CVE-2026-46298

System hang via interrupt-reentrant spinlock deadlock

Published Jun 8, 2026 · Updated Jun 8, 2026

Race condition in Linux Kernel 6.18 allows local users to hang affected PowerPC pseries systems through papr-hvpipe operations. The ioctl and release paths take hvpipe_src_list_lock without disabling local interrupts, so a same-CPU message interrupt re-enters the lock and deadlocks. The papr-hvpipe device is specific to supported pseries firmware and defaults to mode 0600, making root access necessary to reach the system-wide hang.

CVSS severity4.7
Medium
EPSS probability0.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel 6.18 allows local users to hang affected PowerPC pseries systems through papr-hvpipe operations. The ioctl and release paths take hvpipe_src_list_lock without disabling local interrupts, so a same-CPU message interrupt re-enters the lock and deadlocks. The papr-hvpipe device is specific to supported pseries firmware and defaults to mode 0600, making root access necessary to reach the system-wide hang.

The record

CVE
CVE-2026-46298
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-364, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 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=6.18
  2. Affected versionversion=814ef095f12c9fa142043ee689500f3a41bb6dab <342c966f81cfc3cb6c297e80b37a9f3a5d637d2c
  3. Affected versionversion=814ef095f12c9fa142043ee689500f3a41bb6dab <7a4f0846ee6cc8cf44ae0046ed42e3259d1dd45b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.18; version=814ef095f12c9fa142043ee689500f3a41bb6dab <342c966f81cfc3cb6c297e80b37a9f3a5d637d2c; version=814ef095f12c9fa142043ee689500f3a41bb6dab <7a4f0846ee6cc8cf44ae0046ed42e3259d1dd45b

Published CVSS scores

4.7UbuntuCVSS:3.1/AV:L/AC:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-364Signal Handler Race Condition
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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