{"metadata": {"vulnerability": "cve-2025-21816", "count": 179, "kinds": {"milestone": 43, "sighting": 5, "kev": 0, "other": 131}}, "data": [{"timestamp": "2024-12-29T08:45:45.774Z", "date_only": false, "value": "2024-12-29T08:45:45.774Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "cve-2025-21816", "field": "cveMetadata.dateReserved"}, {"timestamp": "2025-02-27T20:04:15.356Z", "date_only": false, "value": "2025-02-27T20:04:15.356Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "cve-2025-21816", "field": "cveMetadata.datePublished"}, {"timestamp": "2025-02-27T20:16:00Z", "date_only": false, "value": "2025-02-27T20:16:00Z", "kind": "milestone", "label": "Published", "source": "osv_ubuntu \u00b7 UBUNTU-CVE-2025-21816", "record": "UBUNTU-CVE-2025-21816", "field": "published"}, {"timestamp": "2025-02-27T20:16:04Z", "date_only": false, "value": "2025-02-27T20:16:04Z", "kind": "other", "label": "Nvd published at", "source": "github \u00b7 GHSA-RP2M-6293-6R8V", "record": "GHSA-RP2M-6293-6R8V", "field": "database_specific.nvd_published_at"}, {"timestamp": "2025-02-27T20:16:04.150Z", "date_only": false, "value": "2025-02-27T20:16:04.150", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2025-21816", "record": "FKIE_CVE-2025-21816", "field": "published"}, {"timestamp": "2025-02-27T21:32:17Z", "date_only": false, "value": "2025-02-27T21:32:17Z", "kind": "milestone", "label": "Published", "source": "github \u00b7 GHSA-RP2M-6293-6R8V", "record": "GHSA-RP2M-6293-6R8V", "field": "published"}, {"timestamp": "2025-02-27T21:59:00.037Z", "date_only": false, "value": "2025-02-27T21:59:00.037070Z", "kind": "sighting", "label": "Seen", "source": "https://bsky.app/profile/cve.skyfleet.blue/post/3lj6v7z3vor2w", "record": "CVE-2025-21816", "field": "creation_timestamp", "uuid": "728c8518-4b0c-434c-b73e-1c329b8e9d2d", "url": "https://bsky.app/profile/cve.skyfleet.blue/post/3lj6v7z3vor2w"}, {"timestamp": "2025-02-27T23:00:00Z", "date_only": false, "value": "2025-02-27T23:00:00.000+00:00", "kind": "other", "label": "Advisory revision", "source": "csaf_certbund \u00b7 WID-SEC-W-2025-0461", "record": "WID-SEC-W-2025-0461", "field": "document.tracking.revision_history.0.date"}, {"timestamp": "2025-02-27T23:00:00Z", "date_only": false, "value": "2025-02-27T23:00:00.000+00:00", "kind": "milestone", "label": "Published", "source": "csaf_certbund \u00b7 WID-SEC-W-2025-0461", "record": "WID-SEC-W-2025-0461", "field": "document.tracking.initial_release_date"}, {"timestamp": "2025-02-27T23:00:00Z", "date_only": false, "value": "2025-02-27T23:00:00.000+00:00", "kind": "other", "label": "Release date", "source": "csaf_certbund \u00b7 WID-SEC-W-2025-0461", "record": "WID-SEC-W-2025-0461", "field": "vulnerabilities.0.release_date"}, {"timestamp": "2025-02-27T23:27:08Z", "date_only": false, "value": "2025-02-27T23:27:08.000000Z", "kind": "sighting", "label": "Seen", "source": "https://t.me/cvedetector/19090", "record": "CVE-2025-21816", "field": "creation_timestamp", "uuid": "39c8deef-9bdd-4e72-a2d8-3d4187b674bb", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2025-21816 - Linux Kernel Hrtimers CPU Hotplug Vulnerability\", \n  \"Content\": \"CVE ID : CVE-2025-21816 \nPublished : Feb. 27, 2025, 8:16 p.m. | 1\u00a0hour, 21\u00a0minutes ago \nDescription : In the Linux kernel, the following vulnerability has been resolved:  \n  \nhrtimers: Force migrate away hrtimers queued after CPUHP_AP_HRTIMERS_DYING  \n  \nhrtimers are migrated away from the dying CPU to any online target at  \nthe CPUHP_AP_HRTIMERS_DYING stage in order not to delay bandwidth timers  \nhandling tasks involved in the CPU hotplug forward progress.  \n  \nHowever wakeups can still be performed by the outgoing CPU after  \nCPUHP_AP_HRTIMERS_DYING. Those can result again in bandwidth timers being  \narmed. Depending on several considerations (crystal ball power management  \nbased election, earliest timer already enqueued, timer migration enabled or  \nnot), the target may eventually be the current CPU even if offline. If that  \nhappens, the timer is eventually ignored.  \n  \nThe most notable example is RCU which had to deal with each and every of  \nthose wake-ups by deferring them to an online CPU, along with related  \nworkarounds:  \n  \n_ e787644caf76 (rcu: Defer RCU kthreads wakeup when CPU is dying)  \n_ 9139f93209d1 (rcu/nocb: Fix RT throttling hrtimer armed from offline CPU)  \n_ f7345ccc62a4 (rcu/nocb: Fix rcuog wake-up from offline softirq)  \n  \nThe problem isn't confined to RCU though as the stop machine kthread  \n(which runs CPUHP_AP_HRTIMERS_DYING) reports its completion at the end  \nof its work through cpu_stop_signal_done() and performs a wake up that  \neventually arms the deadline server timer:  \n  \n   WARNING: CPU: 94 PID: 588 at kernel/time/hrtimer.c:1086 hrtimer_start_range_ns+0x289/0x2d0  \n   CPU: 94 UID: 0 PID: 588 Comm: migration/94 Not tainted  \n   Stopper: multi_cpu_stop+0x0/0x120 <-\nSeverity: 0.0 | NA \nVisit the link for more details, such as CVSS details, affected products, timeline, and more...\",\n  \"Detection Date\": \"27 Feb 2025\",\n  \"Type\": \"Vulnerability\"\n}\n\ud83d\udd39 t.me/cvedetector \ud83d\udd39", "url": "https://t.me/cvedetector/19090"}, {"timestamp": "2025-03-12T23:00:00Z", "date_only": false, "value": "2025-03-12T23:00:00.000+00:00", "kind": "other", "label": "Advisory revision", "source": "csaf_certbund \u00b7 WID-SEC-W-2025-0461", "record": "WID-SEC-W-2025-0461", "field": "document.tracking.revision_history.1.date"}, {"timestamp": "2025-03-13T23:00:00Z", "date_only": false, "value": "2025-03-13T23:00:00.000+00:00", "kind": "other", "label": "Advisory revision", "source": "csaf_certbund \u00b7 WID-SEC-W-2025-0461", "record": "WID-SEC-W-2025-0461", "field": "document.tracking.revision_history.2.date"}, {"timestamp": "2025-03-19T23:00:00Z", "date_only": false, "value": "2025-03-19T23:00:00.000+00:00", "kind": "other", "label": "Advisory revision", "source": "csaf_certbund \u00b7 WID-SEC-W-2025-0461", "record": 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