{
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          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/pmbus/pmbus_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "7.0"
            },
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              "status": "unaffected",
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
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            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.145",
                  "versionStartIncluding": "6.6.143",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
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                  "vulnerable": true
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (pmbus) Fix passing events to regulator core\n\nSashiko reports:\n\nCommit 754bd2b4a084 (\"hwmon: (pmbus/core) Protect regulator operations with\nmutex\") introduced a worker to batch regulator events over time using\natomic_or(). The delayed worker then passes the combined bitmask unmodified\nto regulator_notifier_call_chain().\n\nThe core regulator subsystem\u0027s regulator_handle_critical() function\nevaluates the event parameter using a strict switch statement. If\nmultiple distinct faults occur before the worker runs (e.g.,\nREGULATOR_EVENT_UNDER_VOLTAGE | REGULATOR_EVENT_OVER_CURRENT), the combined\nbitmask fails to match any case. This leaves the reason as NULL and\ncompletely bypasses the critical hw_protection_trigger().\n\nFix the problem by passing events bit by bit to the regulator event\nhandler."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is only reachable through the PMBus SMBALERT threaded IRQ handler (pmbus_fault_handler) that reads hardware fault status over I2C; there is no network, adjacent-radio, or direct physical-device API path, but local actors on PMBus-equipped servers, routers, and embedded boards can induce multi-fault conditions.\nAC:L - _pmbus_get_flags() ORs multiple REGULATOR_EVENT_* bits from a single STATUS read, and pmbus_regulator_notify() further batches concurrent IRQs via atomic_or() before the worker runs, so combined masks like UNDER_VOLTAGE|OVER_CURRENT are produced deterministically without races or layout dependencies the attacker cannot influence.\nPR:L - Triggering the IRQ requires causing real PMBus regulator fault bits (e.g., over-current plus under-voltage during supply stress), which an unprivileged local user can induce through heavy workload and power instability on affected platforms; CAP_NET_ADMIN/user-namespace tricks are not needed and no init-namespace root capability is required.\nUI:N - Once fault conditions are present the SMBALERT IRQ and workqueue fire automatically through pmbus_fault_handler and pmbus_regulator_notify_worker; no separate victim action such as mounting media, plugging hardware, or approving a prompt is required.\nS:U - The impact is bypassing kernel hw_protection_trigger() orderly shutdown/reboot for system-critical PMBus regulators on the same host; it does not cross VM, IOMMU, or sandbox security boundaries and is not a guest-to-host escape.\nC:N - This is a notifier bit-mask logic error that leaves regulator_handle_critical() with a NULL reason; there is no kernel memory corruption, use-after-free, or out-of-bounds access that could disclose pointers or arbitrary memory.\nI:H - When multiple distinct fault events are combined, hw_protection_trigger() is completely skipped for system-critical regulators, defeating the kernel\u0027s mandatory emergency shutdown policy and allowing continued operation under simultaneous critical under-voltage/over-current/fail conditions that can corrupt power hardware.\nA:H - Bypassing hw_protection_trigger() during simultaneous critical PMBus regulator faults prevents the intended emergency orderly_poweroff/reboot, leaving telecom, data-center, and embedded systems running under dangerous rail conditions that can cause hardware failure, forced resets, and sustained denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:43:38.599Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2106bf4056858fcce3624e0c51f6fee4d41d3f2f"
        },
        {
          "url": "https://git.kernel.org/stable/c/48fe43666950efefb7ac5fbdc012c1b3604096bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/489291b6b56978cc50d34e8e13f9636ea296ba8a"
        },
        {
          "url": "https://git.kernel.org/stable/c/b0ff6b6ae9c5183ef701ece7016698bde5a5bfba"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ef7dacd44216bf5ea05c8aef49eba4d145f4047"
        }
      ],
      "title": "hwmon: (pmbus) Fix passing events to regulator core",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72395",
    "datePublished": "2026-08-15T05:56:22.400Z",
    "dateReserved": "2026-08-09T03:40:39.924Z",
    "dateUpdated": "2026-08-17T05:43:38.599Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}