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Fencer Vulns
medium 5.5

CVE-2019-19036 json

btrfs_root_node in fs/btrfs/ctree.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because rcu_dereference(root->node…

published 2019-11-21 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-8678

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

btrfs_root_node in fs/btrfs/ctree.c in the Linux kernel through 5.3.12 allows a NULL pointer dereference because rcu_dereference(root->node) can be zero.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 5.3.7-1

debian advisories DEBIAN-CVE-2019-19036

  • linux Ubuntu 18.04 LTS 4.15.0-109.110
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1077.81
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1080.90~16.04.1
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-112.113~16.04.1
  • linux-hwe Ubuntu 18.04 LTS 5.3.0-26.28~18.04.1
  • linux-kvm Ubuntu 18.04 LTS 4.15.0-1069.70
  • linux-oem Ubuntu 18.04 LTS 4.15.0-1091.101
  • linux-azure Ubuntu 16.04 LTS 4.15.0-1091.101~16.04.1

ubuntu advisories UBUNTU-CVE-2019-19036

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-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
  • kernel-source SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
  • kernel-default SLES for SAP 15, SLES 15-LTSS, SLE Live Patching 15 +3 more 4.12.14-150.52.1
  • kernel-vanilla SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
  • kernel-obs-build SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.52.1
  • kernel-rt Real Time Module 15 SP1 4.12.14-14.17.1
  • kernel-syms-rt Real Time Module 15 SP1 4.12.14-14.17.1
  • kernel-rt_debug Real Time Module 15 SP1 4.12.14-14.17.1

suse advisories SUSE-SU-2020:1663-1SUSE-SU-2020:0613-1SUSE-SU-2020:0605-1SUSE-SU-2020:0599-1SUSE-SU-2020:0584-1SUSE-SU-2020:0580-1

  • kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.40.1
  • kernel-obs-build openSUSE Leap 15.1 4.12.14-lp151.28.40.1

opensuse advisories openSUSE-SU-2020:0336-1

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-2019-19036 updated cvss 5.5

kernel: null-pointer dereference in btrfs_root_node in fs/btrfs/ctree.c

  • 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 kernel, bpftool, kernel-rt, kernel-rt-kvm, kernel-rt-trace, kernel-rt-debug-kvm, +1 more Red Hat Enterprise MRG 2 kernel
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 7 perf, kernel, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 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

1.84% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19036 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

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.