{"id":"CVE-2026-98640","summary":"HID: amd_sfh: Validate PCI BAR size before mapping","details":"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.","modified":"2026-10-19T02:47:03.844162940Z","published":"2026-10-18T15:20:11.777Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98640.json","cna_assigner":"Linux"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5f9e2ecb725adced013fbf5f94b9f185fad2e7d9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5ff24aa7af0bca0780fe4e6effce902065f2c0a7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/65bcc5f89704efe5b9d69d4ea2c1002d90c31382"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7b3747d77767f066ccf4a9e8e3a8381643ab5368"},{"type":"WEB","url":"https://git.kernel.org/stable/c/92bf2883da0306ab9d1eb794acd1058fc5088ebc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc687489131559ee52f447592f6d039a5a013061"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ee25833f037fa22d23ffdbfeebabe3579e8a0346"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98640.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98640"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4f567b9f8141a86c7d878fadf136e5d1408e3e61"},{"fixed":"92bf2883da0306ab9d1eb794acd1058fc5088ebc"},{"fixed":"7b3747d77767f066ccf4a9e8e3a8381643ab5368"},{"fixed":"5ff24aa7af0bca0780fe4e6effce902065f2c0a7"},{"fixed":"dc687489131559ee52f447592f6d039a5a013061"},{"fixed":"5f9e2ecb725adced013fbf5f94b9f185fad2e7d9"},{"fixed":"ee25833f037fa22d23ffdbfeebabe3579e8a0346"},{"fixed":"65bcc5f89704efe5b9d69d4ea2c1002d90c31382"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98640.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.55"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98640.json"}}],"schema_version":"1.9.0"}