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CVE-2025-40160 (GCVE-0-2025-40160)

Vulnerability from cvelistv5 – Published: 2025-11-12 10:24 – Updated: 2026-05-11 21:43
VLAI
Title
xen/events: Return -EEXIST for bound VIRQs
Summary
In the Linux kernel, the following vulnerability has been resolved: xen/events: Return -EEXIST for bound VIRQs Change find_virq() to return -EEXIST when a VIRQ is bound to a different CPU than the one passed in. With that, remove the BUG_ON() from bind_virq_to_irq() to propogate the error upwards. Some VIRQs are per-cpu, but others are per-domain or global. Those must be bound to CPU0 and can then migrate elsewhere. The lookup for per-domain and global will probably fail when migrated off CPU 0, especially when the current CPU is tracked. This now returns -EEXIST instead of BUG_ON(). A second call to bind a per-domain or global VIRQ is not expected, but make it non-fatal to avoid trying to look up the irq, since we don't know which per_cpu(virq_to_irq) it will be in.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 62cc5fc7b2e0218144e162afb8191db9b924b5e6 , < 612ef6056855c0aacb9b25d1d853c435754483f7 (git)
Affected: 62cc5fc7b2e0218144e162afb8191db9b924b5e6 , < a1e7f07ae6b594f1ba5be46c6125b43bc505c5aa (git)
Affected: 62cc5fc7b2e0218144e162afb8191db9b924b5e6 , < f81db055a793eca9d05f79658ff62adafb41d664 (git)
Affected: 62cc5fc7b2e0218144e162afb8191db9b924b5e6 , < 07ce121d93a5e5fb2440a24da3dbf408fcee978e (git)
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Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 6.6.113 , ≤ 6.6.* (semver)
Unaffected: 6.12.54 , ≤ 6.12.* (semver)
Unaffected: 6.17.4 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/events/events_base.c"
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxen/events: Return -EEXIST for bound VIRQs\n\nChange find_virq() to return -EEXIST when a VIRQ is bound to a\ndifferent CPU than the one passed in.  With that, remove the BUG_ON()\nfrom bind_virq_to_irq() to propogate the error upwards.\n\nSome VIRQs are per-cpu, but others are per-domain or global.  Those must\nbe bound to CPU0 and can then migrate elsewhere.  The lookup for\nper-domain and global will probably fail when migrated off CPU 0,\nespecially when the current CPU is tracked.  This now returns -EEXIST\ninstead of BUG_ON().\n\nA second call to bind a per-domain or global VIRQ is not expected, but\nmake it non-fatal to avoid trying to look up the irq, since we don\u0027t\nknow which per_cpu(virq_to_irq) it will be in."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:43:53.978Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/612ef6056855c0aacb9b25d1d853c435754483f7"
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        {
          "url": "https://git.kernel.org/stable/c/07ce121d93a5e5fb2440a24da3dbf408fcee978e"
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      "title": "xen/events: Return -EEXIST for bound VIRQs",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40160",
    "datePublished": "2025-11-12T10:24:36.429Z",
    "dateReserved": "2025-04-16T07:20:57.176Z",
    "dateUpdated": "2026-05-11T21:43:53.978Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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    "redhat_vex": {
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      "version": "3"
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      "cve": "CVE-2025-40160",
      "id": "CVE-2025-40160",
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      "product_status:first_fixed": "2",
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      "product_status:recommended": "326",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40160",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40160.json",
      "version": "47"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.