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Bug 1590215 - (CVE-2018-12232) CVE-2018-12232 kernel: NULL pointer dereference if close and fchownat system calls share a socket file descriptor
CVE-2018-12232 kernel: NULL pointer dereference if close and fchownat system ...
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=20180604,repor...
: Security
Depends On: 1590217 1590216 1591837
Blocks: 1590219
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Reported: 2018-06-12 04:38 EDT by Andrej Nemec
Modified: 2018-10-30 05:02 EDT (History)
43 users (show)

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Doc Text:
A NULL pointer dereference issue was found in the Linux kernel. If the close() and fchownat() system calls share a socket file descriptor as an argument, then the two calls can race and trigger a NULL pointer dereference leading to a system crash and a denial of service.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2948 None None None 2018-10-30 05:02 EDT

  None (edit)
Description Andrej Nemec 2018-06-12 04:38:36 EDT 
A NULL pointer dereference issue was found in the Linux kernel. If the close() and fchownat() system calls share a socket file descriptor as an argument, then the two calls can race and trigger a NULL pointer dereference leading to a system crash and a denial of service.

References:

https://lkml.org/lkml/2018/6/5/14

https://marc.info/?t=152817459500001&r=1&w=2

https://patchwork.ozlabs.org/patch/926519/

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6d8c50dcb029872b298eea68cc6209c866fd3e14
Comment 1 Andrej Nemec 2018-06-12 04:39:33 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1590216]
Comment 6 errata-xmlrpc 2018-10-30 05:01:56 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2948 https://access.redhat.com/errata/RHSA-2018:2948
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