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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel Crash in tcp_collapse() Lets Local Users Cause Denial of Service Conditions on the Target System
SecurityTracker Alert ID:  1037285
SecurityTracker URL:  http://securitytracker.com/id/1037285
CVE Reference:   CVE-2016-8645   (Links to External Site)
Date:  Nov 14 2016
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0 and later
Description:   A vulnerability was reported in the Linux kernel. A local user can cause denial of service conditions on the target system.

A local user can issue multiple specially crafted system calls to trigger a crash in tcp_collapse() and cause denial of service conditions on the target system.

[Editor's note: The report indicates that commit c9c3321257 in version 4.9-rc1 that provides a larger queue to better accommodate SACK backlogs is a workaround for this vulnerability.]

Marco Grassi reported this vulnerability.

Impact:   A local user can cause denial of service conditions on the target system.
Solution:   A proposed patch is available at:

http://marc.info/?l=linux-netdev&m=147881236332369&w=2

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   State error

Message History:   None.


 Source Message Contents

Subject:  [oss-security] CVE-2016-8645: linux kernel: net: a BUG() statement can be hit in net/ipv4/tcp_input.c

Hello,

Let me please inform that it was discovered by Marco
Grassi <marco.gra@gmail.com> (many thanks) that the
Linux kernels since at least v4.0 are crashing in
tcp_collapse() after making a number of certain syscalls.

RHEL-7 kernels (3.10.0-xxx) are not vulnerable. Also,
the upstream kernels since v4.9-rc1 are not vulnerable too,
as they have the commit c9c3321257. Unfortunately, this
commit is not fix, but just a workaround. I'm not aware
of any fix as of now.

CVE-2016-8645 was assigned to this flaw internally by
the Red Hat, please, use this CVE-ID in communications
regarding this flaw.

Discussion at stable@:

http://www.spinics.net/lists/stable/msg150470.html

Discussion at netdev@:

http://www.spinics.net/lists/netdev/msg403701.html

http://marc.info/?l=linux-netdev&m=147878925724283&w=2

http://marc.info/?t=147878927800005&r=1&w=2 # the whole thread

Red Hat public BZ:

https://bugzilla.redhat.com/show_bug.cgi?id=1393904

Best regards,
Vladis Dronov | Red Hat, Inc. | Product Security Engineer
 
 


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