CVE-2026-90306 (GCVE-0-2026-90306)
Vulnerability from cvelistv5
Published
2026-09-17 16:08
Modified
2026-10-19 09:01
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ARM: 9481/2: breakpoint: CFI breakpoints only on demand This removes the stub hw_breakpoint_cfi_handler() from ARM, making it not steal breakpoint type 0x03 (ARM_ENTRY_CFI_BREAKPOINT) unless CFI is actively used in the kernel. When not instrumenting with CFI, or when a breakpoint is issued in userspace, we fall through to return 1 from hw_breakpoint_pending() "unhandled fault" so userspace can make use of this breakpoint. Tested with LKDTM and this command line: echo CFI_FORWARD_PROTO > /sys/kernel/debug/provoke-crash/DIRECT still works as expected.
References
Impacted products
Vendor Product Version
Linux Linux Version: c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3
Version: c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3
Version: c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm/kernel/hw_breakpoint.c"
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          "versions": [
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          "versions": [
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              ],
              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9481/2: breakpoint: CFI breakpoints only on demand\n\nThis removes the stub hw_breakpoint_cfi_handler() from ARM, making\nit not steal breakpoint type 0x03 (ARM_ENTRY_CFI_BREAKPOINT) unless\nCFI is actively used in the kernel.\n\nWhen not instrumenting with CFI, or when a breakpoint is issued in\nuserspace, we fall through to return 1 from hw_breakpoint_pending()\n\"unhandled fault\" so userspace can make use of this breakpoint.\n\nTested with LKDTM and this command line:\necho CFI_FORWARD_PROTO \u003e /sys/kernel/debug/provoke-crash/DIRECT\nstill works as expected."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:01:24.034Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/314f1a6762b5d51b37784ed7dc701d4c3d893703"
        },
        {
          "url": "https://git.kernel.org/stable/c/da64b150e4b7bee615b33ab21f3137c31ec36922"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ed9bff906cf8036531d1559f10e82733a52b41f"
        }
      ],
      "title": "ARM: 9481/2: breakpoint: CFI breakpoints only on demand",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90306",
    "datePublished": "2026-09-17T16:08:28.387Z",
    "dateReserved": "2026-09-11T19:38:34.800Z",
    "dateUpdated": "2026-10-19T09:01:24.034Z",
    "state": "PUBLISHED"
  },
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}


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