CVE-2016-5696

Priority
Description
net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly
determine the rate of challenge ACK segments, which makes it easier for
remote attackers to hijack TCP sessions via a blind in-window attack.
Ubuntu-Description
Yue Cao et al discovered a flaw in the TCP implementation's handling of
challenge acks in the Linux kernel. A remote attacker could use this to
cause a denial of service (reset connection) or inject content into an TCP
stream.
Notes
 jdstrand> android kernels (flo, goldfish, grouper, maguro, mako and manta) are
  not supported on the Ubuntu Touch 14.10 and earlier preview kernels
 jdstrand> linux-lts-saucy no longer receives official support
 jdstrand> linux-lts-quantal no longer receives official support
 sbeattie>
 sbeattie> MITIGATION: setting the net.ipv4.tcp_challenge_ack_limit
  sysctl to some absurdly large number (as described in the lwn
  article referenced above)
 sbeattie> fix is going to land in Ubuntu kernels in this SRU cycle,
  with a likely release date of Aug 27. Earlier access to the kernels
  with the fix will be available from the -proposed pocket, though they
  come with the risk of being less tested.
Package
Source: linux (LP Ubuntu Debian)
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):released (3.2.0-109.150)
Ubuntu 14.04 LTS (Trusty Tahr):released (3.13.0-95.142)
Ubuntu 16.04 LTS (Xenial Xerus):released (4.4.0-36.55)
Patches:
Introduced by 282f23c6ee343126156dd41218b22ece96d747e3Fixed by 75ff39ccc1bd5d3c455b6822ab09e533c551f758
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE (precise was released [3.2.0-1672.98])
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):not-affected (4.4.0-1002.2)
Ubuntu 16.04 LTS (Xenial Xerus):not-affected (4.4.0-1001.10)
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 16.04 LTS (Xenial Xerus):not-affected
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):not-affected (4.4.0-1003.3)
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 16.04 LTS (Xenial Xerus):ignored (abandoned)
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):not-affected (4.8.0-36.36~16.04.1)
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):not-affected (4.8.0-36.36~16.04.1)
Package
linux-krillin:ignored (was needed now end-of-life)
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE (precise was ignored [abandoned])
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE (precise was ignored [abandoned])
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE (precise was ignored [abandoned])
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE (precise was ignored [end-of-life])
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Patches:
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE (precise was ignored [end-of-life])
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE (precise was ignored [end-of-life])
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):released (3.13.0-95.142~precise1)
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (end-of-life)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):released (3.19.0-68.76~14.04.1)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored (end-of-life)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):released (4.4.0-36.55~14.04.1)
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 16.04 LTS (Xenial Xerus):not-affected
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE (precise was ignored [abandoned])
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):released (4.4.0-1021.27)
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):released (4.4.0-1024.27)
Package
Upstream:released (4.7)
Ubuntu 12.04 ESM (Precise Pangolin):DNE (precise was released [3.2.0-1487.114])
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 16.04 LTS (Xenial Xerus):DNE
Package
linux-vegetahd:ignored (was needed now end-of-life)
More Information

Updated: 2019-03-19 12:26:50 UTC (commit 15472795df7e9de45b82f2d36b8b419b939f97b2)