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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.2.6-1 | — |
| Debian 13 | linux | 5.2.6-1 | — |
| Debian 12 | linux | 5.2.6-1 | — |
| Debian 9 | linux | 4.9.258-1 | DLA-2586-1 |
| Debian 9 | linux-4.19 | 4.19.146-1~deb9u1 | DLA-2483-1, DLA-2385-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-109.110 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1077.81 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-gcp +5 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1080.90 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1066.69 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-26.28~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-edge | 5.3.0-19.20~18.04.2 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1069.70 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-oem +1 | 4.15.0-1091.101 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1048.52 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1065.69 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1083.91 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-201.233 | USN-4708-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1121.135 | USN-4709-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1079.83~16.04.1 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1091.101~16.04.1 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1080.90~16.04.1 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-112.113~16.04.1 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1087.96 | USN-4709-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1050.54~16.04.1 | USN-4414-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1145.155 | USN-4709-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1149.159 | USN-4709-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 18.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2022.22 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2006.7 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1037.42 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1055.61 | — |
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1114.123~20.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1085.89 | USN-4709-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1091.101~14.04.1 | USN-4414-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-201.233~14.04.1 | USN-4708-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.214-160.339 | 1.0-0.amzn2 | ALAS2-2021-1588 |
| Amazon Linux 2 | perf +8 | 4.14.214-160.339.amzn2 | ALAS2-2021-1588 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | perf +10 | 4.14.35-2025.403.3.el7uek | ELSA-2020-5995 |
Advisories 8
- USN-4414-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4708-1 linux, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4709-1 linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DLA-2483-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2385-1 linux-4.19 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2586-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ALAS2-2021-1588 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 26, 2021
- ELSA-2020-5995 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 14, 2020
References
- https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19816
- https://security.netapp.com/advisory/ntap-20200103-0001/
- USN-4414-1 vendor-advisory
- [debian-lts-announce] 20200928 [SECURITY] [DLA 2385-1] linux-4.19 security update mailing-list
- [debian-lts-announce] 20201210 [SECURITY] [DLA 2483-1] linux-4.19 security update mailing-list
- [debian-lts-announce] 20210309 [SECURITY] [DLA 2586-1] linux security update mailing-list