{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80660", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.780Z", "datePublished": "2026-08-28T06:49:04.992Z", "dateUpdated": "2026-08-28T06:49:04.992Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-28T06:49:04.992Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hwmon/occ/common.c", "drivers/hwmon/occ/common.h"], "versions": [{"version": "849b0156d9960da628a06756bb920d9571c15e66", "lessThan": "2a4c80ff3571498ec6a916273304b6650026b1b0", "status": "affected", "versionType": "git"}, {"version": "849b0156d9960da628a06756bb920d9571c15e66", "lessThan": "e7fd81e9fb1fe476d2131fec66c1138457810ed4", "status": "affected", "versionType": "git"}, {"version": "849b0156d9960da628a06756bb920d9571c15e66", "lessThan": "2092952f22a7da98e76e84139ae202b1fc7ba899", "status": "affected", "versionType": "git"}, {"version": "849b0156d9960da628a06756bb920d9571c15e66", "lessThan": "f0aad157576da199c146c1bb266442befa7912ca", "status": "affected", "versionType": "git"}, {"version": "849b0156d9960da628a06756bb920d9571c15e66", "lessThan": "7ee43ec8e6774774abbe9dc3027225e01bc964a5", "status": "affected", "versionType": "git"}, {"version": "849b0156d9960da628a06756bb920d9571c15e66", "lessThan": "e31408734332b8cc611342cdaaab6ba492180156", "status": "affected", "versionType": "git"}, {"version": "bc8a32726774286325b0cb0daab55b682cafc1ef", "status": "affected", "versionType": "git"}, {"version": "5.15.216", "lessThan": "5.16", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hwmon/occ/common.c", "drivers/hwmon/occ/common.h"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.216"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-80660", "lastModified": "2026-08-28T08:16:51.160", "metrics": {}, "published": "2026-08-28T08:16:51.160", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: hwmon: (occ) unregister sysfs devices outside occ lock", "id": "2525488", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525488"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-833", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nhwmon: (occ) unregister sysfs devices outside occ lock\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.\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\nThe grounded PoC kept the real unregister and callback carrier:\nocc_shutdown()\nhwmon_device_unregister()\nocc_show_temp_1()\nocc_update_response()\nLockdep reported the circular dependency with occ_shutdown() already\nholding the OCC mutex and hwmon_device_unregister() waiting on the sysfs\nside:\nWARNING: 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]\nocc_update_response.isra.0+0xb/0x20 [vuln_msv]\nocc_show_temp_1.constprop.0.isra.0+0x23/0x40 [vuln_msv]\n*** DEADLOCK ***\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.", "A flaw was found in the Linux kernel's hwmon (occ) component. This vulnerability occurs when `occ_active(false)` or `occ_shutdown()` attempt to unregister sysfs devices while holding the `occ->lock`. During this process, sysfs callbacks can re-enter the OCC update path and try to acquire the `occ->lock` again, creating a circular locking dependency. This can lead to a deadlock, causing a Denial of Service (DoS) where the system becomes unresponsive."], "name": "CVE-2026-80660", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80660\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80660\nhttps://lore.kernel.org/linux-cve-announce/2026082845-CVE-2026-80660-d193@gregkh/T"], "threat_severity": "Moderate"}