CVE-2025-21766

MediumCVSS 5.5/10Last modified Oct 15, 2026

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.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < ce3c6165fce0f06305c806696882a3ad4b90e33f; >= 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < ea07480b23225942208f1b754fea1e7ec486d37e; >= 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < 9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4; >= 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < 4583748b65dee4d61bd50a2214715b4237bc152a; >= 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < a39f61d212d822b3062d7f70fa0588e50e55664e; >= 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < 139512191bd06f1b496117c76372b2ce372c9a41; f415c264176e6095e9dee823e09c5bdd0ee0d337; 98776a365da509ad923083ae54b38ee521c52742; 860e2cc78c697c95bc749abb20047239fa1722ea; 2b1be6c925cdf4638811765a9160796291494b89; >= 4.14.200, < 4.15; >= 4.19.148, < 4.20; >= 5.4.68, < 5.5; >= 5.8.12, < 5.9
LinuxLinux5.9
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.5, < *
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.5, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP>= V3.1.5, < *
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFP>= V3.1.5, < *
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystem< *
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFP>= V3.1.5, < *

References

Timeline

Published
Feb 27, 2025
Last modified
Oct 15, 2026
NVD status
Modified

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CVE-2025-21766: Medium severity, CVSS 5.5 | Vulnix