net/rds: acquire the fastpath locks in rds_conn_shutdown()

{
  "id": "1a62c05a78712955b7bd387e1d100653b35359ea91c315089715d799ea2c239e",
  "url": "https://osv.dev/vulnerability/CVE-2026-98069",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net/rds: acquire the fastpath locks in rds_conn_shutdown()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net/rds: acquire the fastpath locks in rds_conn_shutdown() rds_conn_shutdown() quiesces the transmit and receive-refill paths by waiting for RDS_IN_XMIT and RDS_RECV_REFILL to be sampled clear, and then runs the transport shutdown and rds_conn_path_reset(). Sampling the bits clear is not the same as owning them: the moment after the wait_event() returns, rds_send_xmit() can re-acquire RDS_IN_XMIT (or rds_ib_recv_refill() can re-acquire RDS_RECV_REFILL) and run concurrently with the teardown. The sender does recheck the connection state after taking the lock, but that recheck is a classic store-buffering pattern: teardown writes the state and reads the bit while the sender writes the bit and reads the state. acquire_in_xmit() is only an acquire operation, so on weakly ordered architectures both sides can miss each other's write, and the transmit path then runs while the transport zeroes its rings (e.g. rds_ib_ring_init()) and rds_send_path_reset() rewrites the transmit state under it. Oracle UEK fixed the same class of crashes - a 14-year tail of BUG_ON()s in rds_ib_sub_signaled(), unexpected op-codes and NULL dereferences in rds_ib_send_cqe_handler() during failover testing - by making the teardown path *acquire* the fastpath bit locks instead of testing them (\"rds: Make sure transmit path and connection tear-down does not run concurrently\"). Ownership of a single word is decided by RMW atomicity, so no cross",
    "evidence": "osv:CVE-2026-98069",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.271",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.222",
            "evidence": "/affected/1/ranges"
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            "value": "6.1.189",
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            "value": "6.6.158",
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          {
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            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-98069",
      "aliases": [
        "CVE-2026-98069"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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                {
                  "fixed": "1f900f585cbb0fbe6aa00c31c9f5bb63ee614456"
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                  "fixed": "32e21bcf4b5b11454bf57c4bb3bf019b71512ace"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98069.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
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      ],
      "modified": "2026-10-28T02:30:21.411076783Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1f900f585cbb0fbe6aa00c31c9f5bb63ee614456",
        "https://git.kernel.org/stable/c/1fe627e5db5c3f53a9f9f9c8a66671755d306955",
        "https://git.kernel.org/stable/c/2e46248e375a516301884719f08b6015c79a6456",
        "https://git.kernel.org/stable/c/32e21bcf4b5b11454bf57c4bb3bf019b71512ace",
        "https://git.kernel.org/stable/c/7f4f21e4439df30d9aca9fb3bac38191a2f34729",
        "https://git.kernel.org/stable/c/7febb113795d5de5b690b208f4b0e64a5fad1201",
        "https://git.kernel.org/stable/c/813f3582ac7ae9f60f917937d54660e0952d5f2d",
        "https://git.kernel.org/stable/c/900e96c9749a06833801f60c393aa1d405ea226c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98069.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98069",
        "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/2026/98xxx/CVE-2026-98069.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98069",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 487793,
  "published_at": "2026-09-25T10:24:10.887+00:00"
}