CVE-2019-19448
HIGHCVSS 7.8/10EPSS 2.23%
Last modified
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/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
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
- Last Modified
- Status
- Modified
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.
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-19448?
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Scan your code nowSource: NVD / NIST