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CVE-2026-98640

Linux: HID: amd_sfh: Validate PCI BAR size before mapping

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.21%Chance of exploitation activity in the next 30 days, higher than 10% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in92bf2883da0306ab9d1eb794acd1058fc5088ebcAlso 7b3747d77767f066ccf4a9e8e3a8381643ab5368, 5ff24aa7af0bca0780fe4e6effce902065f2c0a7 and 2 moreCVE List
Published18 Oct 2026Updated 19 Oct 2026CVE List

What fixes it

  • 92bf2883da0306ab9d1eb794acd1058fc5088ebcLinuxCVE List
  • 7b3747d77767f066ccf4a9e8e3a8381643ab5368LinuxCVE List
  • 5ff24aa7af0bca0780fe4e6effce902065f2c0a7LinuxCVE List
  • 5f9e2ecb725adced013fbf5f94b9f185fad2e7d9LinuxCVE List
  • 65bcc5f89704efe5b9d69d4ea2c1002d90c31382LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 16

  • Linuxaffected: 4f567b9f8141a86c7d878fadf136e5d1408e3e61 before 92bf2883da0306ab9d1eb794acd1058fc5088ebcCVE List
  • Linuxaffected: 4f567b9f8141a86c7d878fadf136e5d1408e3e61 before 7b3747d77767f066ccf4a9e8e3a8381643ab5368CVE List
  • Linuxaffected: 4f567b9f8141a86c7d878fadf136e5d1408e3e61 before 5ff24aa7af0bca0780fe4e6effce902065f2c0a7CVE List
  • Linuxaffected: 4f567b9f8141a86c7d878fadf136e5d1408e3e61 before dc687489131559ee52f447592f6d039a5a013061CVE List
  • Linuxaffected: 4f567b9f8141a86c7d878fadf136e5d1408e3e61 before 5f9e2ecb725adced013fbf5f94b9f185fad2e7d9CVE List
  • Linuxaffected: 4f567b9f8141a86c7d878fadf136e5d1408e3e61 before ee25833f037fa22d23ffdbfeebabe3579e8a0346CVE List
  • Linuxaffected: 4f567b9f8141a86c7d878fadf136e5d1408e3e61 before 65bcc5f89704efe5b9d69d4ea2c1002d90c31382CVE List
  • Linuxaffected: 5.11CVE List
  • Linuxunaffected: all versions before 5.11CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.112 through 6.12.*CVE List
  • Linuxunaffected: 6.18.55 through 6.18.*CVE List
  • Linuxunaffected: 7.2.9 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 7