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Fencer Intel
high 7.8

CVE-2019-19377 json

In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image, performing some operations, and unmounting can lead to a use-after-f…

published 6y ago modified 4mo ago also EUVD-2019-8998

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image, performing some operations, and unmounting can lead to a use-after-free in btrfs_queue_work in fs/btrfs/async-thread.c.

Patch / fix

  • linux linux_kernel 4.19.156, 5.4.33, 5.5.18, 5.6.5
  • linux Debian 14, Debian 13, Debian 12 5.6.7-1

debian advisories DEBIAN-CVE-2019-19377

  • linux Ubuntu 18.04 LTS 4.15.0-109.110
  • linux Ubuntu 20.04 LTS 5.4.0-31.35
  • linux-aws Ubuntu 18.04 LTS 4.15.0-1077.81
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1011.11
  • linux-gcp Ubuntu 16.04 LTS 4.15.0-1080.90~16.04.1
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1011.11
  • linux-hwe Ubuntu 16.04 LTS 4.15.0-112.113~16.04.1
  • linux-hwe Ubuntu 18.04 LTS 5.3.0-53.47~18.04.1

ubuntu advisories UBUNTU-CVE-2019-19377

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 SLE Real Time 12 SP5 4.12.14-10.94.1
  • kernel-syms-rt SLE Real Time 12 SP5 4.12.14-10.94.1
  • kernel-rt_debug SLE Real Time 12 SP5 4.12.14-10.94.1
  • kernel-source-rt SLE Real Time 12 SP5 4.12.14-10.94.1
  • kernel-syms SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.102.1
  • kernel-source SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.12.14-95.102.1
  • kernel-default SLES for SAP 12 SP4, SLES 12 SP4-LTSS, SLE Live Patching 12 SP4 +3 more 4.12.14-95.102.1
  • kernel-rt SLE Micro 5.2, SLE Micro 5.1, Real Time Module 15 SP3 5.3.18-150300.93.1

suse advisories SUSE-SU-2022:2629-1SUSE-SU-2022:2393-1SUSE-SU-2022:2177-1SUSE-SU-2022:2116-1SUSE-SU-2022:2111-1SUSE-SU-2022:2104-1

  • kernel-rt openSUSE Leap Micro 5.2 5.3.18-150300.93.1

opensuse advisories openSUSE-SU-2022:2177-1

Is CVE-2019-19377 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2019-19377 updated cvss 7.8

kernel: use-after-free in btrfs_queue_work in fs/btrfs/async-thread.c

  • 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, bpftool, kernel-rt, kernel-alt, python-perf, +9 more
    affected: workaround, no fix planned “Will not fix”
  • 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 “Will not fix”
  • Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-core, kernel-tools, python3-perf, +17 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

3.40% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19377 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
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.