CVE-2026-31670

Local memory exhaustion via unbounded rfkill events

Published Apr 24, 2026 · Updated Apr 24, 2026

Resource exhaustion in Linux Kernel 2.6.31 and later allows local users to exhaust memory through unconsumed rfkill events. The rfkill event path in net/rfkill/core.c queues a new event for each eligible userspace-triggered state change without limiting the number retained for an unread rfkill file descriptor. Exploitation requires low-privileged local access, an rfkill-enabled system, and an open descriptor whose pending events are not consumed; sustained allocation can interrupt the system through out-of-memory handling.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Linux Kernel 2.6.31 and later allows local users to exhaust memory through unconsumed rfkill events. The rfkill event path in net/rfkill/core.c queues a new event for each eligible userspace-triggered state change without limiting the number retained for an unread rfkill file descriptor. Exploitation requires low-privileged local access, an rfkill-enabled system, and an open descriptor whose pending events are not consumed; sustained allocation can interrupt the system through out-of-memory handling.

The record

CVE
CVE-2026-31670
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4bcd1615a4e2a185ae9edd27b4143d7dfa7134f4
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <673d2a3eef6e0ee9736501a150c9e4024a4e60a6
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80ce4cb026f0a4c4532b6cad827b44debda6256a
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <82843afc19012a29ba863961ef494165aa1a88f4
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a8c26800e0220e1550af012f5a20e50f5c78864d
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b1e0c8d3ab58a0161db487bf5fc47adfcaf5d5ca
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e3842779547c83150569071d9980517cc9029fc0
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea245d78dec594372e27d8c79616baf49e98a4a1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4bcd1615a4e2a185ae9edd27b4143d7dfa7134f4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <673d2a3eef6e0ee9736501a150c9e4024a4e60a6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80ce4cb026f0a4c4532b6cad827b44debda6256a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <82843afc19012a29ba863961ef494165aa1a88f4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a8c26800e0220e1550af012f5a20e50f5c78864d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b1e0c8d3ab58a0161db487bf5fc47adfcaf5d5ca; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e3842779547c83150569071d9980517cc9029fc0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ea245d78dec594372e27d8c79616baf49e98a4a1

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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