{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53158",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-53158"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "misc: fastrpc: Fix NULL pointer dereference in rpmsg callback",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: Fix NULL pointer dereference in rpmsg callback\n\nA NULL pointer dereference was observed on Hawi at boot when the DSP\nsends a glink message before fastrpc_rpmsg_probe() has completed\ninitialization:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000178\n  pc : _raw_spin_lock_irqsave+0x34/0x8c\n  lr : fastrpc_rpmsg_callback+0x3c/0xcc [fastrpc]\n  ...\n  Call trace:\n   _raw_spin_lock_irqsave+0x34/0x8c (P)\n   fastrpc_rpmsg_callback+0x3c/0xcc [fastrpc]\n   qcom_glink_native_rx+0x538/0x6a4\n   qcom_glink_smem_intr+0x14/0x24 [qcom_glink_smem]\n\nThe faulting address 0x178 corresponds to the lock variable inside\nstruct fastrpc_channel_ctx, confirming that cctx is NULL when\nfastrpc_rpmsg_callback() attempts to take the spinlock.\n\nThere are two issues here. First, dev_set_drvdata() is called before\nspin_lock_init() and idr_init(), leaving a window where the callback\ncan retrieve a valid cctx pointer but operate on an uninitialized\nspinlock. Second, the rpmsg channel becomes live as soon as the driver\nis bound, so fastrpc_rpmsg_callback() can fire before dev_set_drvdata()\nis called at all, resulting in dev_get_drvdata() returning NULL.\n\nFix both issues by moving all cctx initialization ahead of\ndev_set_drvdata() so the structure is fully initialized before it\nbecomes visible to the callback, and add a NULL check in\nfastrpc_rpmsg_callback() as a guard against any remaining window.",
  "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": "6.1.177",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-53158"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a3d91218ccca1e990bfb737b5a6da23f0afba22b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0d8c64511fd45690c5326f013710efcb4f73a97e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/150bf6f1193c69252580c19d3b3cd631ddce61d7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8fb4a23df5b7c02929b62e5dbc270ec7c42b8134"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4bfdf0a9855df55e9e031ca6a25b855820590c70"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d5de9cb5355db36438edc621dde3673e3f235767"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d77583ca33299fede0c194744ef2284e7ba5b763"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5401fb4fe10fac6134c308495df18ed74aebb9c4"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-07-04T11:51:32Z"
  }
}