{"metadata": {"vulnerability": "CVE-2026-99258", "count": 14, "kinds": {"milestone": 6, "sighting": 1, "kev": 0, "other": 7}}, "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-2026-99258", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-11-03T11:25:14.680Z", "date_only": false, "value": "2026-11-03T11:25:14.680Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-99258", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-11-03T11:31:28.760Z", "date_only": false, "value": "2026-11-03T11:31:28.760661Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117552282878101477", "record": "CVE-2026-99258", "field": "creation_timestamp", "uuid": "058b844f-14d4-4304-82fb-ed401157e6b3", "content": "CVE-2026-99258 x86/hyperv: Avoid using per-cpu output page in hv_apicid_to_vp_index() In the Linux kernel, the following vulnerability has been resolved:\nx86/hyperv: Avoid using per-cpu output page in hv_apicid_to_vp_index()\nhv_apicid_to_vp_index() currently uses the per-cpu hypercall inputand output pages. This function is called when running in VTL2 andwhen running in an SEV-SNP CoCo VM with no paravisor. In the formercase, the output page is allocated, but in the latter case it isnot, so the hypervisor stores the output VP index in memory that hasnot been allocated by the guest.\nFix this by using the input page for both input and output. Thehypercall has very small input and output, so sharing the samepage for both is straightforward. An alternative fix is toallocate the per-cpu output page when running in an SEV-SNP CoCoguest, but this uses significantly more memory, particularlywith larger vCPUs counts.\nhttps://www.cve.org/CVERecord?id=CVE-2026-99258https://git.kernel.org/stable/c/bdba5f1b8bd0d18b1df61f769b559ed272902489https://git.kernel.org/stable/c/2b561786c9076a892ef8b8f416c9828bc87ed44fhttps://git.kernel.org/stable/c/bc8ca0f4769627ae7d04e7ffdbd20de4f27a9bf9https://git.kernel.org/stable/c/7b74c117e2aac78e0f723e1c9c3644451c56b0d9#kernel #Linux#CVE_2026_99258#bot", "url": "https://infosec.exchange/users/cve/statuses/117552282878101477"}, {"timestamp": "2026-11-03T11:40:46.409Z", "date_only": false, "value": "2026-11-03T11:40:46.409Z", "kind": "other", "label": "Updated", "source": "cvelistv5", "record": "CVE-2026-99258", "field": "cveMetadata.dateUpdated"}, {"timestamp": "2026-11-03T11:40:46.409Z", "date_only": false, "value": "2026-11-03T11:40:46.409Z", "kind": "other", "label": "Updated", "source": "cvelistv5 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