Bug 1774983 (CVE-2019-19045)

Summary:	CVE-2019-19045 kernel: dos in mlx5_fpga_conn_create_cq() function in drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
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, bdettelb, bhu, blc, brdeoliv, bskeggs, dhoward, dvlasenk, esammons, fhrbata, hdegoede, hkrzesin, iboverma, ichavero, itamar, jarodwilson, jeremy, jforbes, jlelli, john.j5live, jonathan, josef, jross, jshortt, jstancek, 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 flaw was found in the Linux kernel. The Mellanox Technologies Innova driver mishandles resource cleanup on error. An attacker, able to trigger error could use this flaw to crash the system. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-25 22:13:35 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:	1724336, 1774984, 1829455, 1829456
Bug Blocks:	1775022

Description Dhananjay Arunesh 2019-11-21 11:04:25 UTC

A vulnerability was found in Linux Kernel where, a memory leak in the mlx5_fpga_conn_create_cq() function in drivers/net/ethernet/mellanox/mlx5/core/fpga/conn.c allows attackers to cause a denial of service (memory consumption) by triggering mlx5_vector2eqn() failures.

Reference:
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.11
https://github.com/torvalds/linux/commit/c8c2a057fdc7de1cd16f4baa51425b932a42eb39

Comment 1 Dhananjay Arunesh 2019-11-21 11:04:55 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1774984]

Comment 2 Justin M. Forbes 2019-11-21 16:24:43 UTC

This was fixed for Fedora with the 5.3.11 stable kernel update.

Comment 5 Petr Matousek 2020-04-29 14:04:42 UTC

Mitigation:

In order to mitigate this issue it is possible to prevent the affected code from being loaded by blacklisting the kernel module mlx5_core. For instructions relating to how to blacklist a kernel module refer to: https://access.redhat.com/solutions/41278 .

Comment 6 Petr Matousek 2020-04-29 14:08:22 UTC

Statement:

This issue is rated as having Moderate impact because of the privileges needed to trigger the resource cleanup code path.