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Fencer Vulns
medium 6.3

CVE-2020-16119 json

DCCP CCID structure use-after-free

published 2021-01-14 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-8085

cvss
6.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

Use-after-free vulnerability in the Linux kernel exploitable by a local attacker due to reuse of a DCCP socket with an attached dccps_hc_tx_ccid object as a listener after being released. Fixed in Ubuntu Linux kernel 5.4.0-51.56, 5.3.0-68.63, 4.15.0-121.123, 4.4.0-193.224, 3.13.0.182.191 and 3.2.0-149.196.

Patch / fix

  • Canonical Linux kernel 3.2.0-149.196, 3.13.0.182.191, 4.4.0-193.224, 4.15.0-121.123, 5.3.0-68.63, 5.4.0-51.56
  • linux Debian 14, Debian 13, Debian 12 5.14.6-1

debian advisories DEBIAN-CVE-2020-16119

  • linux Ubuntu 16.04 LTS 4.4.0-193.224
  • linux Ubuntu 18.04 LTS 4.15.0-121.123
  • linux Ubuntu 20.04 LTS 5.4.0-51.56
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1117.131
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1086.91
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1028.29
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1086.98~16.04.1
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1028.29

ubuntu advisories UBUNTU-CVE-2020-16119

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt Real Time Module 15 SP4, openSUSE Leap 15.4 5.14.21-150400.15.5.1
  • kernel-syms-rt Real Time Module 15 SP4, openSUSE Leap 15.4 5.14.21-150400.15.5.1
  • kernel-rt_debug Real Time Module 15 SP4, openSUSE Leap 15.4 5.14.21-150400.15.5.1
  • kernel-source-rt Real Time Module 15 SP4, openSUSE Leap 15.4 5.14.21-150400.15.5.1
  • kernel-rt SLE Micro 5.2, SLE Micro 5.1, Real Time Module 15 SP3 +1 more 5.3.18-150300.106.1
  • kernel-syms-rt Real Time Module 15 SP3 5.3.18-150300.106.1
  • kernel-rt_debug Real Time Module 15 SP3 5.3.18-150300.106.1
  • kernel-source-rt Real Time Module 15 SP3 5.3.18-150300.106.1

suse advisories SUSE-SU-2023:0416-1SUSE-SU-2022:4617-1SUSE-SU-2022:3809-1SUSE-SU-2022:3775-1SUSE-SU-2022:3704-1SUSE-SU-2022:3609-1

  • linux Arch Linux 5.10.2.arch1-1
  • linux-hardened Arch Linux 5.9.9.a-1
  • linux-zen Arch Linux 5.10.2.zen1-1
  • linux-lts Arch Linux 5.4.93-2

arch linux advisories AVG-1244AVG-1245AVG-1246AVG-1247

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-16119 updated cvss 8.1

kernel: DCCP CCID structure use-after-free may lead to DoS or code execution

  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.3 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Canonical Linux kernel

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.