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No exploitation reportedFix available

CVE-2019-19816

No exploitation reported by the sources we read.

  • Published2019-12-17
  • Fixed in5.2 · 4.19.137 · 4.14.210 · 4.9.247 · 4.4.247
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image and performing some operations can cause slab-out-of-bounds write access in __btrfs_map_block in fs/btrfs/volumes.c, because a value of 1 for the number of data stripes is mishandled.

Timeline

dates in UTC
  1. 2019-12-1706:15CVE publishedNVD

Versions per branch

NVD
Linux linux kernel
BranchAffectedFixed in
5.2≥ 4.20, < 5.25.2
4.x≥ 4.15, < 4.19.1374.19.137
4.x≥ 4.10, < 4.14.2104.14.210
4.x≥ 4.5, < 4.9.2474.9.247
4.4≥ 2.6.12, < 4.4.2474.4.247
Canonical ubuntu linux
BranchAffectedFixed in
14.4= 14.04no fix published
16.4= 16.04no fix published
18.4= 18.04no fix published
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published

10 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • kernelTuxCare:OracleLinux:6all versions · fixed in 2.6.32-754.35.8.el6.tuxcare.els35and 9 other packages
  • kernelTuxCare:OracleLinux:6all versions · fixed in 2.6.32-754.35.8.el6.tuxcare.els39and 9 other packages
  • kernelTuxCare:CentOS:6all versions · fixed in 2.6.32-754.35.8.el6.tuxcare.els35and 9 other packages
  • linuxUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • linuxUbuntu:18.04:LTSall versions · fixed in 4.15.0-109.110
  • linuxUbuntu:16.04:LTSall versions · fixed in 4.4.0-201.233
  • linuxDebian:14all versions · fixed in 5.2.6-1
  • linuxDebian:13all versions · fixed in 5.2.6-1

45 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-19816 Red Hat Product Security71 known affected

    kernel: out-of-bounds write in __btrfs_map_block in fs/btrfs/volumes.c

    kernel as a component of Red Hat Enterprise Linux 6 · kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6 · kernel-bootwrapper as a component of Red Hat Enterprise Linux 6 · +68 more

Full record on NVD

Fix

  1. Update Linux linux kernel to 5.2 · 4.19.137 · 4.14.210 · 4.9.247 · 4.4.247
  2. Workaround from the vendor Red Hat Product Security CVE-2019-19816 · 71 productsAs the BTRFS module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions: # echo "install btrfs /bin/true" >> /etc/modprobe.d/disable-btrfs.conf The system will need to be restarted if the BTRFS modules are loaded, it may…
  3. No fix planned, says the vendor Red Hat Product Security CVE-2019-19816 · 14 productsOut of support scope
  4. No fix planned, says the vendor Red Hat Product Security CVE-2019-19816 · 57 productsWill not fix

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

  • EUVD-2019-9414same flawENISA EUVD · LicenseRef-ENISA-legal-notice
  • GHSA-m6v9-2r23-587csame flawGitHub Advisory Database · CC-BY-4.0
  • DLA-2385-1advisory covering several CVEsDebian · LicenseRef-unstated
  • DLA-2483-1advisory covering several CVEsDebian · LicenseRef-unstated
  • DLA-2586-1advisory covering several CVEsDebian · LicenseRef-unstated
  • USN-4414-1advisory covering several CVEsUbuntu
  • USN-4708-1advisory covering several CVEsUbuntu
  • USN-4709-1advisory covering several CVEsUbuntu

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2019-12-17
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-m6v9-2r23-587c

Frequently asked questions

What is CVE-2019-19816?

In the Linux kernel 5.0.21, mounting a crafted btrfs filesystem image and performing some operations can cause slab-out-of-bounds write access in __btrfs_map_block in fs/btrfs/volumes.c, because a value of 1 for the number of data stripes is mishandled.

Is CVE-2019-19816 actively exploited?

Active exploitation of CVE-2019-19816 has not been confirmed. Its EPSS score was 3.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-19816?

CVE-2019-19816 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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Sources for this record