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Bug 1415733 - (CVE-2017-5546) CVE-2017-5546 kernel: SLAB freelist randomization produces duplicate entries
CVE-2017-5546 kernel: SLAB freelist randomization produces duplicate entries
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20170111,repor...
: Security
Depends On:
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Reported: 2017-01-23 10:10 EST by Adam Mariš
Modified: 2017-01-24 10:01 EST (History)
32 users (show)

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Fixed In Version: kernel 4.9.5
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Last Closed: 2017-01-24 10:01:28 EST
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Description Adam Mariš 2017-01-23 10:10:11 EST 
A bug in freelist randomization code was found resulting into freelist containing duplicate entries when high random number is used. This will result in different allocations sharing the same chunk which can cause odd behaviours and crashes.

This affects kernel versions >= 4.8 when CONFIG_SLAB_FREELIST_RANDOM is enabled.

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c4e490cf148e85ead0d1b1c2caaba833f1d5b29f

CVE assignment:

http://seclists.org/oss-sec/2017/q1/161
Comment 1 Justin M. Forbes 2017-01-23 17:00:17 EST 
This was fixed in stable update 4.9.5 which is currently on all supported Fedora releases
Comment 2 Adam Mariš 2017-01-24 10:01:28 EST 
(In reply to Justin M. Forbes from comment #1)
> This was fixed in stable update 4.9.5 which is currently on all supported
> Fedora releases

Thanks, marking as not affected then.
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