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Bug 1553911 - (CVE-2018-7995) CVE-2018-7995 kernel: Race condition in the store_int_with_restart() function in cpu/mcheck/mce.c
CVE-2018-7995 kernel: Race condition in the store_int_with_restart() function...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20180309,reported=2...
: Security
Depends On: 1553918
Blocks: 1553913
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Reported: 2018-03-09 16:04 EST by Pedro Sampaio
Modified: 2018-03-26 14:56 EDT (History)
47 users (show)

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Doc Text:
A race condition in the store_int_with_restart() function in arch/x86/kernel/cpu/mcheck/mce.c in the Linux kernel allows local users to cause a denial of service (panic) by leveraging root access to write to the check_interval file in a /sys/devices/system/machinecheck/machinecheck<cpu number> directory.
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Clone Of:
Environment:
Last Closed: 2018-03-22 07:47:45 EDT
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Regression: ---
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Pedro Sampaio 2018-03-09 16:04:02 EST 
Race condition in the store_int_with_restart() function in arch/x86/kernel/cpu/mcheck/mce.c in the Linux kernel allows local users to cause a denial of service (panic) by leveraging root access to write to the check_interval file in a /sys/devices/system/machinecheck/machinecheck<cpu number> directory.

References:

https://lkml.org/lkml/2018/3/2/970

An upsteam patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3b7c4795ccab5be71f080774c45bbbcc75c2aaf
Comment 1 Pedro Sampaio 2018-03-09 16:20:12 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1553918]
Comment 2 Fedora Update System 2018-03-16 12:18:33 EDT 
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.
Comment 4 Vladis Dronov 2018-03-22 07:42:57 EDT 
Notes:

Since only root can write to the mentioned sysfs variables, the issue is not a security flaw.
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