{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89972",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89972"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "nvme: add missing SRCU grace period in error path",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme: add missing SRCU grace period in error path\n\nnvme_alloc_ns() error path at out_unlink_ns removes ns from the\nnamespace head siblings list with list_del_rcu(&ns->siblings) but\ndoes not wait for SRCU readers before freeing the namespace struct.\nMultipath code iterates the head->list under srcu_read_lock() in\nnvme_find_path() and nvme_mpath_revalidate_paths(), so a concurrent\nreader can still hold a reference to ns when kfree(ns) runs.\n\nThe normal removal path in nvme_ns_remove() correctly calls\nsynchronize_srcu(&ns->head->srcu) after list_del_rcu() to wait for\nin-progress readers. Add the same grace period in the error path.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89972"
    },
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      "scenario": "AV:N - NVMe host core scans namespaces from NVMe-oF (nvme-tcp/rdma/fc) when a remote target sends NS_CHANGED AENs or Identify data; a malicious or compromised fabric target drives nvme_scan_ns\u2192nvme_alloc_ns and the out_unlink_ns UAF over the network (typically TCP 4420).\nAC:L - The remote target controls both sides of the race: it can stall then fail Identify after list_add_tail_rcu so the new path is on head->list, while concurrent multipath I/O or ANA AENs walk that list under srcu_read_lock in nvme_find_path/nvme_mpath_revalidate_paths; CONFIG_NVME_MULTIPATH is the recommended default.\nPR:N - The attacker is the NVMe-oF peer and needs no host account or capability; NVMe/TCP is unauthenticated by default (TLS and DH-HMAC-CHAP are optional), and AENs plus Identify responses are accepted on an already-established fabrics session.\nUI:N - NVMe-oF controllers are persistent boot/autoconnect configuration; namespace rescans, ANA updates, and multipath I/O run from kernel workqueues and the block layer with no further victim action at exploit time.\nS:U - The use-after-free corrupts kernel heap (struct nvme_ns) inside the host NVMe driver and does not cross a VM, IOMMU, or other distinct security authority.\nC:H - Use-after-free of the namespace object on the multipath siblings list lets an attacker reclaim the kmalloc slab and obtain a kernel read primitive from stale ns->disk/ctrl/flags dereferences in nvme_find_path.\nI:H - The same UAF is heap-sprayable: multipath I/O and ioctl paths dereference fields of the freed nvme_ns, enabling arbitrary write and control-flow hijacking in kernel context.\nA:H - Any use-after-free of ns during the SRCU list walk can oops or panic the host kernel even without a full exploit, taking down the NVMe storage stack."
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}