{ "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" } } } }