Description
fs/btrfs/volumes.c in the Linux kernel before 5.1 allows a btrfs_verify_dev_extents NULL pointer dereference via a crafted btrfs image because fs_devices->devices is mishandled within find_device, aka CID-09ba3bc9dd15.
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-4.19 | 4.19.132-1~deb9u2 | DLA-2323-1 |
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 | 4.15.0-88.88 | USN-4287-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1060.62 | USN-4287-1 |
| Ubuntu 18.04 LTS | linux-aws-5.0 | 5.0.0-1024.27~18.04.1 | USN-4258-1 |
| Ubuntu 18.04 LTS | linux-azure | 5.0.0-1029.31~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +1 | 5.0.0-1029.30~18.04.1 | USN-4258-1 |
| Ubuntu 18.04 LTS | linux-gcp-edge +2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1052.55 | USN-4287-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-26.28~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1053.53 | USN-4287-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1073.83 | — |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1037.42 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1033.36 | USN-4287-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.0 | 5.0.0-1010.15~18.04.1 | USN-4258-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1055.59 | USN-4287-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1072.79 | USN-4287-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-173.203 | USN-4254-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1101.112 | USN-4254-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1060.62~16.04.1 | USN-4287-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1071.76 | USN-4287-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1055.59 | USN-4287-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-88.88~16.04.1 | USN-4287-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1065.72 | USN-4254-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1033.36~16.04.1 | USN-4287-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1128.137 | USN-4254-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1132.140 | USN-4254-1 |
Show 5 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 | 4.15.0-2018.18 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2006.7 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1028.33 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1061.65 | USN-4254-2 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1071.76~14.04.1 | USN-4287-2 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-173.203~14.04.1 | USN-4254-2 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.43.4.el7uek | ELSA-2020-5885, ELSA-2020-5866, ELSA-2020-5845 |
| Oracle Linux 7 | perf +5 | 4.14.35-1902.306.2.el7uek | ELSA-2020-5885, ELSA-2020-5845, ELSA-2020-5844 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
bobfuzzer/CVE-2019-18885 ★ 2 · Nov 12, 2019
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 11
- USN-4258-1 linux-aws-5.0, linux-gcp, linux-gke-5.0, linux-oracle-5.0 vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- USN-4287-1 linux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Sep 7, 2026
- USN-4287-2 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4254-1 linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4254-2 linux-lts-xenial, linux-aws vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- DLA-2323-1 linux-4.19 - new package Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2025-2771 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 9, 2025
- ELSA-2020-5885 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 12, 2020
- ELSA-2020-5866 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
- ELSA-2020-5844 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 11, 2020
- ELSA-2020-5845 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 11, 2020
References
- USN-4254-1 vendor-advisory
- USN-4254-2 vendor-advisory
- USN-4258-1 vendor-advisory
- USN-4287-1 vendor-advisory
- USN-4287-2 vendor-advisory
- [debian-lts-announce] 20200812 [SECURITY] [DLA 2323-1] linux-4.19 new package mailing-list
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://github.com/torvalds/linux/commit/09ba3bc9dd150457c506e4661380a6183af651c1
- https://github.com/bobfuzzer/CVE-2019-18885
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=09ba3bc9dd150457c506e4661380a6183af651c1
- https://security.netapp.com/advisory/ntap-20191205-0001/
- http://packetstormsecurity.com/files/156185/Kernel-Live-Patch-Security-Notice-LSN-0062-1.html