CVE-2019-11479

NameCVE-2019-11479
DescriptionJonathan Looney discovered that the Linux kernel default MSS is hard-coded to 48 bytes. This allows a remote peer to fragment TCP resend queues significantly more than if a larger MSS were enforced. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commits 967c05aee439e6e5d7d805e195b3a20ef5c433d6 and 5f3e2bf008c2221478101ee72f5cb4654b9fc363.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1823-1, DLA-1824-1, DSA-4465-1
NVD severitymedium (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)jessie3.16.56-1+deb8u1vulnerable
jessie (security)3.16.74-1fixed
stretch4.9.189-3fixed
stretch (security)4.9.189-3+deb9u1fixed
buster4.19.67-2fixed
buster (security)4.19.67-2+deb10u1fixed
bullseye, sid5.2.17-1fixed
linux-4.9 (PTS)jessie (security)4.9.189-3+deb9u1~deb8u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.19.37-4medium
linuxsourcejessie3.16.68-2mediumDLA-1823-1
linuxsourcestretch4.9.168-1+deb9u3mediumDSA-4465-1
linux-4.9sourcejessie4.9.168-1+deb9u3~deb8u1mediumDLA-1824-1

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