CVE-2026-80660 (GCVE-0-2026-80660)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:49 – Updated: 2026-08-28 06:49
VLAI
Title
hwmon: (occ) unregister sysfs devices outside occ lock
Summary
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. The grounded PoC kept the real unregister and callback carrier: occ_shutdown() hwmon_device_unregister() occ_show_temp_1() occ_update_response() Lockdep reported the circular dependency with occ_shutdown() already holding the OCC mutex and hwmon_device_unregister() waiting on the sysfs side: 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 *** 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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 849b0156d9960da628a06756bb920d9571c15e66 , < 2a4c80ff3571498ec6a916273304b6650026b1b0 (git)
Affected: 849b0156d9960da628a06756bb920d9571c15e66 , < e7fd81e9fb1fe476d2131fec66c1138457810ed4 (git)
Affected: 849b0156d9960da628a06756bb920d9571c15e66 , < 2092952f22a7da98e76e84139ae202b1fc7ba899 (git)
Affected: 849b0156d9960da628a06756bb920d9571c15e66 , < f0aad157576da199c146c1bb266442befa7912ca (git)
Affected: 849b0156d9960da628a06756bb920d9571c15e66 , < 7ee43ec8e6774774abbe9dc3027225e01bc964a5 (git)
Affected: 849b0156d9960da628a06756bb920d9571c15e66 , < e31408734332b8cc611342cdaaab6ba492180156 (git)
Affected: bc8a32726774286325b0cb0daab55b682cafc1ef (git)
Affected: 5.15.216 , < 5.16 (semver)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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      "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-\u003elock 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-\u003elock again.  That gives the unregister\npaths the lock ordering occ-\u003elock -\u003e sysfs callback drain, while a callback\nhas the opposite edge sysfs callback -\u003e occ-\u003elock.\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  ... (\u0026test_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-\u003ehwmon and update occ-\u003eactive while occ-\u003elock\nis held so concurrent OCC state changes still see a stable state, then\ndrop occ-\u003elock before calling hwmon_device_unregister().  Remove the\ndriver sysfs group before taking occ-\u003elock 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:49:04.992Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/2a4c80ff3571498ec6a916273304b6650026b1b0"
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        },
        {
          "url": "https://git.kernel.org/stable/c/e31408734332b8cc611342cdaaab6ba492180156"
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      ],
      "title": "hwmon: (occ) unregister sysfs devices outside occ lock",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80660",
    "datePublished": "2026-08-28T06:49:04.992Z",
    "dateReserved": "2026-08-26T14:34:25.780Z",
    "dateUpdated": "2026-08-28T06:49:04.992Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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    "epss": {
      "cve": "CVE-2026-80660",
      "date": "2026-09-01",
      "epss": "0.00172",
      "percentile": "0.06783"
    },
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That gives the unregister\\npaths the lock ordering occ-\u003elock -\u003e sysfs callback drain, while a callback\\nhas the opposite edge sysfs callback -\u003e occ-\u003elock.\\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  ... (\u0026test_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-\u003ehwmon and update occ-\u003eactive while occ-\u003elock\\nis held so concurrent OCC state changes still see a stable state, then\\ndrop occ-\u003elock before calling hwmon_device_unregister().  Remove the\\ndriver sysfs group before taking occ-\u003elock 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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/hwmon/occ/common.c\",\"drivers/hwmon/occ/common.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/hwmon/occ/common.c\",\"drivers/hwmon/occ/common.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"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\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T16:11:44+00:00",
      "cve": "CVE-2026-80660",
      "id": "CVE-2026-80660",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hwmon: (occ) unregister sysfs devices outside occ lock",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80660.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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Detection rules are retrieved from Rulezet.