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CVE-2026-80660

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (occ) unregister sysfs devices outside occ lock

occ_active(false) and occ_shutdown() unregister sysfs-backed devices while occ->lock is held. hwmon_device_unregister() and sysfs_remove_group() can wait for active sysfs callbacks to drain, and those callbacks can enter the OCC update path and try to take occ->lock again. That gives the unregister paths the lock ordering occ->lock -> sysfs callback drain, while a callback has the opposite edge sysfs callback -> occ->lock.

This issue was found by our static analysis tool and then manually reviewed against the current tree.

Leer descripción completaMostrar menos

The grounded PoC kept the real unregister and callback carrier:

Lockdep reported the circular dependency with occ_shutdown() already holding the OCC mutex and hwmon_device_unregister() waiting on the sysfs side:

Serialize hwmon registration and removal with a separate hwmon_lock. Under that lock, detach occ->hwmon and update occ->active while occ->lock is held so concurrent OCC state changes still see a stable state, then drop occ->lock before calling hwmon_device_unregister(). Remove the driver sysfs group before taking occ->lock in occ_shutdown(), so draining the driver attributes cannot wait while the OCC mutex is held. Also make OCC update callbacks return -ENODEV after deactivation, so callbacks that already passed sysfs active protection do not poll the hardware after teardown has detached the hwmon device.

Detalles técnicos trazas, registros y código del informe original
  occ_shutdown()
  hwmon_device_unregister()
  occ_show_temp_1()
  occ_update_response()

  WARNING: possible circular locking dependency detected
  ... (sysfs_lock) ... at: hwmon_device_unregister+0x12/0x30 [vuln_msv]
  ... (&test_occ.lock) ... at: occ_shutdown.constprop.0+0xe/0x40 [vuln_msv]
  occ_update_response.isra.0+0xb/0x20 [vuln_msv]
  occ_show_temp_1.constprop.0.isra.0+0x23/0x40 [vuln_msv]
  *** DEADLOCK ***

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-80660",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "849b0156d9960da628a06756bb920d9571c15e66",
              "lessThan": "2a4c80ff3571498ec6a916273304b6650026b1b0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "849b0156d9960da628a06756bb920d9571c15e66",
              "lessThan": "e7fd81e9fb1fe476d2131fec66c1138457810ed4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "849b0156d9960da628a06756bb920d9571c15e66",
              "lessThan": "2092952f22a7da98e76e84139ae202b1fc7ba899",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "849b0156d9960da628a06756bb920d9571c15e66",
              "lessThan": "f0aad157576da199c146c1bb266442befa7912ca",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "849b0156d9960da628a06756bb920d9571c15e66",
              "lessThan": "7ee43ec8e6774774abbe9dc3027225e01bc964a5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "849b0156d9960da628a06756bb920d9571c15e66",
              "lessThan": "e31408734332b8cc611342cdaaab6ba492180156",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "bc8a32726774286325b0cb0daab55b682cafc1ef",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.15.216",
              "lessThan": "5.16",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/hwmon/occ/common.c",
            "drivers/hwmon/occ/common.h"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/hwmon/occ/common.c",
            "drivers/hwmon/occ/common.h"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-28T08:16:51.160",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/2092952f22a7da98e76e84139ae202b1fc7ba899",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2a4c80ff3571498ec6a916273304b6650026b1b0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7ee43ec8e6774774abbe9dc3027225e01bc964a5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e31408734332b8cc611342cdaaab6ba492180156",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e7fd81e9fb1fe476d2131fec66c1138457810ed4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f0aad157576da199c146c1bb266442befa7912ca",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (occ) unregister sysfs devices outside occ lock\n\nocc_active(false) and occ_shutdown() unregister sysfs-backed devices while\nocc->lock is held.  hwmon_device_unregister() and sysfs_remove_group() can\nwait for active sysfs callbacks to drain, and those callbacks can enter the\nOCC update path and try to take occ->lock again.  That gives the unregister\npaths the lock ordering occ->lock -> sysfs callback drain, while a callback\nhas the opposite edge sysfs callback -> occ->lock.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the real unregister and callback carrier:\n\n  occ_shutdown()\n  hwmon_device_unregister()\n  occ_show_temp_1()\n  occ_update_response()\n\nLockdep reported the circular dependency with occ_shutdown() already\nholding the OCC mutex and hwmon_device_unregister() waiting on the sysfs\nside:\n\n  WARNING: possible circular locking dependency detected\n  ... (sysfs_lock) ... at: hwmon_device_unregister+0x12/0x30 [vuln_msv]\n  ... (&test_occ.lock) ... at: occ_shutdown.constprop.0+0xe/0x40 [vuln_msv]\n  occ_update_response.isra.0+0xb/0x20 [vuln_msv]\n  occ_show_temp_1.constprop.0.isra.0+0x23/0x40 [vuln_msv]\n  *** DEADLOCK ***\n\nSerialize hwmon registration and removal with a separate hwmon_lock.\nUnder that lock, detach occ->hwmon and update occ->active while occ->lock\nis held so concurrent OCC state changes still see a stable state, then\ndrop occ->lock before calling hwmon_device_unregister().  Remove the\ndriver sysfs group before taking occ->lock in occ_shutdown(), so draining\nthe driver attributes cannot wait while the OCC mutex is held.  Also make\nOCC update callbacks return -ENODEV after deactivation, so callbacks that\nalready passed sysfs active protection do not poll the hardware after\nteardown has detached the hwmon device."
    }
  ],
  "lastModified": "2026-08-28T08:16:51.160",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}