bpf: return VMA snapshot from task_vma iterator

{
  "id": "6975c0f5c9b3a3462b1e4e616065db89858e8afe7c5298aac56e8cb7b0c4ddfb",
  "url": "https://osv.dev/vulnerability/CVE-2026-53084",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: return VMA snapshot from task_vma iterator",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: return VMA snapshot from task_vma iterator Holding the per-VMA lock across the BPF program body creates a lock ordering problem when helpers acquire locks that depend on mmap_lock: vm_lock -> i_rwsem -> mmap_lock -> vm_lock Snapshot the VMA under the per-VMA lock in _next() via memcpy(), then drop the lock before returning. The BPF program accesses only the snapshot. The verifier only trusts vm_mm and vm_file pointers (see BTF_TYPE_SAFE_TRUSTED_OR_NULL in verifier.c). vm_file is reference- counted with get_file() under the lock and released via fput() on the next iteration or in _destroy(). vm_mm is already correct because lock_vma_under_rcu() verifies vma->vm_mm == mm. All other pointers are left as-is by memcpy() since the verifier treats them as untrusted.",
    "evidence": "osv:CVE-2026-53084",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.91",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53084",
      "aliases": [
        "CVE-2026-53084"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4ac4546821584736798aaa9e97da9f6eaf689ea3"
                },
                {
                  "fixed": "83b8802c034e843b83a3e1ef6f30cdd4e9ec291c"
                },
                {
                  "fixed": "592226d138378601ae28eb890e2bbc23ec3600f7"
                },
                {
                  "fixed": "13860ca37b8df0b856ee1ce3bdbd7c327d5f53e8"
                },
                {
                  "fixed": "4cbee026db54cad39c39db4d356100cb133412b3"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53084.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.91"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.33"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53084.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.938945043Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/13860ca37b8df0b856ee1ce3bdbd7c327d5f53e8",
        "https://git.kernel.org/stable/c/4cbee026db54cad39c39db4d356100cb133412b3",
        "https://git.kernel.org/stable/c/592226d138378601ae28eb890e2bbc23ec3600f7",
        "https://git.kernel.org/stable/c/83b8802c034e843b83a3e1ef6f30cdd4e9ec291c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53084.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53084",
        "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/2026/53xxx/CVE-2026-53084.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53084",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 495537,
  "published_at": "2026-06-24T16:30:24.356+00:00"
}