Bug 1640598 (CVE-2018-18386) - CVE-2018-18386 kernel: Type confusion in drivers/tty/n_tty.c allows for a denial of service
Summary: CVE-2018-18386 kernel: Type confusion in drivers/tty/n_tty.c allows for a den...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-18386
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: Engineering1650106
Blocks: Embargoed1640599
TreeView+ depends on / blocked
 
Reported: 2018-10-18 11:40 UTC by Andrej Nemec
Modified: 2021-02-16 22:53 UTC (History)
49 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A security flaw was found in the Linux kernel in drivers/tty/n_tty.c which allows local attackers (ones who are able to access pseudo terminals) to lock them up and block further usage of any pseudo terminal devices due to an EXTPROC versus ICANON confusion in TIOCINQ handler.
Clone Of:
Environment:
Last Closed: 2019-06-10 10:40:42 UTC

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:0831 0 None None None 2019-04-23 14:30:29 UTC

Description Andrej Nemec 2018-10-18 11:40:55 UTC 
drivers/tty/n_tty.c in the Linux kernel before 4.14.11 allows local attackers (who are able to access pseudo terminals) to hang/block further usage of any pseudo terminal devices due to an EXTPROC versus ICANON confusion in TIOCINQ.

References:

https://syzkaller.appspot.com/bug?id=17a06459ecad660a3d00c3e41a4b1a7be6bca19e

https://marc.info/?t=151231153300001&r=1&w=2

https://marc.info/?t=151398650400001&r=1&w=2

http://lists.linux.it/pipermail/ltp/2018-May/008071.html

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=966031f340185eddd05affcf72b740549f056348
Comment 5 errata-xmlrpc 2019-04-23 14:30:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:0831 https://access.redhat.com/errata/RHSA-2019:0831
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