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Fencer Intel
medium 5.3

CVE-2019-18282 json

The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f.

published 6y ago modified 4mo ago also EUVD-2019-8071

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.9%
EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

The flow_dissector feature in the Linux kernel 4.3 through 5.x before 5.3.10 has a device tracking vulnerability, aka CID-55667441c84f. This occurs because the auto flowlabel of a UDP IPv6 packet relies on a 32-bit hashrnd value as a secret, and because jhash (instead of siphash) is used. The hashrnd value remains the same starting from boot time, and can be inferred by an attacker. This affects net/core/flow_dissector.c and related code.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 5.3.15-1

debian advisories DEBIAN-CVE-2019-18282

  • linux Ubuntu 16.04 LTS 4.4.0-170.199
  • linux Ubuntu 18.04 LTS 4.15.0-74.84
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1099.110
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1057.59
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1052.56
  • linux-gcp Ubuntu 18.04 LTS 5.0.0-1028.29~18.04.1
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-74.83~16.04.1
  • linux-hwe Ubuntu 18.04 LTS 5.3.0-26.28~18.04.1

ubuntu advisories UBUNTU-CVE-2019-18282

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 RHEL 8 4.18.0-193.rt13.51.el8
  • kernel-rt-kvm RHEL 8 4.18.0-193.rt13.51.el8
  • kernel-rt-core RHEL 8 4.18.0-193.rt13.51.el8
  • kernel-rt-modules RHEL 8 4.18.0-193.rt13.51.el8
  • kernel-rt-debug-kvm RHEL 8 4.18.0-193.rt13.51.el8
  • kernel-rt-debug-core RHEL 8 4.18.0-193.rt13.51.el8
  • kernel-rt-debug-modules RHEL 8 4.18.0-193.rt13.51.el8
  • kernel-rt-modules-extra RHEL 8 4.18.0-193.rt13.51.el8

red hat advisories RHSA-2020:1567RHSA-2020:1769RHSA-2020:5441RHSA-2020:5437

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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-2019-18282 updated cvss 5.3

kernel: The flow_dissector feature allows device tracking

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-193.el8, kernel-debuginfo-common-aarch64 4.18.0-193.el8, kernel-debuginfo-common-ppc64le 4.18.0-193.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-193.el8, kernel 4.18.0-193.el8, bpftool 4.18.0-193.el8, kernel-core 4.18.0-193.el8, kernel-tools 4.18.0-193.el8, python3-perf 4.18.0-193.el8, +15 more
    fixed: vendor fix RHSA-2020:1769
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1160.11.1.el7, kernel 3.10.0-1160.11.1.el7, bpftool 3.10.0-1160.11.1.el7, python-perf 3.10.0-1160.11.1.el7, kernel-tools 3.10.0-1160.11.1.el7, kernel-tools-libs 3.10.0-1160.11.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7
    fixed: vendor fix RHSA-2020:5437
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-trace 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.11.1.rt56.1145.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-kvm 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-trace 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-debug-kvm 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-trace-kvm 3.10.0-1160.11.1.rt56.1145.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.11.1.rt56.1145.el7
    fixed: vendor fix RHSA-2020:5441
  • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-193.rt13.51.el8, kernel-rt-core 4.18.0-193.rt13.51.el8, kernel-rt-modules 4.18.0-193.rt13.51.el8, kernel-rt-debug-core 4.18.0-193.rt13.51.el8, kernel-rt-debug-modules 4.18.0-193.rt13.51.el8, kernel-rt-modules-extra 4.18.0-193.rt13.51.el8, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-193.rt13.51.el8, kernel-rt-kvm 4.18.0-193.rt13.51.el8, kernel-rt-core 4.18.0-193.rt13.51.el8, kernel-rt-modules 4.18.0-193.rt13.51.el8, kernel-rt-debug-kvm 4.18.0-193.rt13.51.el8, kernel-rt-debug-core 4.18.0-193.rt13.51.el8, +4 more
    fixed: vendor fix RHSA-2020:1567
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1160.11.1.el7, kernel 3.10.0-1160.11.1.el7, bpftool 3.10.0-1160.11.1.el7, python-perf 3.10.0-1160.11.1.el7, kernel-kdump 3.10.0-1160.11.1.el7, kernel-tools 3.10.0-1160.11.1.el7, +7 more Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1160.11.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.11.1.el7 Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1160.11.1.el7, kernel 3.10.0-1160.11.1.el7, bpftool 3.10.0-1160.11.1.el7, python-perf 3.10.0-1160.11.1.el7, kernel-tools 3.10.0-1160.11.1.el7, kernel-tools-libs 3.10.0-1160.11.1.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.11.1.el7
    fixed: vendor fix RHSA-2020:5437

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

2.92% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-330 Use of Insufficiently Random Values
Technology feeds

References

Sources

Fencer Intel 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.