Vulnerability · Published Nov 12, 2025 · Assigned by Linux
CVE-2025-40204sctp: Fix MAC comparison to be constant-time
High 8.1
In plain English
A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.5%top 59.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In the Linux kernel, the following vulnerability has been resolved: sctp: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 6.1.158-1 | DEBIAN-CVE-2025-40204 |
| Debian:13 | linux | 6.12.57-1 | DEBIAN-CVE-2025-40204 |
| Debian:14 | linux | 6.17.6-1 | DEBIAN-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux | 5.15.0-170.180 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux | 6.8.0-106.106 | UBUNTU-CVE-2025-40204 |
| Ubuntu:25.10 | linux | 6.17.0-14.14 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-allwinner-5.19 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-aws | 5.15.0-1100.107 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-aws | 6.8.0-1050.53 | UBUNTU-CVE-2025-40204 |
| Ubuntu:25.10 | linux-aws | 6.17.0-1007.7 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-aws-5.19 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-aws-6.14 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-aws-6.17 | 6.17.0-1007.7~24.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-aws-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-aws-6.8 | 6.8.0-1050.53~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-azure | 5.15.0-1109.118 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-azure | 6.8.0-1051.57 | UBUNTU-CVE-2025-40204 |
| Ubuntu:25.10 | linux-azure | 6.17.0-1008.8 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-azure-5.19 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-azure-6.11 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-azure-6.14 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-azure-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-azure-6.8 | 6.8.0-1051.57~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-azure-fde | 5.15.0-1109.118.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-azure-fde | 6.8.0-1058.65 | UBUNTU-CVE-2025-40204 |
| Ubuntu:25.10 | linux-azure-fde | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-azure-fde-5.19 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-azure-fde-6.14 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.8 | 6.8.0-1058.65~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-azure-nvidia | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-azure-nvidia-6.14 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-gcp | 5.15.0-1100.109 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-gcp | 6.8.0-1052.55 | UBUNTU-CVE-2025-40204 |
| Ubuntu:25.10 | linux-gcp | 6.17.0-1007.7 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-gcp-5.19 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-gcp-6.11 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-gcp-6.14 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-gcp-6.17 | 6.17.0-1008.8~24.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-gcp-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-gcp-6.8 | 6.8.0-1052.55~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-gke | 5.15.0-1096.102 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-gke | 6.8.0-1048.53 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-gkeop | 5.15.0-1083.91 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-gkeop | 6.8.0-1035.38 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-hwe-5.19 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-hwe-6.11 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-hwe-6.14 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-hwe-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-hwe-6.8 | 6.8.0-106.106~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-ibm | 5.15.0-1094.97 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-ibm | 6.8.0-1049.49 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-ibm-6.8 | 6.8.0-1049.49~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-intel-iotg | 5.15.0-1095.101 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-kvm | 5.15.0-1092.97 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-lowlatency | 5.15.0-170.180 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-lowlatency | 6.8.0-106.106.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-5.19 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-lowlatency-hwe-6.11 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.8 | 6.8.0-106.106.1~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-nvidia | 5.15.0-1095.96 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-nvidia | 6.8.0-1049.52 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-nvidia-6.11 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-nvidia-6.17 | 6.17.0-1008.8 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-nvidia-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-nvidia-6.8 | 6.8.0-1049.52~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-nvidia-lowlatency | 6.8.0-1049.52.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra | 5.15.0-1052.52 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-nvidia-tegra | 6.8.0-1020.20 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra-igx | 5.15.0-1041.41 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-oem-6.11 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-oem-6.14 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-oem-6.17 | 6.17.0-1011.11 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-oem-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-oem-6.8 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-oracle | 5.15.0-1097.103 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-oracle | 6.8.0-1047.48 | UBUNTU-CVE-2025-40204 |
| Ubuntu:25.10 | linux-oracle | 6.17.0-1007.7 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-oracle-6.14 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-oracle-6.17 | 6.17.0-1007.7~24.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-oracle-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-oracle-6.8 | 6.8.0-1047.48~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-raspi | 5.15.0-1097.100 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-raspi | 6.8.0-1050.54 | UBUNTU-CVE-2025-40204 |
| Ubuntu:25.10 | linux-raspi | 6.17.0-1008.8 | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:25.10 | linux-realtime | 6.17.0-1006.7 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:25.10 | linux-riscv | 6.17.0-14.14.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-riscv-5.19 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-riscv-6.14 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-riscv-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-riscv-6.8 | 6.8.0-106.106~22.04.1 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-starfive-5.19 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-starfive-6.5 | no fix listed | UBUNTU-CVE-2025-40204 |
| Ubuntu:24.04:LTS | linux-xilinx | 6.8.0-1028.29 | UBUNTU-CVE-2025-40204 |
| Ubuntu:22.04:LTS | linux-xilinx-zynqmp | 5.15.0-1064.68 | UBUNTU-CVE-2025-40204 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before b93fa8dc521d00d2d44bf034fb90e0d79b0366171da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 0e8b8c326c2a6de4d837b1bb034ea704f4690d771da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 9c05d44ec24126fc283835b68f82dba3ae9852091da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before ed3044b9c810c5c24eb2830053fbfe5fd134c5d41da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 8019b3699289fce3f10b63f98601db97b8d105b01da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before 0b32ff285ff6f6f1ac1d9495787ccce8837d64051da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – before dd91c79e4f58fbe2898dac84858033700e0e99fb |
| Linux | Linux | 2.6.12 |
References
- https://git.kernel.org/stable/c/b93fa8dc521d00d2d44bf034fb90e0d79b036617
- https://git.kernel.org/stable/c/0e8b8c326c2a6de4d837b1bb034ea704f4690d77
- https://git.kernel.org/stable/c/1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c
- https://git.kernel.org/stable/c/9c05d44ec24126fc283835b68f82dba3ae985209
- https://git.kernel.org/stable/c/ed3044b9c810c5c24eb2830053fbfe5fd134c5d4
- https://git.kernel.org/stable/c/8019b3699289fce3f10b63f98601db97b8d105b0
- https://git.kernel.org/stable/c/0b32ff285ff6f6f1ac1d9495787ccce8837d6405
- https://git.kernel.org/stable/c/dd91c79e4f58fbe2898dac84858033700e0e99fb