CVE-2026-90409 (GCVE-0-2026-90409)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-21 12:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/panthor: Add vm_bind region with kbo range overlap check When a VM is created, caller has to specify the range of the address space carve-out set aside for mapping kernel BO's. That means vm_bind mappings of UM-exposed BO's should not intersect with that region, but at the moment we're not checking this. At first, I thought of giving these values to drm_gpuvm_init() through its reserve_{offset, range} arguments, but it turns out that is meant for VM address spans that are not managed through the usual drm_gpuvm split/merge circuit, so storing the end of the user VA range at VM creation time and doing a quick check in the vm_bind ioctl path was the simplest workaround. The new check also makes sure vm_bind range doesn't overflow the size of a 64-bit unsigned integer. That was already being done further down the call stack inside drm_gpuvm_sm_map -> drm_gpuvm_range_valid, but it's best to fail early in the driver before GPUVM functions are invoked so that we won't waste time allocating vm_bind context resources.
References
Impacted products
Vendor Product Version
Linux Linux Version: 647810ec247641eb5aec8caef818919a4518a0b1
Version: 647810ec247641eb5aec8caef818919a4518a0b1
Version: 647810ec247641eb5aec8caef818919a4518a0b1
Version: 647810ec247641eb5aec8caef818919a4518a0b1
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/panthor/panthor_mmu.c"
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              "versionType": "original_commit_for_fix"
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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\ndrm/panthor: Add vm_bind region with kbo range overlap check\n\nWhen a VM is created, caller has to specify the range of the address space\ncarve-out set aside for mapping kernel BO\u0027s. That means vm_bind mappings of\nUM-exposed BO\u0027s should not intersect with that region, but at the moment\nwe\u0027re not checking this.\n\nAt first, I thought of giving these values to drm_gpuvm_init() through its\nreserve_{offset, range} arguments, but it turns out that is meant for VM\naddress spans that are not managed through the usual drm_gpuvm split/merge\ncircuit, so storing the end of the user VA range at VM creation time and\ndoing a quick check in the vm_bind ioctl path was the simplest workaround.\n\nThe new check also makes sure vm_bind range doesn\u0027t overflow the size of a\n64-bit unsigned integer. That was already being done further down the call\nstack inside drm_gpuvm_sm_map -\u003e drm_gpuvm_range_valid, but it\u0027s best to\nfail early in the driver before GPUVM functions are invoked so that we\nwon\u0027t waste time allocating vm_bind context resources."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:51:32.495Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/276753aaad65e6f7dac7989a600c1c2d3a382c1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/f2be47fa8e225968eb66863657143fe900ec4bca"
        },
        {
          "url": "https://git.kernel.org/stable/c/761cf9c63274a5b711c3dc829601723215710d2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/985f5e12f3cdf43030e13c2bbd154913133b5c3f"
        }
      ],
      "title": "drm/panthor: Add vm_bind region with kbo range overlap check",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90409",
    "datePublished": "2026-09-17T16:09:36.740Z",
    "dateReserved": "2026-09-11T19:38:34.812Z",
    "dateUpdated": "2026-10-21T12:51:32.495Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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