nvme: fix SRCU protection of nvme_ns_head list

{
  "id": "208f888216dc6f2cecb9bbfccc858847f4b8a6acda039b7f5c17f1d562d9def4",
  "url": "https://osv.dev/vulnerability/CVE-2022-49003",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "nvme: fix SRCU protection of nvme_ns_head list",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: nvme: fix SRCU protection of nvme_ns_head list Walking the nvme_ns_head siblings list is protected by the head's srcu in nvme_ns_head_submit_bio() but not nvme_mpath_revalidate_paths(). Removing namespaces from the list also fails to synchronize the srcu. Concurrent scan work can therefore cause use-after-frees. Hold the head's srcu lock in nvme_mpath_revalidate_paths() and synchronize with the srcu, not the global RCU, in nvme_ns_remove(). Observed the following panic when making NVMe/RDMA connections with native multipath on the Rocky Linux 8.6 kernel (it seems the upstream kernel has the same race condition). Disassembly shows the faulting instruction is cmp 0x50(%rdx),%rcx; computing capacity != get_capacity(ns->disk). Address 0x50 is dereferenced because ns->disk is NULL. The NULL disk appears to be the result of concurrent scan work freeing the namespace (note the log line in the middle of the panic). [37314.206036] BUG: unable to handle kernel NULL pointer dereference at 0000000000000050 [37314.206036] nvme0n3: detected capacity change from 0 to 11811160064 [37314.299753] PGD 0 P4D 0 [37314.299756] Oops: 0000 [#1] SMP PTI [37314.299759] CPU: 29 PID: 322046 Comm: kworker/u98:3 Kdump: loaded Tainted: G W X --------- - - 4.18.0-372.32.1.el8test86.x86_64 #1 [37314.299762] Hardware name: Dell Inc. PowerEdge R720/0JP31P, BIOS 2.7.0 05/23/2018 [37314.299763] Workqueue: nvme-wq nvme_scan_work [nvme_core] [3731",
    "evidence": "osv:CVE-2022-49003",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.82",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2022-49003",
      "aliases": [
        "CVE-2022-49003"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e7d65803e2bb5bc739548b67a5fc72c626cf7e3b"
                },
                {
                  "fixed": "787d81d4eb150e443e5d1276c6e8f03cfecc2302"
                },
                {
                  "fixed": "5b566d09ab1b975566a53f9c5466ee260d087582"
                },
                {
                  "fixed": "899d2a05dc14733cfba6224083c6b0dd5a738590"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49003.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "5.15.82"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.0.12"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49003.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.091881408Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5b566d09ab1b975566a53f9c5466ee260d087582",
        "https://git.kernel.org/stable/c/787d81d4eb150e443e5d1276c6e8f03cfecc2302",
        "https://git.kernel.org/stable/c/899d2a05dc14733cfba6224083c6b0dd5a738590",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49003.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49003",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49003.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49003",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498834,
  "published_at": "2024-10-21T20:06:16.737+00:00"
}