net/smc: Transitional solution for clcsock race issue

{
  "id": "899d2435babea4eb969d515e71282bf7158b91860a74a7a62672ebe808ea6416",
  "url": "https://osv.dev/vulnerability/CVE-2022-48751",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net/smc: Transitional solution for clcsock race issue",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net/smc: Transitional solution for clcsock race issue We encountered a crash in smc_setsockopt() and it is caused by accessing smc->clcsock after clcsock was released. BUG: kernel NULL pointer dereference, address: 0000000000000020 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53 RIP: 0010:smc_setsockopt+0x59/0x280 [smc] Call Trace: __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e This patch tries to fix it by holding clcsock_release_lock and checking whether clcsock has already been released before access. In case that a crash of the same reason happens in smc_getsockopt() or smc_switch_to_fallback(), this patch also checkes smc->clcsock in them too. And the caller of smc_switch_to_fallback() will identify whether fallback succeeds according to the return value.",
    "evidence": "osv:CVE-2022-48751",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.15.19",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
          }
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        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-48751",
      "aliases": [
        "CVE-2022-48751"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
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                  "fixed": "4284225cd8001e134f5cf533a7cd244bbb654d0f"
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              "type": "GIT",
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                  "introduced": "4.19.299"
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                  "fixed": "4.20"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48751.json"
          }
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.1.0"
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                  "fixed": "5.15.19"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-48751.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:42.085532184Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34",
        "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f",
        "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48751.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-48751",
        "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/2022/48xxx/CVE-2022-48751.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-48751",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 509747,
  "published_at": "2024-06-20T11:13:32.575+00:00"
}