CVE-2019-19448

Name: CVE-2019-19448
Creator: NVD / NIST
Published: 2019-12-08T02:15:09.907+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 2.23%

Last modified Jun 17, 2026

CVE-2019-19448 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 2.23% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

2.23%

80.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 2.6.31, < 4.4.233
Linux	Linux Kernel	>= 4.5.0, < 4.9.233
Linux	Linux Kernel	>= 4.10, < 4.14.194
Linux	Linux Kernel	>= 4.15, < 4.19.141
Linux	Linux Kernel	>= 4.20, < 5.4.60
Linux	Linux Kernel	>= 5.5.0, < 5.7.17
Linux	Linux Kernel	>= 5.8, < 5.8.3
Debian	Debian Linux	9.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Netapp	Active Iq Unified Manager	All versions
Netapp	Cloud Backup	All versions
Netapp	Data Availability Services	All versions
Netapp	Hci Management Node	All versions
Netapp	Solidfire	All versions
Netapp	Steelstore Cloud Integrated Storage	All versions
Netapp	A700s Firmware	All versions
Netapp	Fas 8300 Firmware	All versions
Netapp	Fas 8700 Firmware	All versions
Netapp	Fas A400 Firmware	All versions
Netapp	Aff 8300 Firmware	All versions
Netapp	Aff 8700 Firmware	All versions
Netapp	Aff A400 Firmware	All versions
Netapp	H610s Firmware	All versions
Netapp	Solidfire Baseboard Management Controller Firmware	All versions

References

https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19448Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00025.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200103-0001/Third Party Advisory
https://usn.ubuntu.com/4578-1/Third Party Advisory
https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19448Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00025.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00032.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00034.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20200103-0001/Third Party Advisory
https://usn.ubuntu.com/4578-1/Third Party Advisory

Timeline

Published: Dec 8, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-19448?

How severe is CVE-2019-19448?

CVE-2019-19448 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 2.23% probability of exploitation in the next 30 days.

How do I fix CVE-2019-19448?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-19448?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST