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Date: Tue, 13 Oct 2020 10:23:52 -0700
From: Steve Beattie <>
Subject: CVE-2020-16119 - Linux kernel DCCP CCID structure use-after-free


CVE-2020-16119 - Linux kernel DCCP CCID structure use-after-free

Hadar Manor reported that by reusing a DCCP socket with an attached
dccps_hc_tx_ccid as a listener, it will be used after being released,
leading to a denial of service or possibly code execution.

It was introduced by:

 2677d20677314101293e6da0094ede7b5526d2b1 "dccp: don't free
 ccid2_hc_tx_sock struct in dccp_disconnect()"

Proposed fixes have been posted to:

To mitigate this on systems that have DCCP enabled but do not
use it, block module autoloading via adding the following to

   alias net-pf-2-proto-0-type-6 off
   alias net-pf-2-proto-33-type-6 off
   alias net-pf-10-proto-0-type-6 off
   alias net-pf-10-proto-33-type-6 off

Alternatively, to prevent the dccp module from being loaded entirely,

  blacklist dccp
  install dccp /bin/false


Steve Beattie

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