Description
An issue was discovered in the Linux kernel through 5.2.13. nbd_genl_status in drivers/block/nbd.c does not check the nla_nest_start_noflag return value.
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 | No fix yet | — |
| Debian 13 | linux | No fix yet | — |
| Debian 12 | linux | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | linux | 5.4.0-42.46 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-aws +1 | 5.4.0-1020.20 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1022.22 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-gcp +1 | 5.4.0-1021.21 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1015.15 | USN-4425-1 |
| Ubuntu 20.04 LTS | linux-raspi2 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv | 5.4.0-30.34 | USN-4425-1 |
| 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-aws-5.3 | 5.3.0-1032.34~18.04.2 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-aws-5.4 | 5.4.0-1020.20~18.04.2 | — |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1034.35~18.04.1 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1022.22~18.04.1 | USN-4425-1 |
| Ubuntu 18.04 LTS | linux-gcp +6 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1080.90 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.3 +1 | 5.3.0-1032.34~18.04.1 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.4 +1 | 5.4.0-1021.21~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1066.69 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1045.46 | USN-4439-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-64.58~18.04.1 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-42.46~18.04.1 | USN-4425-1 |
| 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-oem-osp1 | 5.0.0-1065.70 | USN-4439-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1048.52 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.3 | 5.3.0-1030.32~18.04.1 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1015.15~18.04.1 | USN-4425-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1065.69 | USN-4414-1 |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1030.32~18.04.2 | USN-4440-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1083.91 | USN-4414-1 |
| 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-oracle | 4.15.0-1050.54~16.04.1 | USN-4414-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | linux +2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1091.101~14.04.1 | USN-4414-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | perf +10 | 4.14.35-2025.402.2.1.el7uek | ELSA-2020-5913 |
Advisories 5
- USN-4440-1 linux-hwe, linux-aws-5.3, linux-azure-5.3, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-oracle-5.3, linux-raspi2-5.3 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4425-1 linux, linux-aws, linux-azure, linux-azure-5.4, linux-gcp, linux-hwe-5.4, linux-kvm, linux-oracle, linux-raspi, linux-raspi-5.4, linux-riscv vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- 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-4439-1 linux-gke-5.0, linux-oem-osp1 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- ELSA-2020-5913 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 10, 2020
References
- https://lore.kernel.org/patchwork/patch/1106884/
- https://security.netapp.com/advisory/ntap-20191004-0001/
- https://support.f5.com/csp/article/K03814795?utm_source=f5support&%3Butm_medium=RSS
- https://lore.kernel.org/patchwork/patch/1126650/
- USN-4414-1 vendor-advisory
- USN-4425-1 vendor-advisory
- USN-4439-1 vendor-advisory
- USN-4440-1 vendor-advisory