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Bug 1597759 - (CVE-2018-12896) CVE-2018-12896 kernel: Integer overflow in kernel/time/posix-timers.c
CVE-2018-12896 kernel: Integer overflow in kernel/time/posix-timers.c
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=none,public=20180622,reported=...
: Security
Depends On: 1597762 1597760
Blocks: 1597761
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Reported: 2018-07-03 10:53 EDT by Laura Pardo
Modified: 2018-08-02 11:03 EDT (History)
45 users (show)

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Doc Text:
An issue was discovered in the Linux kernel where an integer overflow in kernel/time/posix-timers.c in the POSIX timer code is caused by the way the overrun accounting works. Depending on interval and expiry time values, the overrun can be larger than INT_MAX, but the accounting is int based. This basically makes the accounting values, which are visible to user space via timer_getoverrun(2) and siginfo::si_overrun, random.
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Environment:
Last Closed: 2018-08-01 09:22:08 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Laura Pardo 2018-07-03 10:53:41 EDT 
An issue was discovered in the Linux kernel. An Integer Overflow in kernel/time/posix-timers.c in the POSIX timer code is caused by the way the overrun accounting works. Depending on interval and expiry time values, the overrun can be larger than INT_MAX, but the accounting is int based. This basically makes the accounting values, which are visible to user space via timer_getoverrun(2) and siginfo::si_overrun, random.

References:

https://bugzilla.kernel.org/show_bug.cgi?id=200189 	

https://github.com/lcytxw/bug_repro/tree/master/bug_200189 	

https://marc.info/?t=153003602900042&r=1&w=2

https://marc.info/?t=153003602700045&r=1&w=2

A suggested upstream patch:

https://github.com/torvalds/linux/commit/78c9c4dfbf8c04883941445a195276bb4bb92c76
Comment 1 Laura Pardo 2018-07-03 10:55:10 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1597760]
Comment 6 Vladis Dronov 2018-08-01 09:22:08 EDT 
Note:

This bug is present in certain Red Hat products, but the security impact is absent. Therefore, we do not consider this bug to be a security flaw.
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