Bug 1084755 (CVE-2018-7995)

Summary:	VUL-0: CVE-2018-7995: kernel: Race condition in the store_int_with_restart() function in arch/x86/kernel/cpu/mcheck/mce.c in the Linux kernel through 4.15.7 allows local users to cause a denial of service (panic)
Product:	[Novell Products] SUSE Security Incidents	Reporter:	Karol Babioch <karol>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED INVALID	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	bpetkov, meissner, smash_bz, tiwai
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/201551/
Whiteboard:	CVSSv3:SUSE:CVE-2018-7995:5.5:(AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description Karol Babioch 2018-03-09 19:11:32 UTC

CVE-2018-7995

Race condition in the store_int_with_restart() function in
arch/x86/kernel/cpu/mcheck/mce.c in the Linux kernel through 4.15.7 allows local
users to cause a denial of service (panic) by leveraging root access to write to
/sys/devices/system/machinecheck/machinecheck<cpu number> (aka the
check_interval file)

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-7995
https://lkml.org/lkml/2018/3/2/970
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=b3b7c4795ccab5be71f080774c45bbbcc75c2aaf

Comment 3 Marcus Meissner 2018-03-14 15:31:33 UTC

Since only root can write to those sysfs variables, the issue is not a
seems not be security relevant.

Comment 6 Marcus Meissner 2019-02-12 06:42:29 UTC

we will not be fixing this issue.