CVE-2026-53158 (GCVE-0-2026-53158)
Vulnerability from cvelistv5
Published
2026-06-25 08:38
Modified
2026-07-04 11:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Fix NULL pointer dereference in rpmsg callback A NULL pointer dereference was observed on Hawi at boot when the DSP sends a glink message before fastrpc_rpmsg_probe() has completed initialization: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000178 pc : _raw_spin_lock_irqsave+0x34/0x8c lr : fastrpc_rpmsg_callback+0x3c/0xcc [fastrpc] ... Call trace: _raw_spin_lock_irqsave+0x34/0x8c (P) fastrpc_rpmsg_callback+0x3c/0xcc [fastrpc] qcom_glink_native_rx+0x538/0x6a4 qcom_glink_smem_intr+0x14/0x24 [qcom_glink_smem] The faulting address 0x178 corresponds to the lock variable inside struct fastrpc_channel_ctx, confirming that cctx is NULL when fastrpc_rpmsg_callback() attempts to take the spinlock. There are two issues here. First, dev_set_drvdata() is called before spin_lock_init() and idr_init(), leaving a window where the callback can retrieve a valid cctx pointer but operate on an uninitialized spinlock. Second, the rpmsg channel becomes live as soon as the driver is bound, so fastrpc_rpmsg_callback() can fire before dev_set_drvdata() is called at all, resulting in dev_get_drvdata() returning NULL. Fix both issues by moving all cctx initialization ahead of dev_set_drvdata() so the structure is fully initialized before it becomes visible to the callback, and add a NULL check in fastrpc_rpmsg_callback() as a guard against any remaining window.
References
Impacted products
Vendor Product Version
Linux Linux Version: f6f9279f2bf0e37e2f1fb119d8832b8568536a04
Version: f6f9279f2bf0e37e2f1fb119d8832b8568536a04
Version: f6f9279f2bf0e37e2f1fb119d8832b8568536a04
Version: f6f9279f2bf0e37e2f1fb119d8832b8568536a04
Version: f6f9279f2bf0e37e2f1fb119d8832b8568536a04
Version: f6f9279f2bf0e37e2f1fb119d8832b8568536a04
Version: f6f9279f2bf0e37e2f1fb119d8832b8568536a04
Version: f6f9279f2bf0e37e2f1fb119d8832b8568536a04
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/fastrpc.c"
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      ],
      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-04T11:50:56.161Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a3d91218ccca1e990bfb737b5a6da23f0afba22b"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d8c64511fd45690c5326f013710efcb4f73a97e"
        },
        {
          "url": "https://git.kernel.org/stable/c/150bf6f1193c69252580c19d3b3cd631ddce61d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/8fb4a23df5b7c02929b62e5dbc270ec7c42b8134"
        },
        {
          "url": "https://git.kernel.org/stable/c/4bfdf0a9855df55e9e031ca6a25b855820590c70"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5de9cb5355db36438edc621dde3673e3f235767"
        },
        {
          "url": "https://git.kernel.org/stable/c/d77583ca33299fede0c194744ef2284e7ba5b763"
        },
        {
          "url": "https://git.kernel.org/stable/c/5401fb4fe10fac6134c308495df18ed74aebb9c4"
        }
      ],
      "title": "misc: fastrpc: Fix NULL pointer dereference in rpmsg callback",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53158",
    "datePublished": "2026-06-25T08:38:40.818Z",
    "dateReserved": "2026-06-09T07:44:35.388Z",
    "dateUpdated": "2026-07-04T11:50:56.161Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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