CVE-2026-99216 (GCVE-0-2026-99216)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:36 – Updated: 2026-10-31 12:45
VLAI
Title
Drivers: hv: Don't reset VMBus connection state on error/exit paths
Summary
In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: Don't reset VMBus connection state on error/exit paths In two places, current code forces vmbus_connection.conn_state to DISCONNECTED prior to calling vmbus_disconnect(). But vmbus_disconnect() calls vmbus_initiate_unload(), which unloads the VMBus connection only if the conn_state is CONNECTED. Consequently, the connection remains and the Hyper-V host might continue to send messages or post VMBus interrupts. The problem was introduced in commit 74347a99e73ae ("x86/Hyper-V: Unload vmbus channel in hv panic callback"), in that vmbus_initiate_unload() started checking the current connection state before doing the unload. This commit removed some occurrences where conn_state was forced to DISCONNECTED, but these two remained, apparently due to an oversight at the time. Fix this by not forcing conn_state to DISCONNECTED during VMBus exit, or if a failure occurs when establishing the connection in the first place. Whatever value conn_state has at the time is then read by vmbus_initiate_unload() to determine if there is a connection to be unloaded.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 74347a99e73ae00b8385f1209aaea193c670f901 , < 2939215d57bc8e4189290544fca78f3809ac3ef8 (git)
Affected: 74347a99e73ae00b8385f1209aaea193c670f901 , < a0ae955ba9a5067a157ebb8defb4a0a9cb1fc304 (git)
Affected: 74347a99e73ae00b8385f1209aaea193c670f901 , < deef3ab5129ae4c45662c957cdab3739eb047fb1 (git)
Affected: 74347a99e73ae00b8385f1209aaea193c670f901 , < 2e5ffbf1e41abbf6e02ce28115107938f55ff646 (git)
Affected: 74347a99e73ae00b8385f1209aaea193c670f901 , < 2732210132f92aca0622b5134027990a809279d5 (git)
Affected: 74347a99e73ae00b8385f1209aaea193c670f901 , < f47ce27af80b87cc684d5c12b65506af498ac7e5 (git)
Affected: 74347a99e73ae00b8385f1209aaea193c670f901 , < 3195546a377c2d8d176d837e8baad5ce15d11195 (git)
Affected: 74347a99e73ae00b8385f1209aaea193c670f901 , < ec31dc39e835ccde0930daccece8c492d28282fc (git)
Affected: 5e059fc0f054309036d3f612bc8b0a502ca58545 (git)
Affected: 9f38f7b46de0747c1909e8c557aa21715dce20c5 (git)
Affected: caeeb3787167c884b955404a7e669fd77f267e44 (git)
Affected: 4.19.118 , < 4.20 (semver)
Affected: 5.4.35 , < 5.5 (semver)
Affected: 5.6.7 , < 5.7 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.161 , ≤ 6.6.* (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: hv: Don\u0027t reset VMBus connection state on error/exit paths\n\nIn two places, current code forces vmbus_connection.conn_state to\nDISCONNECTED prior to calling vmbus_disconnect(). But vmbus_disconnect()\ncalls vmbus_initiate_unload(), which unloads the VMBus connection\nonly if the conn_state is CONNECTED. Consequently, the connection\nremains and the Hyper-V host might continue to send messages or post\nVMBus interrupts.\n\nThe problem was introduced in commit 74347a99e73ae (\"x86/Hyper-V:\nUnload vmbus channel in hv panic callback\"), in that\nvmbus_initiate_unload() started checking the current connection\nstate before doing the unload. This commit removed some occurrences\nwhere conn_state was forced to DISCONNECTED, but these two remained,\napparently due to an oversight at the time.\n\nFix this by not forcing conn_state to DISCONNECTED during VMBus exit,\nor if a failure occurs when establishing the connection in the first\nplace. Whatever value conn_state has at the time is then read by\nvmbus_initiate_unload() to determine if there is a connection to\nbe unloaded."
        }
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      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The attacker-controlled CHANNELMSG_VERSION_RESPONSE reaches vmbus_connect() through sysvec_hyperv_callback, vmbus_isr(), vmbus_on_msg_dpc(), and vmbus_onversion_response(); this is local Hyper-V IPC, not a network or physical protocol.\nAC:L - A backend can reject versions through 5.2, accept 5.1 in an isolation guest, then post rescind messages while the patched vmbus_connect() cleanup destroys its queues. The same backend controls both the state setup and racing messages.\nPR:N - vmbus_onversion_response() accepts the Hyper-V parent\u0027s VERSION_RESPONSE from the SynIC message page without guest credentials, capabilities, or authentication; the backend needs no privilege inside the guest.\nUI:N - hv_acpi_init() automatically calls vmbus_bus_init(), vmbus_alloc_synic_and_connect(), and vmbus_connect() during driver initialization; the backend supplies the responses without any victim action.\nS:U - The stale rescind_work_queue/work_queue accesses and resulting corruption occur within the same guest kernel that contains the vulnerable VMBus driver; no guest-to-host escape or IOMMU boundary bypass is produced.\nC:H - Without CHANNELMSG_UNLOAD, __vmbus_on_msg_dpc() can queue a rescind through a workqueue already RCU-freed by vmbus_disconnect(); this kernel heap use-after-free permits object reuse and guest-kernel memory disclosure.\nI:H - queue_work() dereferences the freed workqueue\u0027s cpu_pwq and updates pool counters and work-list state, so reuse of that storage can turn continued host messages into kernel heap writes and control-flow corruption.\nA:H - Continued rescind or offer messages can make __queue_work() access a destroyed or freed workqueue before hv_synic_cleanup() disables the SynIC, causing a warning, invalid-pointer fault, kernel oops, or panic."
            }
          ]
        }
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        "dateUpdated": "2026-10-31T12:45:15.499Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2939215d57bc8e4189290544fca78f3809ac3ef8"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0ae955ba9a5067a157ebb8defb4a0a9cb1fc304"
        },
        {
          "url": "https://git.kernel.org/stable/c/deef3ab5129ae4c45662c957cdab3739eb047fb1"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e5ffbf1e41abbf6e02ce28115107938f55ff646"
        },
        {
          "url": "https://git.kernel.org/stable/c/2732210132f92aca0622b5134027990a809279d5"
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        {
          "url": "https://git.kernel.org/stable/c/f47ce27af80b87cc684d5c12b65506af498ac7e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/3195546a377c2d8d176d837e8baad5ce15d11195"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec31dc39e835ccde0930daccece8c492d28282fc"
        }
      ],
      "title": "Drivers: hv: Don\u0027t reset VMBus connection state on error/exit paths",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99216",
    "datePublished": "2026-10-28T10:36:09.383Z",
    "dateReserved": "2026-09-25T10:25:14.401Z",
    "dateUpdated": "2026-10-31T12:45:15.499Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-99216",
      "date": "2026-11-02",
      "epss": "0.00137",
      "percentile": "0.0308"
    },
    "microsoft_vex": {
      "current_release_date": "2026-11-01T14:54:12.000Z",
      "cve": "CVE-2026-99216",
      "id": "msrc_CVE-2026-99216",
      "initial_release_date": "2026-10-29T01:09:04.000Z",
      "product_status:known_affected": "2",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Drivers: hv: Don\u0027t reset VMBus connection state on error/exit paths",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99216.json",
      "version": "2"
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              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nDrivers: hv: Don\u0027t reset VMBus connection state on error/exit paths\n\nIn two places, current code forces vmbus_connection.conn_state to\nDISCONNECTED prior to calling vmbus_disconnect(). But vmbus_disconnect()\ncalls vmbus_initiate_unload(), which unloads the VMBus connection\nonly if the conn_state is CONNECTED. Consequently, the connection\nremains and the Hyper-V host might continue to send messages or post\nVMBus interrupts.\n\nThe problem was introduced in commit 74347a99e73ae (\"x86/Hyper-V:\nUnload vmbus channel in hv panic callback\"), in that\nvmbus_initiate_unload() started checking the current connection\nstate before doing the unload. This commit removed some occurrences\nwhere conn_state was forced to DISCONNECTED, but these two remained,\napparently due to an oversight at the time.\n\nFix this by not forcing conn_state to DISCONNECTED during VMBus exit,\nor if a failure occurs when establishing the connection in the first\nplace. Whatever value conn_state has at the time is then read by\nvmbus_initiate_unload() to determine if there is a connection to\nbe unloaded."
          }
        ],
        "id": "CVE-2026-99216",
        "lastModified": "2026-10-31T13:17:59.777",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-28T11:17:43.160",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2732210132f92aca0622b5134027990a809279d5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2939215d57bc8e4189290544fca78f3809ac3ef8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2e5ffbf1e41abbf6e02ce28115107938f55ff646"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3195546a377c2d8d176d837e8baad5ce15d11195"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a0ae955ba9a5067a157ebb8defb4a0a9cb1fc304"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/deef3ab5129ae4c45662c957cdab3739eb047fb1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ec31dc39e835ccde0930daccece8c492d28282fc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f47ce27af80b87cc684d5c12b65506af498ac7e5"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-31T15:46:13+00:00",
      "cve": "CVE-2026-99216",
      "id": "CVE-2026-99216",
      "initial_release_date": "2026-10-28T00:00:00+00:00",
      "product_status:known_affected": "279",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Drivers: hv: Don\u0027t reset VMBus connection state on error/exit paths",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99216.json",
      "version": "3"
    }
  }
}



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