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No exploitation reportedFix available

CVE-2019-19448

No exploitation reported by the sources we read.

  • Published2019-12-08
  • Fixed in5.8.3 · 5.7.17 · 5.4.60 · 4.19.141 · 4.14.194 · 4.9.233
  • WeaknessCWE-416

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 and 5.3.11, mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in try_merge_free_space in fs/btrfs/free-space-cache.c because the pointer to a left data structure can be the same as the pointer to a right data structure.

Timeline

dates in UTC
  1. 2019-12-0802:15CVE publishedNVD

Versions per branch

NVD
Linux linux kernel
BranchAffectedFixed in
5.8≥ 5.8, < 5.8.35.8.3
5.x≥ 5.5.0, < 5.7.175.7.17
5.4≥ 4.20, < 5.4.605.4.60
4.x≥ 4.15, < 4.19.1414.19.141
4.x≥ 4.10, < 4.14.1944.14.194
4.x≥ 4.5.0, < 4.9.2334.9.233
4.4≥ 2.6.31, < 4.4.2334.4.233
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

15 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.els13and 9 other packages
  • kernelTuxCare:CentOS:6all versions · fixed in 2.6.32-754.35.8.el6.tuxcare.els13and 9 other packages
  • kernelMageia:7all versions · fixed in 5.7.19-1.mga7and 1 other package
  • kmod-virtualboxMageia:7all versions · fixed in 6.0.24-5.mga7
  • kmod-xtables-addonsMageia:7all versions · fixed in 3.10-3.mga7
  • linuxUbuntu:Pro:14.04:LTSall versions · no fixed version listed
  • linuxUbuntu:20.04:LTSall versions · fixed in 5.4.0-48.52
  • linuxUbuntu:18.04:LTSall versions · fixed in 4.15.0-121.123

52 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-19448 Red Hat Product Security27 known affected

    kernel: mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in try_merge_free_space in fs/btrfs/free-space-cache.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 · +24 more

Full record on NVD

Fix

  1. Update Linux linux kernel to 5.8.3 · 5.7.17 · 5.4.60 · 4.19.141 · 4.14.194 · 4.9.233 · 4.4.233
  2. Workaround from the vendor Red Hat Product Security CVE-2019-19448 · 27 productsIf the system requires this filesystem to work correctly, this mitigation may not be suitable. As the BTRFS module will be auto-loaded when required, autoloading can be prevented by disabling the module, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Se…
  3. No fix planned, says the vendor Red Hat Product Security CVE-2019-19448 · 14 productsOut of support scope
  4. No fix planned, says the vendor Red Hat Product Security CVE-2019-19448 · 13 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

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
2019-12-08
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-55vw-8vf8-x898

Frequently asked questions

What is CVE-2019-19448?

In the Linux kernel 5.0.21 and 5.3.11, mounting a crafted btrfs filesystem image, performing some operations, and then making a syncfs system call can lead to a use-after-free in try_merge_free_space in fs/btrfs/free-space-cache.c because the pointer to a left data structure can be the same as the pointer to a right data structure.

Is CVE-2019-19448 actively exploited?

Active exploitation of CVE-2019-19448 has not been confirmed. Its EPSS score was 2.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-19448?

CVE-2019-19448 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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