RDMA/core: Fix use after free in ib_query_qp()

{
  "id": "73e3a43a78218b559c400e9156267c1431de07b0db99f36317ef8ab035a2e451",
  "url": "https://osv.dev/vulnerability/CVE-2026-92512",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RDMA/core: Fix use after free in ib_query_qp()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix use after free in ib_query_qp() When querying a QP via the netlink flow the only synchronization mechanism for the said QP is rdma_restrack_get(), meanwhile during the QP destroy path rdma_restrack_del() is called at the end of the ib_destroy_qp_user() function which is too late, since by then the vendor specific resources for said QP would already be destroyed, and till the rdma_restrack_del() is called this QP can still be accessed, which could cause the use after free below. Fix this by moving the rdma_restrack_begin_del() to the start of the ib_destroy_qp_user(), which in turn waits for all usages of the QP to be done then removes it from the database to prevent access to it while it is being destroyed. RIP: 0010:ib_query_qp+0x15/0x50 [ib_core] Code: 48 83 05 5d 8e b9 ff 01 eb b5 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 c7 46 40 00 00 00 00 48 c7 46 78 00 00 00 00 <48> 8b 07 48 8b 80 88 01 00 00 48 85 c0 74 1a 48 83 05 54 91 b9 ff RSP: 0018:ff11000108a8f2f0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ff11000108a8f370 RCX: ff11000108a8f370 RDX: 0000000000000000 RSI: ff11000108a8f3d8 RDI: 0000000000000000 RBP: ff1100010de5a000 R08: 0000000000000e80 R09: 0000000000000004 R10: ff110001057a604c R11: 0000000000000000 R12: ff11000108a8f370 R13: ff110001090e8000 R14: 0000000000000000 R15: ff110001057a602c FS: 00007f2ffd8db6c0(0000) GS:ff110008dc90b000(0000) knlGS:0000000000000000 CS: 0010",
    "evidence": "osv:CVE-2026-92512",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-92512",
      "aliases": [
        "CVE-2026-92512"
      ],
      "affected": [
        {
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                {
                  "fixed": "038cf231b7099ba6202dcc0c1ea01525122df09f"
                },
                {
                  "fixed": "001383248e5d754bbddb7ae2a8573bc8501c85d8"
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                  "fixed": "709ba0e5311bd034eb4d9c1c00cc4e1109d6dc3e"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92512.json"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92512.json"
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      ],
      "modified": "2026-10-28T02:30:37.675892605Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/001383248e5d754bbddb7ae2a8573bc8501c85d8",
        "https://git.kernel.org/stable/c/038cf231b7099ba6202dcc0c1ea01525122df09f",
        "https://git.kernel.org/stable/c/2ef2ea52ae41bd9efa83139e97ae839de7e17156",
        "https://git.kernel.org/stable/c/709ba0e5311bd034eb4d9c1c00cc4e1109d6dc3e",
        "https://git.kernel.org/stable/c/8998829739c31fdbc892078e4449887d902e5dc9",
        "https://git.kernel.org/stable/c/a608af8cde3dd38936b356bbdeedea0653a05b3f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92512.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92512",
        "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/2026/92xxx/CVE-2026-92512.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-92512",
        "evidence": "/id"
      }
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 505290,
  "published_at": "2026-09-17T16:10:22.114+00:00"
}