CVE-2026-98640

Status: ReceivedUnscored—

Severity—Unscored

Exploitation probability0.21 %higher than 10% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

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():

Read full descriptionShow less

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.

Technical details traces, logs and code from the original report

  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

CVSS

NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.21 %
Percentile among all scored CVEs: 10
Score date: 10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Show 7 references

Raw JSON (NVD)

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{
  "id": "CVE-2026-98640",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
              "lessThan": "92bf2883da0306ab9d1eb794acd1058fc5088ebc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
              "lessThan": "7b3747d77767f066ccf4a9e8e3a8381643ab5368",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
              "lessThan": "5ff24aa7af0bca0780fe4e6effce902065f2c0a7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
              "lessThan": "dc687489131559ee52f447592f6d039a5a013061",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
              "lessThan": "5f9e2ecb725adced013fbf5f94b9f185fad2e7d9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
              "lessThan": "ee25833f037fa22d23ffdbfeebabe3579e8a0346",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4f567b9f8141a86c7d878fadf136e5d1408e3e61",
              "lessThan": "65bcc5f89704efe5b9d69d4ea2c1002d90c31382",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/hid/amd-sfh-hid/amd_sfh_common.h",
            "drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.11"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.11",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/hid/amd-sfh-hid/amd_sfh_common.h",
            "drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-18T16:17:17.123",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/5f9e2ecb725adced013fbf5f94b9f185fad2e7d9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5ff24aa7af0bca0780fe4e6effce902065f2c0a7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/65bcc5f89704efe5b9d69d4ea2c1002d90c31382",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7b3747d77767f066ccf4a9e8e3a8381643ab5368",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/92bf2883da0306ab9d1eb794acd1058fc5088ebc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dc687489131559ee52f447592f6d039a5a013061",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ee25833f037fa22d23ffdbfeebabe3579e8a0346",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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->mmio +\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   <TASK>\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."
    }
  ],
  "lastModified": "2026-10-19T10:19:28.220",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}