CVE-2025-40160 (GCVE-0-2025-40160)
Vulnerability from cvelistv5
Published
2025-11-12 10:24
Modified
2025-11-12 10:24
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
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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",
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              "versionType": "git"
            }
          ]
        },
        {
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          "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": [
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              "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-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
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                {
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                  "versionEndExcluding": "6.17.4",
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                {
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                  "versionEndExcluding": "6.18-rc1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2025-11-12T10:24:36.429Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40160",
    "datePublished": "2025-11-12T10:24:36.429Z",
    "dateReserved": "2025-04-16T07:20:57.176Z",
    "dateUpdated": "2025-11-12T10:24:36.429Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40160\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T11:15:46.123\",\"lastModified\":\"2025-11-12T16:19:12.850\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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