CVE-2019-20096

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-12-30 · updated 2026-06-17
Weakness: CWE-401

Description

In the Linux kernel before 5.1, there is a memory leak in __feat_register_sp() in net/dccp/feat.c, which may cause denial of service, aka CID-1d3ff0950e2b.

Affected products

Canonical Ubuntu Linux: 14.04, 16.04, 18.04
Debian Linux: 8.0
Linux kernel: before 5.1 — fixed in 5.1

How to fix

Upgrade to a fixed version: Linux kernel 5.1. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
http://packetstormsecurity.com/files/156455/Kernel-Live-Patch-Security-Notice-LSN-0063-1.html
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1d3ff0950e2b40dc861b1739029649d03f591820
https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
https://usn.ubuntu.com/4285-1/
https://usn.ubuntu.com/4286-1/
https://usn.ubuntu.com/4286-2/
https://usn.ubuntu.com/4287-1/
https://usn.ubuntu.com/4287-2/
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
http://packetstormsecurity.com/files/156455/Kernel-Live-Patch-Security-Notice-LSN-0063-1.html

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