Bug 1554199 (CVE-2018-8043)

Summary:	CVE-2018-8043 kernel: NULL pointer dereference in drivers/net/phy/mdio-bcm-unimac.c:unimac_mdio_probe() can lead to denial of service
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, ewk, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jkacur, john.j5live, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, linville, mchehab, mcressma, mjg59, mlangsdo, nmurray, rt-maint, rvrbovsk, skozina, slawomir, steved, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.16-rc1	Doc Type:	If docs needed, set a value
Doc Text:	The Linux kernel was found vulnerable to a NULL pointer dereference in the drivers/net/phy/mdio-bcm-unimac.c:unimac_mdio_probe() function caused by an unchecked return value from the platform_get_resource() function. A successful flaw exploitation can cause a system panic and a denial of service. This flaw is believed not to be an attacker triggerable as bad return value can be caused by hardware misconfiguration.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-27 10:54:30 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:	1554200, 1556978, 1556979
Bug Blocks:	1554204

Description Sam Fowler 2018-03-12 04:03:39 UTC

The Linux kernel was found vulnerable to a NULL pointer dereference in the drivers/net/phy/mdio-bcm-unimac.c:unimac_mdio_probe() function caused by an unchecked return value from the platform_get_resource() function. A successful flaw exploitation can cause a system panic and a denial of service. This flaw is believed not to be an attacker triggerable as bad return value can be caused by hardware misconfiguration.

References:

https://marc.info/?l=kernel-janitors&m=151566944123938&w=2

An upstream fix:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=297a6961ffb8ff4dc66c9fbf53b924bd1dda05d5

Comment 1 Sam Fowler 2018-03-12 04:04:40 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1554200]

Comment 6 Fedora Update System 2018-03-16 16:18:01 UTC

kernel-4.15.9-200.fc26 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.