CVE-2025-21659

netdev: prevent accessing NAPI instances from another namespace

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().

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/b683ba0df11ff563cc237eb1b74d6adfa77226bf
https://git.kernel.org/stable/c/d1cacd74776895f6435941f86a1130e58f6dd226

Frequently Asked Questions

What is the severity of CVE-2025-21659?: CVE-2025-21659 has not yet been assigned a CVSS score.
How to fix CVE-2025-21659?: To fix CVE-2025-21659, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21659 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-21659 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21659?: CVE-2025-21659 affects Linux Linux, Linux Linux.

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