{"metadata": {"vulnerability": "CVE-2026-98991", "count": 30, "kinds": {"milestone": 8, "sighting": 1, "kev": 0, "other": 21}, "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-2026-98991", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-10-23T12:20:10.289Z", "date_only": false, "value": "2026-10-23T12:20:10.289Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-98991", "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-2026-98991", "record": "UBUNTU-CVE-2026-98991", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-23T13:17:21Z", "date_only": false, "value": "2026-10-23T13:17:21Z", "kind": "other", "label": "Nvd published at", "source": "github \u00b7 GHSA-4QHH-MF87-XRFM", "record": "GHSA-4QHH-MF87-XRFM", "field": "database_specific.nvd_published_at", "linked_record": true}, {"timestamp": "2026-10-23T13:17:21.137Z", "date_only": false, "value": "2026-10-23T13:17:21.137", "kind": "milestone", "label": "Published", "source": "fkie_nvd \u00b7 FKIE_CVE-2026-98991", "record": "FKIE_CVE-2026-98991", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-23T13:34:06.350Z", "date_only": false, "value": "2026-10-23T13:34:06.350732Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117490479640644941", "record": "CVE-2026-98991", "field": "creation_timestamp", "uuid": "d32a2f4c-3327-48f8-bfab-25d9e3db4e3d", "content": "CVE-2026-98991 namespace: queue a mount only once for mount notifications In the Linux kernel, the following vulnerability has been resolved:\nnamespace: queue a mount only once for mount notifications\nmnt_notify_add() puts a mount on notify_list. It doesn't check whetherthe mount is on the list already. That's fine as long as every mount isqueued at most once per namespace_sem hold. It isn't.\npropagate_umount() moves a surviving overmount off a stack of mountsthat are going away and queues it as moved. shrink_submounts() andmark_mounts_for_expiry() call umount_tree() for several mounts under asingle namespace_sem hold. So the second umount_tree() can take downexactly the mount the first one reparented, reparent it once more and soend up queueing it a second time.\nThe second list_add_tail() cuts the mounts queued in between out of thelist while the head still points at the last of them. notify_mnt_list()then only visits that one mount and the others are freed after the graceperiod with notify_list still pointing at them. Every later mountoperation on the host walks freed memory:\n  BUG: KASAN: slab-use-after-free in __list_add_valid_or_report  Read of size 8 at addr ffff8881003d57e0 by task notify_dq/162   __list_add_valid_or_report+0x15c/0x1a0   mnt_add_to_ns+0x322/0x890   attach_recursive_mnt.isra.0+0xf2a/0x1a00   path_mount+0x139c/0x1d40\nThis needs a mount with MNT_SHRINKABLE to bind from. That's whatfinish_automount() creates (submounts of NFS, AFS and CIFS and thetracefs mount below debugfs). Bind mounts inherit the flag. A mountnamespace with a FAN_MARK_MNTNS mark does the rest and root in a usernamespace can have both.\nInitialize to_notify in alloc_vfsmnt() and leave a mount alone that isqueued already. mnt_notify() looks at the state the mount has when thelist is drained so a single entry per mount is enough. The move eventfor a mount that is unmounted under the same hold is lost. That's fine.The detach is what matters.\nhttps://www.cve.org/CVERecord?id=CVE-2026-98991https://git.kernel.org/stable/c/acbe9e4418e2ef7bef1a12e62e0e7d6145a15190https://git.kernel.org/stable/c/702ff3fe499876e09c45558a05366d21a5bc41abhttps://git.kernel.org/stable/c/bd2feb7796b6585938a4241e7b7c4148a6f7b762#kernel #Linux#CVE_2026_98991#bot", "url": "https://infosec.exchange/users/cve/statuses/117490479640644941"}, {"timestamp": "2026-10-23T15:31:34Z", "date_only": false, "value": "2026-10-23T15:31:34Z", "kind": "milestone", "label": "Published", "source": "github \u00b7 GHSA-4QHH-MF87-XRFM", "record": "GHSA-4QHH-MF87-XRFM", "field": "published", "metric_role": "disclosure", "metric_basis": "recorded_event", "linked_record": true}, {"timestamp": "2026-10-24T14:09:52.901Z", "date_only": false, "value": "2026-10-24T14:09:52.901Z", "kind": "other", "label": "Updated", "source": "cvelistv5", "record": "CVE-2026-98991", "field": "cveMetadata.dateUpdated"}, {"timestamp": 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