CVE-2026-98640 (GCVE-0-2026-98640)
Vulnerability from cvelistv5
Published
2026-10-18 15:20
Modified
2026-10-19 09:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: amd_sfh: Validate PCI BAR size before mapping The amd_sfh driver maps PCI BAR 2 using pcim_iomap_regions() and subsequently accesses MMIO registers at offsets up to 0x10958 (e.g., AMD_P2C_MSG3 at 0x1068C). However, the driver never validates that the BAR size is large enough to cover these accesses. If the driver is bound to a device with a smaller BAR 2, this leads to an out-of-bounds memory access and a page fault during the probe function. For example, a page fault can occur when reading from privdata->mmio + AMD_P2C_MSG3 in mp2_select_ops(): BUG: unable to handle page fault for address: ffffc9000390368c PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 105b64067 PTE 0 Oops: Oops: 0000 [#1] SMP KASAN NOPTI RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline] RIP: 0010:mp2_select_ops drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:282 [inline] RIP: 0010:amd_mp2_pci_probe+0x337/0x5f0 drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:487 Call Trace: <TASK> local_pci_probe drivers/pci/pci-driver.c:332 [inline] pci_call_probe drivers/pci/pci-driver.c:394 [inline] __pci_device_probe drivers/pci/pci-driver.c:455 [inline] pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489 Fix this by verifying that the length of BAR 2 is at least 128KB before attempting to map it. Since the maximum accessed offset is 0x10958, and PCI BAR sizes are powers of 2, any legitimate hardware will have a BAR size of at least 128KB.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4f567b9f8141a86c7d878fadf136e5d1408e3e61
Version: 4f567b9f8141a86c7d878fadf136e5d1408e3e61
Version: 4f567b9f8141a86c7d878fadf136e5d1408e3e61
Version: 4f567b9f8141a86c7d878fadf136e5d1408e3e61
Version: 4f567b9f8141a86c7d878fadf136e5d1408e3e61
Version: 4f567b9f8141a86c7d878fadf136e5d1408e3e61
Version: 4f567b9f8141a86c7d878fadf136e5d1408e3e61
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hid/amd-sfh-hid/amd_sfh_common.h",
            "drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "programFiles": [
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            "drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "5.11"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.15.222",
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              "status": "unaffected",
              "version": "6.1.189",
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            },
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              "version": "6.6.158",
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            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
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            },
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              "status": "unaffected",
              "version": "7.2.9",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: amd_sfh: Validate PCI BAR size before mapping\n\nThe amd_sfh driver maps PCI BAR 2 using pcim_iomap_regions() and\nsubsequently accesses MMIO registers at offsets up to 0x10958 (e.g.,\nAMD_P2C_MSG3 at 0x1068C). However, the driver never validates that the BAR\nsize is large enough to cover these accesses. If the driver is bound to a\ndevice with a smaller BAR 2, this leads to an out-of-bounds memory access\nand a page fault during the probe function.\n\nFor example, a page fault can occur when reading from privdata-\u003emmio +\nAMD_P2C_MSG3 in mp2_select_ops():\n\n  BUG: unable to handle page fault for address: ffffc9000390368c\n  PGD 100000067 P4D 100000067 PUD 1012c1067 PMD 105b64067 PTE 0\n  Oops: Oops: 0000 [#1] SMP KASAN NOPTI\n  RIP: 0010:readl arch/x86/include/asm/io.h:59 [inline]\n  RIP: 0010:mp2_select_ops drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:282\n  [inline]\n  RIP: 0010:amd_mp2_pci_probe+0x337/0x5f0\n  drivers/hid/amd-sfh-hid/amd_sfh_pcie.c:487\n  Call Trace:\n   \u003cTASK\u003e\n   local_pci_probe drivers/pci/pci-driver.c:332 [inline]\n   pci_call_probe drivers/pci/pci-driver.c:394 [inline]\n   __pci_device_probe drivers/pci/pci-driver.c:455 [inline]\n   pci_device_probe+0x431/0xc90 drivers/pci/pci-driver.c:489\n\nFix this by verifying that the length of BAR 2 is at least 128KB before\nattempting to map it. Since the maximum accessed offset is 0x10958, and PCI\nBAR sizes are powers of 2, any legitimate hardware will have a BAR size of\nat least 128KB."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:23:09.980Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/92bf2883da0306ab9d1eb794acd1058fc5088ebc"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b3747d77767f066ccf4a9e8e3a8381643ab5368"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ff24aa7af0bca0780fe4e6effce902065f2c0a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc687489131559ee52f447592f6d039a5a013061"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f9e2ecb725adced013fbf5f94b9f185fad2e7d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee25833f037fa22d23ffdbfeebabe3579e8a0346"
        },
        {
          "url": "https://git.kernel.org/stable/c/65bcc5f89704efe5b9d69d4ea2c1002d90c31382"
        }
      ],
      "title": "HID: amd_sfh: Validate PCI BAR size before mapping",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98640",
    "datePublished": "2026-10-18T15:20:11.777Z",
    "dateReserved": "2026-09-25T10:25:14.361Z",
    "dateUpdated": "2026-10-19T09:23:09.980Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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