CVE-2018-5391

Name	CVE-2018-5391
Description	The Linux kernel, versions 3.9+, is vulnerable to a denial of service attack with low rates of specially modified packets targeting IP fragment re-assembly. An attacker may cause a denial of service condition by sending specially crafted IP fragments. Various vulnerabilities in IP fragmentation have been discovered and fixed over the years. The current vulnerability (CVE-2018-5391) became exploitable in the Linux kernel with the increase of the IP fragment reassembly queue size.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-1466-1, DLA-1529-1, DLA-1715-1, DSA-4272-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye (security), bullseye	5.10.223-1	fixed
	bookworm	6.1.106-3	fixed
	bookworm (security)	6.1.99-1	fixed
	sid, trixie	6.10.9-1	fixed

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

Package	Type	Release	Fixed Version	Origin
linux	source	jessie	3.16.59-1	DLA-1529-1
linux	source	stretch	4.9.110-3+deb9u2	DSA-4272-1
linux	source	(unstable)	4.17.15-1
linux-4.9	source	jessie	4.9.144-3.1~deb8u1	DLA-1715-1

Mitigation: Change the default values of net.ipv4.ipfrag_high_thresh and
net.ipv4.ipfrag_low_thresh back to 256kB and 192 kB (respectively) or
below.