{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "849b0156d9960da628a06756bb920d9571c15e66"
            },
            {
              "fixed": "2a4c80ff3571498ec6a916273304b6650026b1b0"
            },
            {
              "fixed": "e7fd81e9fb1fe476d2131fec66c1138457810ed4"
            },
            {
              "fixed": "2092952f22a7da98e76e84139ae202b1fc7ba899"
            },
            {
              "fixed": "f0aad157576da199c146c1bb266442befa7912ca"
            },
            {
              "fixed": "7ee43ec8e6774774abbe9dc3027225e01bc964a5"
            },
            {
              "fixed": "e31408734332b8cc611342cdaaab6ba492180156"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "bc8a32726774286325b0cb0daab55b682cafc1ef"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.15.216"
            },
            {
              "fixed": "5.16"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.19.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80660.json"
  },
  "details": "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.",
  "id": "CVE-2026-80660",
  "modified": "2026-08-30T03:30:49.039238234Z",
  "published": "2026-08-28T06:49:04.992Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2092952f22a7da98e76e84139ae202b1fc7ba899"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a4c80ff3571498ec6a916273304b6650026b1b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ee43ec8e6774774abbe9dc3027225e01bc964a5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e31408734332b8cc611342cdaaab6ba492180156"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7fd81e9fb1fe476d2131fec66c1138457810ed4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0aad157576da199c146c1bb266442befa7912ca"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80660.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80660"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "hwmon: (occ) unregister sysfs devices outside occ lock"
}