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Fencer Vulns
medium 5.5

CVE-2019-20811 json

An issue was discovered in the Linux kernel before 5.0.6.

published 2020-06-03 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-11348

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

An issue was discovered in the Linux kernel before 5.0.6. In rx_queue_add_kobject() and netdev_queue_add_kobject() in net/core/net-sysfs.c, a reference count is mishandled, aka CID-a3e23f719f5c.

Patch / fix

  • linux linux_kernel 5.0.6
  • linux Debian 14, Debian 13, Debian 12 4.19.37-1

debian advisories DEBIAN-CVE-2019-20811

  • linux Ubuntu 16.04 LTS 4.4.0-190.220
  • linux Ubuntu 18.04 LTS 4.15.0-60.67
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1114.127
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1047.49
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1041.43
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-60.67~16.04.1
  • linux-hwe Ubuntu 18.04 LTS 5.0.0-23.24~18.04.1
  • linux-kvm Ubuntu 16.04 LTS 4.4.0-1080.87

ubuntu advisories UBUNTU-CVE-2019-20811

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 RHEL 8 4.18.0-147.el8
  • perf RHEL 8 4.18.0-147.el8
  • bpftool RHEL 8 4.18.0-147.el8
  • kernel-core RHEL 8 4.18.0-147.el8
  • kernel-tools RHEL 8 4.18.0-147.el8
  • python3-perf RHEL 8 4.18.0-147.el8
  • kernel-modules RHEL 8 4.18.0-147.el8
  • kernel-zfcpdump RHEL 8 4.18.0-147.el8

red hat advisories RHSA-2019:3517RHSA-2020:5023RHSA-2020:5026

  • kernel-syms SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.14-150100.197.114.2
  • kernel-source SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.14-150100.197.114.2
  • kernel-default SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +7 more 4.12.14-150100.197.114.2
  • kernel-vanilla openSUSE Leap 15.4, openSUSE Leap 15.3 4.12.14-150100.197.114.2
  • kernel-kvmsmall openSUSE Leap 15.4, openSUSE Leap 15.3 4.12.14-150100.197.114.2
  • kernel-zfcpdump SLES 15 SP1-LTSS, openSUSE Leap 15.4, openSUSE Leap 15.3 4.12.14-150100.197.114.2
  • kernel-obs-build SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.14-150100.197.114.2
  • kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150000.150.92.2

suse advisories SUSE-SU-2022:2111-1SUSE-SU-2022:2103-1SUSE-SU-2022:2083-1SUSE-SU-2022:1686-1SUSE-SU-2022:1668-1SUSE-SU-2022:1651-1

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-2019-20811 updated cvss 3.3

kernel: net-sysfs: *_queue_add_kobject refcount issue

  • 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 8 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +6 more
    affected: workaround, no fix available
  • 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 4.18.0-147.el8, kernel-debuginfo-common-aarch64 4.18.0-147.el8, kernel-debuginfo-common-ppc64le 4.18.0-147.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-147.el8, kernel 4.18.0-147.el8, bpftool 4.18.0-147.el8, kernel-core 4.18.0-147.el8, kernel-tools 4.18.0-147.el8, python3-perf 4.18.0-147.el8, +15 more
    fixed: vendor fix RHSA-2019:3517
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1160.6.1.el7, kernel 3.10.0-1160.6.1.el7, bpftool 3.10.0-1160.6.1.el7, python-perf 3.10.0-1160.6.1.el7, kernel-tools 3.10.0-1160.6.1.el7, kernel-tools-libs 3.10.0-1160.6.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.6.1.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.6.1.el7
    fixed: vendor fix RHSA-2020:5023
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-1160.6.1.rt56.1139.el7, kernel-rt-trace 3.10.0-1160.6.1.rt56.1139.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.6.1.rt56.1139.el7 Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1160.6.1.rt56.1139.el7, kernel-rt-kvm 3.10.0-1160.6.1.rt56.1139.el7, kernel-rt-trace 3.10.0-1160.6.1.rt56.1139.el7, kernel-rt-debug-kvm 3.10.0-1160.6.1.rt56.1139.el7, kernel-rt-trace-kvm 3.10.0-1160.6.1.rt56.1139.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.6.1.rt56.1139.el7
    fixed: vendor fix RHSA-2020:5026
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1160.6.1.el7, kernel 3.10.0-1160.6.1.el7, bpftool 3.10.0-1160.6.1.el7, python-perf 3.10.0-1160.6.1.el7, kernel-kdump 3.10.0-1160.6.1.el7, kernel-tools 3.10.0-1160.6.1.el7, +7 more Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1160.6.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1160.6.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1160.6.1.el7 Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1160.6.1.el7, kernel 3.10.0-1160.6.1.el7, bpftool 3.10.0-1160.6.1.el7, python-perf 3.10.0-1160.6.1.el7, kernel-tools 3.10.0-1160.6.1.el7, kernel-tools-libs 3.10.0-1160.6.1.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1160.6.1.el7
    fixed: vendor fix RHSA-2020:5023
  • Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more Red Hat Enterprise Linux Client (v. 7) kernel-headers 3.10.0-1160.6.1.el7 Red Hat Enterprise Linux Server (v. 7) kernel-headers 3.10.0-1160.6.1.el7 Red Hat Enterprise Linux Workstation (v. 7) kernel-headers 3.10.0-1160.6.1.el7
    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

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:P/A:N

Classification

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.