{"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"}}}}