CVE-2026-31670 net: rfkill: prevent unlimited numbers of rfkill events from being created

What is CVE-2026-31670?

CVE-2026-31670 is a medium-severity denial of service vulnerability in Linux kernel, published on 24 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

net: rfkill: prevent unlimited numbers of rfkill events from being created

Userspace can create an unlimited number of rfkill events if the system is so configured, while not consuming them from the rfkill file descriptor, causing a potential out of memory situation. Prevent this from bounding the number of pending rfkill events at a "large" number (i.e. 1000) to prevent abuses like this.

Which versions are affected by CVE-2026-31670?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31670?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-31670 being exploited?

There is no known exploitation of CVE-2026-31670 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-83741, BELL-CVE-2026-31670, DEBIAN-CVE-2026-31670, GHSA-8qfv-g522-p5wr, ROOT-OS-DEBIAN-11-CVE-2026-31670, ROOT-OS-DEBIAN-12-CVE-2026-31670 and 3 more.