Vulnerability · Published Feb 27, 2025 · Assigned by Linux
CVE-2025-21766ipv4: use RCU protection in __ip_rt_update_pmtu()
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 0.6% (higher than 47% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.6%top 52.6% 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: ipv4: use RCU protection in __ip_rt_update_pmtu() __ip_rt_update_pmtu() must use RCU protection to make sure the net structure it reads does not disappear.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | linux | 6.1.129-1 | DEBIAN-CVE-2025-21766 |
| Debian:13 | linux | 6.12.16-1 | DEBIAN-CVE-2025-21766 |
| Debian:14 | linux | 6.12.16-1 | DEBIAN-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux | 5.15.0-140.150 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux | 6.8.0-78.78 | USN-7703-1 |
| Ubuntu:24.04:LTS | linux | 6.8.0-78.78 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-allwinner-5.19 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-aws | 5.15.0-1084.91 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-aws | 6.8.0-1035.37 | USN-7703-1 |
| Ubuntu:24.04:LTS | linux-aws | 6.8.0-1035.37 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-aws-5.19 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-aws-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-aws-6.8 | 6.8.0-1035.37~22.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-aws-6.8 | 6.8.0-1035.37~22.04.1 | USN-7703-2 |
| Ubuntu:22.04:LTS | linux-azure | 5.15.0-1089.98 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-azure | 6.8.0-1034.39 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-azure-5.19 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-azure-6.11 | 6.11.0-1015.15~24.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-azure-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-azure-6.8 | 6.8.0-1034.39~22.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-azure-fde | 5.15.0-1089.98.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-azure-fde-5.19 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-azure-nvidia | 6.8.0-1022.23 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-gcp | 5.15.0-1083.92 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-gcp | 6.8.0-1036.38 | USN-7703-2 |
| Ubuntu:24.04:LTS | linux-gcp | 6.8.0-1036.38 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-gcp-5.19 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-gcp-6.11 | 6.11.0-1015.15~24.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-gcp-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-gcp-6.8 | 6.8.0-1036.38~22.04.1 | USN-7703-2 |
| Ubuntu:22.04:LTS | linux-gcp-6.8 | 6.8.0-1036.38~22.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-gke | 5.15.0-1081.87 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-gke | 6.8.0-1032.36 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-gke | 6.8.0-1032.36 | USN-7703-4 |
| Ubuntu:22.04:LTS | linux-gkeop | 5.15.0-1066.74 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-gkeop | 6.8.0-1019.21 | USN-7703-2 |
| Ubuntu:24.04:LTS | linux-gkeop | 6.8.0-1019.21 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-hwe-5.19 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-hwe-6.11 | 6.11.0-26.26~24.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-hwe-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-hwe-6.8 | 6.8.0-78.78~22.04.1 | USN-7703-4 |
| Ubuntu:22.04:LTS | linux-hwe-6.8 | 6.8.0-78.78~22.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-ibm | 5.15.0-1076.79 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-ibm | 6.8.0-1033.33 | USN-7703-2 |
| Ubuntu:24.04:LTS | linux-ibm | 6.8.0-1033.33 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-ibm-6.8 | 6.8.0-1033.33~22.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-ibm-6.8 | 6.8.0-1033.33~22.04.1 | USN-7703-2 |
| Ubuntu:24.04:LTS | linux-intel | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-intel-iotg | 5.15.0-1079.85 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-kvm | 5.15.0-1080.85 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-lowlatency | 5.15.0-140.150 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-lowlatency | 6.8.0-78.78.1 | USN-7703-1 |
| Ubuntu:24.04:LTS | linux-lowlatency | 6.8.0-78.78.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-5.19 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-lowlatency-hwe-6.11 | 6.11.0-1014.15~24.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.8 | 6.8.0-78.78.1~22.04.1 | USN-7703-1 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.8 | 6.8.0-78.78.1~22.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-nvidia | 5.15.0-1078.79 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-nvidia | 6.8.0-1035.38 | USN-7703-4 |
| Ubuntu:24.04:LTS | linux-nvidia | 6.8.0-1035.38 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-nvidia-6.11 | 6.11.0-1010.10 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-nvidia-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-nvidia-6.8 | 6.8.0-1035.38~22.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-nvidia-6.8 | 6.8.0-1035.38~22.04.1 | USN-7703-4 |
| Ubuntu:24.04:LTS | linux-nvidia-lowlatency | 6.8.0-1035.38.1 | USN-7703-4 |
| Ubuntu:24.04:LTS | linux-nvidia-lowlatency | 6.8.0-1035.38.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra | 5.15.0-1037.37 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-nvidia-tegra | 6.8.0-1009.9 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra-igx | 5.15.0-1026.26 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-oem-6.11 | 6.11.0-1022.22 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-oem-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-oem-6.8 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-oracle | 5.15.0-1081.87 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-oracle | 6.8.0-1032.33 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-oracle | 6.8.0-1032.33 | USN-7703-3 |
| Ubuntu:22.04:LTS | linux-oracle-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-oracle-6.8 | 6.8.0-1032.33~22.04.1 | USN-7703-3 |
| Ubuntu:22.04:LTS | linux-oracle-6.8 | 6.8.0-1032.33~22.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-raspi | 5.15.0-1078.81 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-raspi | 6.8.0-1035.39 | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-raspi | 6.8.0-1035.39 | USN-7703-4 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-riscv-5.19 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-riscv-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-riscv-6.8 | 6.8.0-78.78~22.04.1 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-starfive-5.19 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-starfive-6.5 | no fix listed | UBUNTU-CVE-2025-21766 |
| Ubuntu:24.04:LTS | linux-xilinx | 6.8.0-1017.18 | UBUNTU-CVE-2025-21766 |
| Ubuntu:22.04:LTS | linux-xilinx-zynqmp | 5.15.0-1050.54 | UBUNTU-CVE-2025-21766 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 2fbc6e89b2f1403189e624cabaf73e189c5e50c6 – before ce3c6165fce0f06305c806696882a3ad4b90e33f2fbc6e89b2f1403189e624cabaf73e189c5e50c6 – before ea07480b23225942208f1b754fea1e7ec486d37e2fbc6e89b2f1403189e624cabaf73e189c5e50c6 – before 9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c42fbc6e89b2f1403189e624cabaf73e189c5e50c6 – before 4583748b65dee4d61bd50a2214715b4237bc152a2fbc6e89b2f1403189e624cabaf73e189c5e50c6 – before a39f61d212d822b3062d7f70fa0588e50e55664e2fbc6e89b2f1403189e624cabaf73e189c5e50c6 – before 139512191bd06f1b496117c76372b2ce372c9a41f415c264176e6095e9dee823e09c5bdd0ee0d33798776a365da509ad923083ae54b38ee521c52742 |
| Linux | Linux | 5.9 |
References
- https://git.kernel.org/stable/c/ce3c6165fce0f06305c806696882a3ad4b90e33f
- https://git.kernel.org/stable/c/ea07480b23225942208f1b754fea1e7ec486d37e
- https://git.kernel.org/stable/c/9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4
- https://git.kernel.org/stable/c/4583748b65dee4d61bd50a2214715b4237bc152a
- https://git.kernel.org/stable/c/a39f61d212d822b3062d7f70fa0588e50e55664e
- https://git.kernel.org/stable/c/139512191bd06f1b496117c76372b2ce372c9a41
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html