{"metadata": {"vulnerability": "CVE-2026-98990", "count": 44, "kinds": {"milestone": 11, "sighting": 1, "kev": 0, "other": 32}, "linked_omitted": 0}, "data": [{"timestamp": "2026-09-25T10:25:14.384Z", "date_only": false, "value": "2026-09-25T10:25:14.384Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-98990", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-10-23T12:20:09.349Z", "date_only": false, "value": "2026-10-23T12:20:09.349Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-98990", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-23T13:17:00Z", "date_only": false, "value": "2026-10-23T13:17:00Z", "kind": "milestone", "label": "Published", "source": "osv_ubuntu \u00b7 UBUNTU-CVE-2026-98990", "record": "UBUNTU-CVE-2026-98990", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-23T13:17:20Z", "date_only": false, "value": "2026-10-23T13:17:20Z", "kind": "other", "label": "Nvd published at", "source": "github \u00b7 GHSA-5V88-6PXR-8V5G", "record": "GHSA-5V88-6PXR-8V5G", "field": "database_specific.nvd_published_at", "linked_record": true}, {"timestamp": "2026-10-23T13:17:20.980Z", "date_only": false, "value": "2026-10-23T13:17:20.980", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-98990", "record": "FKIE_CVE-2026-98990", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-23T13:33:25.922Z", "date_only": false, "value": "2026-10-23T13:33:25.922545Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117490476997563131", "record": "CVE-2026-98990", "field": "creation_timestamp", "uuid": "f224b82b-199e-4bab-8b2d-b643cea687de", "content": "CVE-2026-98990 namespace: check a submount for references right before unmounting it In the Linux kernel, the following vulnerability has been resolved:\nnamespace: check a submount for references right before unmounting it\nshrink_submounts() and mark_mounts_for_expiry() first collect all themounts they are allowed to unmount and then unmount them.\nWhether a mount is busy is decided by propagate_mount_busy() on thetree. But unmounting the first mount changes the tree that the secondone propagates into. propagate_umount()moves a surviving overmount off a copy it unmounts and mounts it wherethe copy was mounted. If that's where the propagated copy of the secondvictim is looked up the overmount becomes a candidate of the secondumount_tree(). It's childless and so trim_one() commits it withoutlooking at its reference count.\nSo a synchronous umount pulls out a busy mount that is in use somewhereelse and marks it MNT_SYNC_UMOUNT while it has users:\n  umount2(/tmp/plshrink/p1, 0) = 0 errno 0  cwd is (unreachable)\nThe same two umounts requested one after the other fail with EBUSY.This needs a mount with MNT_SHRINKABLE, i.e., automounted submounts ofNFS, AFS and CIFS or the tracefs mount below debugfs. Bind mountsinherit the flag.\nCheck each mount right before it is unmounted under the same hold ofnamespace_sem and mount_lock as the umount itself. Make sure that thealgorithm stays linear.\nhttps://www.cve.org/CVERecord?id=CVE-2026-98990https://git.kernel.org/stable/c/f6394281834492c6516a405a348b545ae698a331https://git.kernel.org/stable/c/6e4012e571867868b545c91ca9d6095fdb709907https://git.kernel.org/stable/c/d73f04e92c1aab78d96ac6cadb234c8a3a373d22https://git.kernel.org/stable/c/18902a23ef36f83d32bafc58ae2484e6bb4bb8efhttps://git.kernel.org/stable/c/32bf92416614a1e3ff3524fc6b780259c7aad3ef#kernel #Linux#CVE_2026_98990#bot", "url": "https://infosec.exchange/users/cve/statuses/117490476997563131"}, {"timestamp": "2026-10-23T15:31:34Z", "date_only": false, "value": "2026-10-23T15:31:34Z", "kind": "milestone", "label": "Published", "source": "github \u00b7 GHSA-5V88-6PXR-8V5G", "record": "GHSA-5V88-6PXR-8V5G", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-25T01:02:56Z", "date_only": false, "value": "2026-10-25T01:02:56.000Z", "kind": "other", 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