CVE-2025-40160

Kernel crash via repeated migrated VIRQ binding

Published Nov 12, 2025 · Updated May 11, 2026

A denial-of-service flaw in Linux Xen event handling allows attackers to crash the kernel through repeated VIRQ binding. The find_virq() lookup checks the requested CPU's per-CPU map, misses a migrated per-domain or global VIRQ, and lets bind_virq_to_irq() reach BUG_ON() for an already-bound IRQ. The trigger requires Xen and an unexpected second bind after migration from CPU0; the record identifies no attacker-controlled path or required privilege.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A denial-of-service flaw in Linux Xen event handling allows attackers to crash the kernel through repeated VIRQ binding. The find_virq() lookup checks the requested CPU's per-CPU map, misses a migrated per-domain or global VIRQ, and lets bind_virq_to_irq() reach BUG_ON() for an already-bound IRQ. The trigger requires Xen and an unexpected second bind after migration from CPU0; the record identifies no attacker-controlled path or required privilege.

The record

CVE
CVE-2025-40160
Published
Nov 12, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Nov 12, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.2
  2. Affected versionversion=62cc5fc7b2e0218144e162afb8191db9b924b5e6 <07ce121d93a5e5fb2440a24da3dbf408fcee978e
  3. Affected versionversion=62cc5fc7b2e0218144e162afb8191db9b924b5e6 <612ef6056855c0aacb9b25d1d853c435754483f7
  4. Affected versionversion=62cc5fc7b2e0218144e162afb8191db9b924b5e6 <a1e7f07ae6b594f1ba5be46c6125b43bc505c5aa
  5. Affected versionversion=62cc5fc7b2e0218144e162afb8191db9b924b5e6 <f81db055a793eca9d05f79658ff62adafb41d664

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=62cc5fc7b2e0218144e162afb8191db9b924b5e6 <07ce121d93a5e5fb2440a24da3dbf408fcee978e; version=62cc5fc7b2e0218144e162afb8191db9b924b5e6 <612ef6056855c0aacb9b25d1d853c435754483f7; version=62cc5fc7b2e0218144e162afb8191db9b924b5e6 <a1e7f07ae6b594f1ba5be46c6125b43bc505c5aa; version=62cc5fc7b2e0218144e162afb8191db9b924b5e6 <f81db055a793eca9d05f79658ff62adafb41d664

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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