CVE-2022-49054 (GCVE-0-2022-49054)
Vulnerability from cvelistv5
Published
2025-02-26 01:54
Modified
2026-08-05 08:53
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Summary
In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests hv_panic_page might contain guest-sensitive information, do not dump it over to Hyper-V by default in isolated guests. While at it, update some comments in hyperv_{panic,die}_event().
References
Impacted products
Vendor Product Version
Linux Linux Version: a6c76bb08dc7f7ff2b1c381002eb6c7211746182
Version: a6c76bb08dc7f7ff2b1c381002eb6c7211746182
Version: a6c76bb08dc7f7ff2b1c381002eb6c7211746182
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hv/vmbus_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1b576e81d31b56b248316b8ff816b1cc5c4407c7",
              "status": "affected",
              "version": "a6c76bb08dc7f7ff2b1c381002eb6c7211746182",
              "versionType": "git"
            },
            {
              "lessThan": "6230bc50d6d21cae4c084766623d0a6d17958721",
              "status": "affected",
              "version": "a6c76bb08dc7f7ff2b1c381002eb6c7211746182",
              "versionType": "git"
            },
            {
              "lessThan": "9f8b577f7b43b2170628d6c537252785dcc2dcea",
              "status": "affected",
              "version": "a6c76bb08dc7f7ff2b1c381002eb6c7211746182",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/hv/vmbus_drv.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.35",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.4",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18",
                  "versionStartIncluding": "5.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests\n\nhv_panic_page might contain guest-sensitive information, do not dump it\nover to Hyper-V by default in isolated guests.\n\nWhile at it, update some comments in hyperv_{panic,die}_event()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The leak occurs over the Hyper-V guest crash MSR / panic-page interface between an isolated guest and its host, which is a local hypervisor channel rather than a network or physical attack path.\nAC:L - Whenever a panic occurs with the default-enabled sysctl, hv_kmsg_dump() reliably copies kmsg into hv_panic_page and notifies Hyper-V; no race, special memory layout, or other condition beyond the attacker\u2019s influence is required for the disclosure itself.\nPR:N - The adversarial party is the Hyper-V host outside the isolated guest\u2019s TCB and needs no privileges inside the guest; the guest kernel voluntarily exports the panic page on crash without authentication.\nUI:N - No victim user action is required; the dump runs automatically from the panic/kmsg_dump notifier path when the guest crashes.\nS:C - Isolated guests (SNP/VBS) treat the hypervisor as a separate security authority; disclosing guest kmsg to Hyper-V crosses that confidential-computing boundary, analogous to other guest-to-untrusted-VMM leaks scored with Scope Changed.\nC:H - Up to a full Hyper-V page of kernel log is shared with the host and may contain secrets, credentials, key material, and other sensitive guest data that confidential VMs are meant to withhold from the hypervisor.\nI:N - The bug only discloses existing kmsg contents to the host; it does not modify guest or host integrity or provide a write primitive.\nA:N - The vulnerability does not cause crashes or denial of service; it only improperly exports information when a panic has already occurred for other reasons."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:53:39.023Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1b576e81d31b56b248316b8ff816b1cc5c4407c7"
        },
        {
          "url": "https://git.kernel.org/stable/c/6230bc50d6d21cae4c084766623d0a6d17958721"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f8b577f7b43b2170628d6c537252785dcc2dcea"
        }
      ],
      "title": "Drivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49054",
    "datePublished": "2025-02-26T01:54:27.286Z",
    "dateReserved": "2025-02-26T01:49:39.243Z",
    "dateUpdated": "2026-08-05T08:53:39.023Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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