CVE-2026-31480

Local system hang via osnoise lock inversion

Published Apr 22, 2026 · Updated Apr 22, 2026

Improper locking in the Linux Kernel osnoise tracer allows local users to hang the system during concurrent CPU hotplug activity. In trace_osnoise.c, osnoise_sleep() takes interface_lock before cpus_read_lock(), while CPU-offline processing holds cpus_write_lock() and waits for an osnoise thread that needs interface_lock. A low-privileged local user must reach the osnoise tracing and CPU-hotplug sequence; the resulting kernel deadlock interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux Kernel osnoise tracer allows local users to hang the system during concurrent CPU hotplug activity. In trace_osnoise.c, osnoise_sleep() takes interface_lock before cpus_read_lock(), while CPU-offline processing holds cpus_write_lock() and waits for an osnoise thread that needs interface_lock. A low-privileged local user must reach the osnoise tracing and CPU-hotplug sequence; the resulting kernel deadlock interrupts the host.

The record

CVE
CVE-2026-31480
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, CAPEC-25, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=5.14
  2. Affected versionversion=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <03474a01c199de17a8e2d39b51df6beb9c76e831
  3. Affected versionversion=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <1f9885732248d22f788e4992c739a98c88ab8a55
  4. Affected versionversion=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9f
  5. Affected versionversion=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <7aa095ce7d224308cb6979956f0de8607df93d4f
  6. Affected versionversion=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <cf929c21eeed5bd39873fb14bfdfff963fa6f1da
  7. Affected versionversion=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <ef41a85a55022e27cdaebf22a6676910b66f65aa
  8. Affected versionversion=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.14; version=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <03474a01c199de17a8e2d39b51df6beb9c76e831; version=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <1f9885732248d22f788e4992c739a98c88ab8a55; version=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <7a41d4633cd2c15eb5ed31e8f3b16910e50a8c9f; version=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <7aa095ce7d224308cb6979956f0de8607df93d4f; version=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <cf929c21eeed5bd39873fb14bfdfff963fa6f1da; version=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <ef41a85a55022e27cdaebf22a6676910b66f65aa; version=bce29ac9ce0bb0b0b146b687ab978378c21e9078 <f278b8ebf7eba2a1699cfc7bf30dd3ef898d60d7

Published CVSS scores

5.5NIST NVDCVSS: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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
CAPEC-25Forced Deadlock
T1499.004Endpoint Denial of Service: Application 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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