CVE-2025-21766

8.1 HIGH 0.6% exploit odds Fix listed Other OS & kernel

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 0.6% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2025-02-27 03:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-15 22:18 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.6% in the next 30 days (EPSS).
Severity: 8.1 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2025-02-27 03:15 UTC
Last modified: 2026-10-15 22:18 UTC
Exploit probability: 0.6% · EPSS, next 30 days
Record status: Modified

Affected

Linux Kernel < 4.15
Linux Kernel < 4.20
Linux Kernel < 5.5
Linux Kernel < 5.9
Linux Kernel < 5.15.179
Linux Kernel < 6.1.129
Linux Kernel < 6.6.79
Linux Kernel < 6.12.16

Attack profile CVSS 3.1 · 8.1

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2025-21766.md and follow it. Check whether this project is affected by CVE-2025-21766. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record