{"api_version":"1","generated_at":"2026-08-28T14:29:39+00:00","cve":"CVE-2026-80660","urls":{"html":"https://cve.report/CVE-2026-80660","api":"https://cve.report/api/cve/CVE-2026-80660.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80660","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80660"},"summary":{"title":"hwmon: (occ) unregister sysfs devices outside occ lock","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:51","updated_at":"2026-08-28 08:16:51"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/e31408734332b8cc611342cdaaab6ba492180156","name":"https://git.kernel.org/stable/c/e31408734332b8cc611342cdaaab6ba492180156","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f0aad157576da199c146c1bb266442befa7912ca","name":"https://git.kernel.org/stable/c/f0aad157576da199c146c1bb266442befa7912ca","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7ee43ec8e6774774abbe9dc3027225e01bc964a5","name":"https://git.kernel.org/stable/c/7ee43ec8e6774774abbe9dc3027225e01bc964a5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2a4c80ff3571498ec6a916273304b6650026b1b0","name":"https://git.kernel.org/stable/c/2a4c80ff3571498ec6a916273304b6650026b1b0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e7fd81e9fb1fe476d2131fec66c1138457810ed4","name":"https://git.kernel.org/stable/c/e7fd81e9fb1fe476d2131fec66c1138457810ed4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2092952f22a7da98e76e84139ae202b1fc7ba899","name":"https://git.kernel.org/stable/c/2092952f22a7da98e76e84139ae202b1fc7ba899","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80660","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80660","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 849b0156d9960da628a06756bb920d9571c15e66 2a4c80ff3571498ec6a916273304b6650026b1b0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 849b0156d9960da628a06756bb920d9571c15e66 e7fd81e9fb1fe476d2131fec66c1138457810ed4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 849b0156d9960da628a06756bb920d9571c15e66 2092952f22a7da98e76e84139ae202b1fc7ba899 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 849b0156d9960da628a06756bb920d9571c15e66 f0aad157576da199c146c1bb266442befa7912ca git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 849b0156d9960da628a06756bb920d9571c15e66 7ee43ec8e6774774abbe9dc3027225e01bc964a5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 849b0156d9960da628a06756bb920d9571c15e66 e31408734332b8cc611342cdaaab6ba492180156 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bc8a32726774286325b0cb0daab55b682cafc1ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.216 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/hwmon/occ/common.c","drivers/hwmon/occ/common.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2a4c80ff3571498ec6a916273304b6650026b1b0","status":"affected","version":"849b0156d9960da628a06756bb920d9571c15e66","versionType":"git"},{"lessThan":"e7fd81e9fb1fe476d2131fec66c1138457810ed4","status":"affected","version":"849b0156d9960da628a06756bb920d9571c15e66","versionType":"git"},{"lessThan":"2092952f22a7da98e76e84139ae202b1fc7ba899","status":"affected","version":"849b0156d9960da628a06756bb920d9571c15e66","versionType":"git"},{"lessThan":"f0aad157576da199c146c1bb266442befa7912ca","status":"affected","version":"849b0156d9960da628a06756bb920d9571c15e66","versionType":"git"},{"lessThan":"7ee43ec8e6774774abbe9dc3027225e01bc964a5","status":"affected","version":"849b0156d9960da628a06756bb920d9571c15e66","versionType":"git"},{"lessThan":"e31408734332b8cc611342cdaaab6ba492180156","status":"affected","version":"849b0156d9960da628a06756bb920d9571c15e66","versionType":"git"},{"status":"affected","version":"bc8a32726774286325b0cb0daab55b682cafc1ef","versionType":"git"},{"lessThan":"5.16","status":"affected","version":"5.15.216","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/hwmon/occ/common.c","drivers/hwmon/occ/common.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.19"},{"lessThan":"5.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"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":"6.1.178","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.216","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-08-28T06:49:04.992Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2a4c80ff3571498ec6a916273304b6650026b1b0"},{"url":"https://git.kernel.org/stable/c/e7fd81e9fb1fe476d2131fec66c1138457810ed4"},{"url":"https://git.kernel.org/stable/c/2092952f22a7da98e76e84139ae202b1fc7ba899"},{"url":"https://git.kernel.org/stable/c/f0aad157576da199c146c1bb266442befa7912ca"},{"url":"https://git.kernel.org/stable/c/7ee43ec8e6774774abbe9dc3027225e01bc964a5"},{"url":"https://git.kernel.org/stable/c/e31408734332b8cc611342cdaaab6ba492180156"}],"title":"hwmon: (occ) unregister sysfs devices outside occ lock","x_generator":{"engine":"bippy-1.2.0"}}},"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"},"nvd":{"publishedDate":"2026-08-28 08:16:51","lastModifiedDate":"2026-08-28 08:16:51","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80660","Ordinal":"1","Title":"hwmon: (occ) unregister sysfs devices outside occ lock","CVE":"CVE-2026-80660","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80660","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"hwmon: (occ) unregister sysfs devices outside occ lock"}]}}}