14.

Upstream commit:
https://github.com/torvalds/linux/commit/4a9d46a9fe14401f21df69cea97c62396d5fb053

Comment 1 Guilherme de Almeida Suckevicz 2019-11-22 16:34:18 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1775725]

Comment 2 Justin M. Forbes 2019-11-27 17:32:15 UTC

This is fixed for Fedora in the 5.3.13 stable kernel update.

Comment 5 Petr Matousek 2020-04-29 10:12:09 UTC

Statement:

This issue is rated as having Moderate impact because local attacker is needed in order to trigger it.

Comment 6 Petr Matousek 2020-04-29 10:12:18 UTC

Mitigation:

In order to mitigate this issue it is possible to prevent the affected code from being loaded by blacklisting the kernel module bnxt_re. For instructions relating to how to blacklist a kernel module refer to: https://access.redhat.com/solutions/41278 .