CVE-2025-21659
8.1 · HIGHOverview
CVE-2025-21659 is a high-severity vulnerability affecting linux linux_kernel. It was published on January 21, 2025 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
In the Linux kernel, the following vulnerability has been resolved:
netdev: prevent accessing NAPI instances from another namespace
The NAPI IDs were not fully exposed to user space prior to the netlink
API, so they were never namespaced. The netlink API must ensure that
at the very least NAPI instance belongs to the same netns as the owner
of the genl sock.
napi_by_id() can become static now, but it needs to move because of
dev_get_by_napi_id().
Remediation
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| linux | linux_kernel | >= 6.8, < 6.12.10 | Affected |
Frequently Asked Questions
What is CVE-2025-21659?
CVE-2025-21659 is a high-severity vulnerability affecting linux linux_kernel. It was published on January 21, 2025 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2025-21659?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-21659?
Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-21659?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-21659 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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