CVE-2019-11477 (/proc/sys/net/ipv4/tcp_sack)

["David C. Rankin" <drankinatty@xxxxxxxxxxxxxxxxxx>]

After 5.12.1 is there any further mitigation needed for:


https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11477

related:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11478
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11479

  Suggested work-around:

echo 0 > /proc/sys/net/ipv4/tcp_sack

  or

iptables -A INPUT -p tcp -m tcpmss --mss 1:500 -j DROP

Are either needed after latest kernel, or is this resolved?

-- 
David C. Rankin, J.D.,P.E.