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Bug 1243489 - (CVE-2015-3291) CVE-2015-3291 kernel: x86/nmi: malicious userspace programs can cause the kernel to skip NMIs
CVE-2015-3291 kernel: x86/nmi: malicious userspace programs can cause the ker...
Status: CLOSED WONTFIX
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=20150722,reported=2...
: Security
Depends On: 1245927
Blocks: 1243491
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Reported: 2015-07-15 10:54 EDT by Martin Prpič
Modified: 2015-07-29 11:15 EDT (History)
23 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was found that if a Non-Maskable Interrupt (NMI) occurred immediately after a SYSCALL call or before a SYSRET call with the user RSP pointing to the NMI IST stack, the kernel could skip that NMI.
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Last Closed: 2015-07-23 02:55:47 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Martin Prpič 2015-07-15 10:54:51 EDT 
It was found that if an NMI occurred immediately after a SYSCALL or before a SYSRET with the user RSP pointing to the NMI IST stack, the kernel could skip that NMI.

Upstream fix:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=810bc075f78ff2c221536eb3008eac6a492dba2d

Acknowledgements:

Red Hat would like to thank Andy Lutomirski for reporting this issue.
Comment 1 Petr Matousek 2015-07-23 02:55:47 EDT 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6 as they did not backport the nested NMI handler functionality.

This issue does affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2. This has been rated as having Low security impact and is not currently planned to be addressed in future updates.
Comment 2 Petr Matousek 2015-07-23 02:57:34 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1245927]
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