{"id":"CVE-2026-98640","state":"PUBLISHED","title":"HID: amd_sfh: Validate PCI BAR size before mapping","description":"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.","publishedAt":"2026-10-18T15:20:11.777Z","updatedAt":"2026-10-19T09:23:09.980Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"92bf2883da0306ab9d1eb794acd1058fc5088ebc","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"7b3747d77767f066ccf4a9e8e3a8381643ab5368","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"5ff24aa7af0bca0780fe4e6effce902065f2c0a7","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"dc687489131559ee52f447592f6d039a5a013061","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"5f9e2ecb725adced013fbf5f94b9f185fad2e7d9","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"ee25833f037fa22d23ffdbfeebabe3579e8a0346","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"65bcc5f89704efe5b9d69d4ea2c1002d90c31382","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/amd-sfh-hid/amd_sfh_common.h","drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/amd-sfh-hid/amd_sfh_common.h","drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"]}],"references":["https://git.kernel.org/stable/c/92bf2883da0306ab9d1eb794acd1058fc5088ebc","https://git.kernel.org/stable/c/7b3747d77767f066ccf4a9e8e3a8381643ab5368","https://git.kernel.org/stable/c/5ff24aa7af0bca0780fe4e6effce902065f2c0a7","https://git.kernel.org/stable/c/dc687489131559ee52f447592f6d039a5a013061","https://git.kernel.org/stable/c/5f9e2ecb725adced013fbf5f94b9f185fad2e7d9","https://git.kernel.org/stable/c/ee25833f037fa22d23ffdbfeebabe3579e8a0346","https://git.kernel.org/stable/c/65bcc5f89704efe5b9d69d4ea2c1002d90c31382"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98640.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98640","state":"PUBLISHED","datePublished":"2026-10-18T15:20:11.777Z","dateUpdated":"2026-10-19T09:23:09.980Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.361Z"},"containers":{"cna":{"title":"HID: amd_sfh: Validate PCI BAR size before mapping","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"92bf2883da0306ab9d1eb794acd1058fc5088ebc","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"7b3747d77767f066ccf4a9e8e3a8381643ab5368","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"5ff24aa7af0bca0780fe4e6effce902065f2c0a7","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"dc687489131559ee52f447592f6d039a5a013061","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"5f9e2ecb725adced013fbf5f94b9f185fad2e7d9","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"ee25833f037fa22d23ffdbfeebabe3579e8a0346","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","status":"affected","lessThan":"65bcc5f89704efe5b9d69d4ea2c1002d90c31382","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/amd-sfh-hid/amd_sfh_common.h","drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.11","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.11","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.112","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.55","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.9","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hid/amd-sfh-hid/amd_sfh_common.h","drivers/hid/amd-sfh-hid/amd_sfh_pcie.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:23:09.980Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}