{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46027",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46027"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "net/smc: avoid early lgr access in smc_clc_wait_msg",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: avoid early lgr access in smc_clc_wait_msg\n\nA CLC decline can be received while the handshake is still in an early\nstage, before the connection has been associated with a link group.\n\nThe decline handling in smc_clc_wait_msg() updates link-group level sync\nstate for first-contact declines, but that state only exists after link\ngroup setup has completed. Guard the link-group update accordingly and\nkeep the per-socket peer diagnosis handling unchanged.\n\nThis preserves the existing sync_err handling for established link-group\ncontexts and avoids touching link-group state before it is available.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46027"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/257cdf0c5ced9c0fba8aba501d94b0a5fcef2086"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/22546729b96fc873b23065dc49e3d73c45cfb874"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5eedbfd82c2884e0010fdfb3c9446a6ebcadb691"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f0858e1d5624bb120b198f2a8528f97a9b0ae069"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6180a296ca65b08a81914805cbc0f78da5f10a1f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ea0b5d0fe96356dce38f98375a57c52a04e13712"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/83bcf9228b0501694fb2589ed1d142855a2887f2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5a8db80f721deee8e916c2cfdee78decda02ce4f"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The SMC CLC handshake runs over a TCP connection; a remote peer (a malicious client connecting to a listening SMC server, or a malicious server) triggers the dereference by sending a crafted DECLINE message, so the code is reachable purely over the network.\nAC:L - The attacker reliably crafts a DECLINE message with the SMC_FIRST_CONTACT_MASK bit set; the lgr==NULL condition is the default early-handshake state (the first message the server processes), so there is no race or condition outside attacker control.\nPR:N - On the server-side listen path the dereference occurs while processing the very first handshake message, before any authentication, so an unauthenticated remote peer requires no privileges.\nUI:N - A server with an AF_SMC listening socket processes the malicious handshake passively in a work queue with no local user action required.\nS:U - The crash is confined to the kernel's own security scope; no boundary (VM/IOMMU/sandbox) is crossed.\nC:N - This is a NULL pointer dereference with no information disclosure \u2014 no kernel memory contents are read or leaked.\nI:N - The write is to NULL plus a small fixed bitfield offset on a never-initialized pointer (not a controllable/dangling pointer), so it only crashes and provides no exploitable write primitive.\nA:H - Dereferencing the NULL lgr pointer causes a kernel oops/panic, taking down the system in a remotely-triggerable, unauthenticated denial of service."
    }
  }
}