Description
A flaw was found in the MCTP protocol in the Linux kernel. The function mctp_unregister() reclaims the device's relevant resource when a netcard detaches. However, a running routine may be unaware of this and cause the use-after-free of the mdev->addrs object, potentially leading to a denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Linux Kernel (mctp) | Fixed in kernel 5.18-rc5 | — |
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 | 5.17.6-1 | — |
| Debian 13 | linux | 5.17.6-1 | — |
| Debian 12 | linux | 5.17.6-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1021.23 | — |
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-78.85 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1040.45 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1042.49 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1042.49.1 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1038.46 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1038.43 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1024.29 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1034.37 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1036.41 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1029.29 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1016.16 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1002.2 | — |
| Ubuntu 22.04 LTS | linux-oem-5.17 | 5.17.0-1011.12 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1039.45 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-riscv +3 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1025.29 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1040.45~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1042.49~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1042.49~20.04.1.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1038.46~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-gke-5.15 | 5.15.0-1038.43~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1024.29~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-78.85~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1036.41~20.04.1 | USN-6255-1 |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1016.16~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1039.45~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-riscv +23 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1037.41~20.04.2 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1035.37 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1042.47 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips | No fix yet | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel +1 | 5.15.126.1-1 | — |
Advisories 3
- USN-6255-1 linux-intel-iotg-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-6246-1 linux, linux-aws, linux-aws-5.15, linux-azure, linux-azure-5.15, linux-azure-fde, linux-azure-fde-5.15, linux-gcp, linux-gcp-5.15, linux-gke, linux-gke-5.15, linux-gkeop, linux-gkeop-5.15, linux-hwe-5.15, linux-ibm, linux-intel-iotg, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-oracle, linux-oracle-5.15, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- WID-SEC-2023-1595 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 18, 2024