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CVE-2025-21765

MEDIUMCVSS 5.5/10EPSS 0.20%

Last modified

CVE-2025-21765 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU protection in ip6_default_advmss() ip6_default_advmss() needs rcu protection to make sure the net structure it reads does not disappear.. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU protection in ip6_default_advmss() ip6_default_advmss() needs rcu protection to make sure the net structure it reads does not disappear.

Metrics

CVSS 3.1
5.5/10

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

EPSS Probability
0.20%

10.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersionsUpdate
LinuxLinux Kernel>= 2.6.26, < 5.4.291—
LinuxLinux Kernel>= 5.5, < 5.10.235—
LinuxLinux Kernel>= 5.11, < 5.15.179—
LinuxLinux Kernel>= 5.16, < 6.1.129—
LinuxLinux Kernel>= 6.2, < 6.6.79—
LinuxLinux Kernel>= 6.7, < 6.12.16—
LinuxLinux Kernel>= 6.13, < 6.13.4—
LinuxLinux Kernel6.14Rc1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2025-21765?
In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU protection in ip6_default_advmss() ip6_default_advmss() needs rcu protection to make sure the net structure it reads does not disappear.
How severe is CVE-2025-21765?
CVE-2025-21765 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2025-21765?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-21765?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST