{"metadata": {"vulnerability": "CVE-2026-99256", "count": 20, "kinds": {"milestone": 7, "sighting": 1, "kev": 0, "other": 12}}, "data": [{"timestamp": "2026-09-25T10:25:14.404Z", "date_only": false, "value": "2026-09-25T10:25:14.404Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-99256", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-11-03T11:25:14.077Z", "date_only": false, "value": "2026-11-03T11:25:14.077Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-99256", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-11-03T11:30:08.217Z", "date_only": false, "value": "2026-11-03T11:30:08.217716Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117552277603157246", "record": "CVE-2026-99256", "field": "creation_timestamp", "uuid": "e1f9c3a8-9a30-499b-83d2-22f18415d342", "content": "CVE-2026-99256 dm cache: fix issue with background work locking In the Linux kernel, the following vulnerability has been resolved:\ndm cache: fix issue with background work locking\ndm cache used a rw_semaphore for background_work_lock. Write locks onrw_semaphores have strict owner semantics, but there was no guaranteethat the process that locked background_work_lock was the same processthat unlocked it. This can be easily seen using a kernel compiled withCONFIG_DEBUG_RWSEMS. Given a dm cache device <cache>, run: 'dmsetupsuspend <cache> && dmsetup resume <cache>'. This will trigger a kernelwarning:\nDEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE))\ntriggered by cache_resume(). To fix this, switch from a rw_semaphore toa spinlock and a wait queue. dm cache already has a wait queue andassociated counter, migration_wait and nr_allocated_migrations, that wasgetting woken up when background work was getting completed, but wasn'tactually used by anything. This is replaced by the background_work queueand counter.\nhttps://www.cve.org/CVERecord?id=CVE-2026-99256https://git.kernel.org/stable/c/0c7a8cad7c96012a9157a189649e569d0390f384https://git.kernel.org/stable/c/f5db935d257023c3ef410bd39163b949b0e5a55dhttps://git.kernel.org/stable/c/6290507ecc0dd6dd40759729cbbbd49b1d2a63c4https://git.kernel.org/stable/c/8433fd005c25fd127021f67c9144a879fb585572https://git.kernel.org/stable/c/2f2cfa16dd0f4179bb988139dd37d00a42324f6chttps://git.kernel.org/stable/c/73df2ff409f3db95029982fe3656329568e3715dhttps://git.kernel.org/stable/c/104f09e02038b0fc6bbb718b3976af029e15c1d0https://git.kernel.org/stable/c/bc9781c0247de107876f32929f1637db93a42b34#kernel #Linux#CVE_2026_99256#bot", "url": "https://infosec.exchange/users/cve/statuses/117552277603157246"}, {"timestamp": "2026-11-03T11:40:45.109Z", "date_only": false, "value": "2026-11-03T11:40:45.109Z", "kind": "other", "label": "Updated", "source": "cvelistv5", "record": "CVE-2026-99256", "field": "cveMetadata.dateUpdated"}, {"timestamp": "2026-11-03T11:40:45.109Z", "date_only": false, "value": "2026-11-03T11:40:45.109Z", "kind": "other", "label": "Updated", "source": "cvelistv5 / Linux", "record": "CVE-2026-99256", "field": "containers.cna.providerMetadata.dateUpdated"}, {"timestamp": "2026-11-03T12:17:00Z", "date_only": false, "value": "2026-11-03T12:17:00Z", "kind": "milestone", "label": "Published", "source": "osv_ubuntu \u00b7 UBUNTU-CVE-2026-99256", "record": "UBUNTU-CVE-2026-99256", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-11-03T12:17:32Z", "date_only": false, "value": "2026-11-03T12:17:32Z", "kind": "other", "label": "Nvd published at", "source": "github \u00b7 GHSA-PR5P-X5RG-2942", "record": "GHSA-PR5P-X5RG-2942", "field": "database_specific.nvd_published_at", "linked_record": true}, {"timestamp": "2026-11-03T12:17:32.437Z", "date_only": false, "value": "2026-11-03T12:17:32.437", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-99256", "record": "FKIE_CVE-2026-99256", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-11-03T12:17:32.437Z", "date_only": false, "value": "2026-11-03T12:17:32.437", "kind": "other", "label": "Updated", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-99256", "record": "FKIE_CVE-2026-99256", "field": "lastModified", "linked_record": true}, {"timestamp": "2026-11-03T12:31:50Z", "date_only": false, "value": "2026-11-03T12:31:50Z", "kind": "milestone", "label": "Published", "source": "github \u00b7 GHSA-PR5P-X5RG-2942", "record": "GHSA-PR5P-X5RG-2942", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-11-03T12:31:50Z", "date_only": false, "value": "2026-11-03T12:31:50Z", "kind": "other", "label": "Updated", "source": "github \u00b7 GHSA-PR5P-X5RG-2942", "record": "GHSA-PR5P-X5RG-2942", "field": "modified", "linked_record": true}, {"timestamp": "2026-11-04T01:03:24Z", "date_only": false, "value": "2026-11-04T01:03:24.000Z", "kind": "other", "label": "Advisory revision", "source": "csaf_microsoft \u00b7 MSRC_CVE-2026-99256", "record": "MSRC_CVE-2026-99256", "field": "document.tracking.revision_history.0.date", "linked_record": true}, {"timestamp": "2026-11-04T01:03:24Z", "date_only": false, "value": "2026-11-04T01:03:24.000Z", "kind": "other", "label": "None available", "source": "csaf_microsoft \u00b7 MSRC_CVE-2026-99256", "record": "MSRC_CVE-2026-99256", "field": "vulnerabilities.0.remediations.0.date", "linked_record": true}, {"timestamp": "2026-11-04T01:03:24Z", "date_only": false, "value": "2026-11-04T01:03:24.000Z", "kind": "milestone", "label": "Published", "source": "csaf_microsoft \u00b7 MSRC_CVE-2026-99256", "record": "MSRC_CVE-2026-99256", "field": "document.tracking.initial_release_date", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-11-04T14:46:47Z", "date_only": false, "value": "2026-11-04T14:46:47.000Z", "kind": "other", "label": "Advisory revision", "source": "csaf_microsoft \u00b7 MSRC_CVE-2026-99256", "record": "MSRC_CVE-2026-99256", "field": "document.tracking.revision_history.1.date", "linked_record": true}, {"timestamp": "2026-11-04T14:46:47Z", "date_only": false, "value": "2026-11-04T14:46:47.000Z", "kind": "other", "label": "Updated", "source": "csaf_microsoft \u00b7 MSRC_CVE-2026-99256", "record": "MSRC_CVE-2026-99256", "field": "document.tracking.current_release_date", "linked_record": true}, {"timestamp": "2026-11-05T04:42:29Z", "date_only": false, "value": "2026-11-05T04:42:29Z", "kind": "other", "label": "Updated", "source": "osv_ubuntu \u00b7 UBUNTU-CVE-2026-99256", "record": "UBUNTU-CVE-2026-99256", "field": "modified", "linked_record": true}, {"timestamp": "2026-11-05T06:08:03.768Z", "date_only": false, "value": "2026-11-05T06:08:03.768209Z", "kind": "milestone", "label": "Published", "source": "osv_bellsoft \u00b7 BELL-CVE-2026-99256", "record": "BELL-CVE-2026-99256", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-11-05T06:30:22.873Z", "date_only": false, "value": "2026-11-05T06:30:22.873177Z", "kind": "other", "label": "Updated", "source": "osv_bellsoft \u00b7 BELL-CVE-2026-99256", "record": "BELL-CVE-2026-99256", "field": "modified", "linked_record": true}, {"timestamp": "2026-11-05T08:00:26.621Z", "date_only": false, "value": "2026-11-05T08:00:26.621Z", "kind": "other", "label": "Document generated", "source": "csaf_microsoft \u00b7 MSRC_CVE-2026-99256", "record": "MSRC_CVE-2026-99256", "field": "document.tracking.generator.date", "linked_record": true}], "metrics": {"as_of": "2026-11-05T23:49:53.966Z", "anchors": {"origin": {"timestamp": "2026-11-03T11:25:14.077Z", "date_only": false, "value": "2026-11-03T11:25:14.077Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-99256", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "discovery": null, "report": null, "acknowledgement": null, "disclosure": {"timestamp": "2026-11-03T11:25:14.077Z", "date_only": false, "value": "2026-11-03T11:25:14.077Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-99256", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "exploit_publication": null, "exploitation": null, "patch": null}, "vendor_response_time": {"available": false, "missing": ["start", "end"]}, "time_to_exploit": {"available": false, "missing": ["end"]}, "disclosure_to_exploit": {"available": false, "missing": ["end"]}, "disclosure_to_exploit_publication": {"available": false, "missing": ["end"]}, "time_to_patch": {"available": false, "missing": ["start", "end"]}, "total_time_to_patch": {"available": false, "missing": ["start", "end"]}, "disclosure_to_patch": {"available": false, "missing": ["end"]}, "time_unpatched": {"available": true, "seconds": 217479.889001, "hours": 60.41108027805556, "days": 2.5171283449189814, "min_seconds": 217479.889001, "max_seconds": 217479.889001, "approximate": false, "ongoing": true, "order_known": true, "batch_listing": false, "end_before_start": false, "start": {"timestamp": "2026-11-03T11:25:14.077Z", "date_only": false, "value": "2026-11-03T11:25:14.077Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-99256", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, "end": {"timestamp": "2026-11-05T23:49:53.966Z", "date_only": false, "label": "As of", "source": "Calculation clock"}}, "exploitation_to_patch": {"available": false, "missing": ["start"]}, "exploit_publication_to_patch": {"available": false, "missing": ["start"]}}}