HID: amd_sfh: Validate PCI BAR size before mapping

{
  "id": "b94e81c633767a494bd1a1d8333cee2d8728271ee1f473540af109372a066cb6",
  "url": "https://osv.dev/vulnerability/CVE-2026-98640",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HID: amd_sfh: Validate PCI BAR size before mapping",
    "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: 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.",
    "evidence": "osv:CVE-2026-98640",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.222",
            "evidence": "/affected/1/ranges"
          },
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            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.55",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98640",
      "aliases": [
        "CVE-2026-98640"
      ],
      "affected": [
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          "database_specific": {
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:40.468670305Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5f9e2ecb725adced013fbf5f94b9f185fad2e7d9",
        "https://git.kernel.org/stable/c/5ff24aa7af0bca0780fe4e6effce902065f2c0a7",
        "https://git.kernel.org/stable/c/65bcc5f89704efe5b9d69d4ea2c1002d90c31382",
        "https://git.kernel.org/stable/c/7b3747d77767f066ccf4a9e8e3a8381643ab5368",
        "https://git.kernel.org/stable/c/92bf2883da0306ab9d1eb794acd1058fc5088ebc",
        "https://git.kernel.org/stable/c/dc687489131559ee52f447592f6d039a5a013061",
        "https://git.kernel.org/stable/c/ee25833f037fa22d23ffdbfeebabe3579e8a0346",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98640.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98640",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98640.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98640",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 508206,
  "published_at": "2026-10-18T15:20:11.777+00:00"
}