FKIE_CVE-2025-40160

Vulnerability from fkie_nvd - Published: 2025-11-12 11:15 - Updated: 2026-06-17 09:21
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/07ce121d93a5e5fb2440a24da3dbf408fcee978e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/612ef6056855c0aacb9b25d1d853c435754483f7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a1e7f07ae6b594f1ba5be46c6125b43bc505c5aa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f81db055a793eca9d05f79658ff62adafb41d664
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/events/events_base.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "612ef6056855c0aacb9b25d1d853c435754483f7",
              "status": "affected",
              "version": "62cc5fc7b2e0218144e162afb8191db9b924b5e6",
              "versionType": "git"
            },
            {
              "lessThan": "a1e7f07ae6b594f1ba5be46c6125b43bc505c5aa",
              "status": "affected",
              "version": "62cc5fc7b2e0218144e162afb8191db9b924b5e6",
              "versionType": "git"
            },
            {
              "lessThan": "f81db055a793eca9d05f79658ff62adafb41d664",
              "status": "affected",
              "version": "62cc5fc7b2e0218144e162afb8191db9b924b5e6",
              "versionType": "git"
            },
            {
              "lessThan": "07ce121d93a5e5fb2440a24da3dbf408fcee978e",
              "status": "affected",
              "version": "62cc5fc7b2e0218144e162afb8191db9b924b5e6",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/xen/events/events_base.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.2"
            },
            {
              "lessThan": "3.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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."
    }
  ],
  "id": "CVE-2025-40160",
  "lastModified": "2026-06-17T09:21:22.933",
  "metrics": {},
  "published": "2025-11-12T11:15:46.123",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/07ce121d93a5e5fb2440a24da3dbf408fcee978e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/612ef6056855c0aacb9b25d1d853c435754483f7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a1e7f07ae6b594f1ba5be46c6125b43bc505c5aa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f81db055a793eca9d05f79658ff62adafb41d664"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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