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

Vulnerability from cvelistv5 – Published: 2025-11-12 10:24 – Updated: 2026-10-30 12:22
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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 62cc5fc7b2e0218144e162afb8191db9b924b5e6 , < 7e19b3643855d4b63442bd20e8bb811e1a75998e (git)
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: 6.1.191 , ≤ 6.1.* (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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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/events/events_base.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "version": "6.6.113",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.54",
              "versionType": "semver"
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              "version": "6.17.4",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "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": "2026-10-30T12:22:54.628Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/7e19b3643855d4b63442bd20e8bb811e1a75998e"
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          "url": "https://git.kernel.org/stable/c/612ef6056855c0aacb9b25d1d853c435754483f7"
        },
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          "url": "https://git.kernel.org/stable/c/a1e7f07ae6b594f1ba5be46c6125b43bc505c5aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/f81db055a793eca9d05f79658ff62adafb41d664"
        },
        {
          "url": "https://git.kernel.org/stable/c/07ce121d93a5e5fb2440a24da3dbf408fcee978e"
        }
      ],
      "title": "xen/events: Return -EEXIST for bound VIRQs",
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        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
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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": "2026-10-30T12:22:54.628Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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                "product": "Linux",
                "programFiles": [
                  "drivers/xen/events/events_base.c"
                ],
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                "vendor": "Linux",
                "versions": [
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        "cveTags": [],
        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxen/events: Devolver -EEXIST para VIRQs enlazados\n\nCambiar find_virq() para que devuelva -EEXIST cuando un VIRQ est\u00e1 enlazado a una CPU diferente a la pasada como argumento. Con esto, eliminar el BUG_ON() de bind_virq_to_irq() para propagar el error hacia arriba.\n\nAlgunos VIRQs son por-CPU, pero otros son por-dominio o globales. Esos deben ser enlazados a la CPU0 y luego pueden migrar a otro lugar. La b\u00fasqueda para los por-dominio y globales probablemente fallar\u00e1 cuando se migren fuera de la CPU 0, especialmente cuando se rastrea la CPU actual. Esto ahora devuelve -EEXIST en lugar de BUG_ON().\n\nNo se espera una segunda llamada para enlazar un VIRQ por-dominio o global, pero hacerla no-fatal para evitar intentar buscar la irq, ya que no sabemos en qu\u00e9 per_cpu(virq_to_irq) estar\u00e1."
          }
        ],
        "id": "CVE-2025-40160",
        "lastModified": "2026-10-30T13:18:14.127",
        "metrics": {},
        "published": "2025-11-12T11:15:46.123",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/07ce121d93a5e5fb2440a24da3dbf408fcee978e"
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T02:55:53+00:00",
      "cve": "CVE-2025-40160",
      "id": "CVE-2025-40160",
      "initial_release_date": "2025-11-12T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: xen/events: Return -EEXIST for bound VIRQs",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40160.json",
      "version": "3"
    }
  }
}



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