RDMA: During rereg_mr ensure that REREG_ACCESS is compatible

{
  "id": "27301cb838d5a6a49bcb189e45b5acc8c81e1b2065035599155a3aa278e1d4ea",
  "url": "https://osv.dev/vulnerability/CVE-2026-52908",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RDMA: During rereg_mr ensure that REREG_ACCESS is compatible",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: RDMA: During rereg_mr ensure that REREG_ACCESS is compatible If IB_MR_REREG_ACCESS changes from RO to RW then the umem has to be re-evaluated to ensure it is properly pinned as RW. Since the umem is hidden inside each driver's mr struct add a ib_umem_check_rereg() function that each driver has to call before processing IB_MR_REREG_ACCESS. mlx4 has to retain its duplicate ib_access_writable check because it implements IB_MR_REREG_ACCESS | IB_MR_REREG_TRANS by changing both items in place sequentially while the MR is live, so it will continue to not support this combination.",
    "evidence": "osv:CVE-2026-52908",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.143",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.94",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-52908",
      "aliases": [
        "CVE-2026-52908"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "09dc18894148381d3bfc550083b1236043870dce"
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                  "fixed": "badad6fad60def1b9805559dd81dbab3d97b82aa"
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52908.json"
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "6.2.0"
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                  "fixed": "6.6.143"
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            {
              "type": "ECOSYSTEM",
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                  "fixed": "6.18.36"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                  "fixed": "7.0.13"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52908.json"
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        }
      ],
      "modified": "2026-10-28T02:30:45.287695371Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/09dc18894148381d3bfc550083b1236043870dce",
        "https://git.kernel.org/stable/c/2904e985a2917b5dac65df82733065e78a65fc9d",
        "https://git.kernel.org/stable/c/50334a05a950840b39a1ce3d2a173b4183db9b3e",
        "https://git.kernel.org/stable/c/badad6fad60def1b9805559dd81dbab3d97b82aa",
        "https://git.kernel.org/stable/c/eba5df21eda0fe7418efbea2f799f8ea1b8ca94c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52908.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-52908",
        "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/2026/52xxx/CVE-2026-52908.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-52908",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513411,
  "published_at": "2026-06-19T14:00:35.971+00:00"
}