Bug 1500391 - (CVE-2017-15274) CVE-2017-15274 kernel: dereferencing NULL payload with nonzero length
CVE-2017-15274 kernel: dereferencing NULL payload with nonzero length
Status: NEW
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=20170608,repor...
: Security
Depends On: 1502907 1502908 1502909 1502910 1502911 1502912 1502906
Blocks: 1500394
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Reported: 2017-10-10 09:31 EDT by Adam Mariš
Modified: 2018-07-19 02:35 EDT (History)
48 users (show)

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Fixed In Version: kernel 4.12
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the implementation of associative arrays where the add_key systemcall and KEYCTL_UPDATE operations allowed for a NULL payload with a nonzero length. When accessing the payload within this length parameters value, an unprivileged user could trivially cause a NULL pointer dereference (kernel oops).
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Description Adam Mariš 2017-10-10 09:31:18 EDT
A flaw was found in the linux kernels implementation of associative arrays.  The add_key systemcall and KEYCTL_UPDATE operations allowed for a NULL payload with a nonzero length.  When accessing the payload within this length parameters value, an unprivileged user could trivially cause a NULL pointer dereference (kernel oops).

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5649645d725c73df4302428ee4e02c869248b4c5
Comment 2 Wade Mealing 2017-10-17 01:13:34 EDT
Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise
Linux 5,6,7, MRG-2 and realtime kernels.

Red Hat Enterprise Linux 5 has transitioned to Production phase 3.  
During the Production 3 Phase, Critical impact Security Advisories (RHSAs) 
and selected Urgent Priority Bug Fix Advisories (RHBAs) may be released 
as they become available.

At this time this bug is not meet this critera and is unlikley to be fixed
for these releases.

The official life cycle policy can be reviewed here:

http://redhat.com/rhel/lifecycle

Future Linux kernel updates for the products in production phase 1 and 2, namely Red Hat Enterprise
Linux 6, 7 and MRG-2 may address this issue.

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