ghsa-h3qj-j9m5-8ffr
Vulnerability from github
Published
2024-02-28 09:30
Modified
2025-04-12 00:30
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

xprtrdma: Fix cwnd update ordering

After a reconnect, the reply handler is opening the cwnd (and thus enabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs() can post enough Receive WRs to receive their replies. This causes an RNR and the new connection is lost immediately.

The race is most clearly exposed when KASAN and disconnect injection are enabled. This slows down rpcrdma_rep_create() enough to allow the send side to post a bunch of RPC Calls before the Receive completion handler can invoke ib_post_recv().

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47001"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-02-28T09:15:38Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Fix cwnd update ordering\n\nAfter a reconnect, the reply handler is opening the cwnd (and thus\nenabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs()\ncan post enough Receive WRs to receive their replies. This causes an\nRNR and the new connection is lost immediately.\n\nThe race is most clearly exposed when KASAN and disconnect injection\nare enabled. This slows down rpcrdma_rep_create() enough to allow\nthe send side to post a bunch of RPC Calls before the Receive\ncompletion handler can invoke ib_post_recv().",
  "id": "GHSA-h3qj-j9m5-8ffr",
  "modified": "2025-04-12T00:30:26Z",
  "published": "2024-02-28T09:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47001"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eddae8be7944096419c2ae29477a45f767d0fcd4"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20250411-0001"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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