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Vulnerability record · CVE-2019-19816 · published 17 December 2019

CVE-2019-19816: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 3.3% · top 11.9% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score, v2 9.3
3.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
13Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

13 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2019-19816), CISA KEV, FIRST EPSS (scores of 2026-10-04). This page is refreshed as NVD updates the record.