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Category:   OS (Linux)  >   Linux Kernel Vendors:
Linux Kernel Crash in tcp_collapse() Lets Local Users Cause Denial of Service Conditions on the Target System
SecurityTracker Alert ID:  1037285
SecurityTracker URL:
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:

Vendor URL: (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


Let me please inform that it was discovered by Marco
Grassi <> (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@:

Discussion at netdev@: # the whole thread

Red Hat public BZ:

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

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