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CVE-2019-19816

26
FAUCET Score

CVE-2019-19816 describes a slab-out-of-bounds write vulnerability in the Linux kernel (specifically version 5.0.21) affecting the btrfs filesystem. An attacker can trigger this by mounting a specially crafted btrfs image and performing certain operations, impacting products from Canonical, Debian, and NetApp. With a CVSS score of 7.8 (High), this vulnerability allows for local attacks with low complexity, potentially leading to high confidentiality, integrity, and availability impacts. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.6.12, < 4.4.247CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 4.5, < 4.9.247CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 4.10, < 4.14.210CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 4.15, < 4.19.137CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
>= 4.20, < 5.2CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.8HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.29%
Probability of exploitation in next 30 days
EPSS Percentile
87.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0329 is in the 88th percentile among its peer group of 11,616 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (5)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-alt
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-rt
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-rt
redhatend of lifevia redhat_api
Product: Red Hat Enterprise MRG 2Fixed in: kernel-rt

Vendor Advisories (1)

redhatCVE-2019-19816Moderate

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

Dec 17, 2019

References

github.com / bobfuzzer/CVE/tree/master/CVE-2019-19816
ExploitThird Party Advisory
lists.debian.org / debian-lts-announce/2020/09/msg00025.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2020/12/msg00015.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2021/03/msg00010.html
Mailing ListThird Party Advisory
security.netapp.com / advisory/ntap-20200103-0001
Third Party Advisory
usn.ubuntu.com / 4414-1
Third Party Advisory