{"schema":"threatline.record/2","record":{"id":"CVE-2026-98640","aliases":[],"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->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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98640","source_modified_at":"2026-10-19T09:23:09.980Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","lessThan":"92bf2883da0306ab9d1eb794acd1058fc5088ebc","status":"affected","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","lessThan":"7b3747d77767f066ccf4a9e8e3a8381643ab5368","status":"affected","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","lessThan":"5ff24aa7af0bca0780fe4e6effce902065f2c0a7","status":"affected","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","lessThan":"dc687489131559ee52f447592f6d039a5a013061","status":"affected","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","lessThan":"5f9e2ecb725adced013fbf5f94b9f185fad2e7d9","status":"affected","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","lessThan":"ee25833f037fa22d23ffdbfeebabe3579e8a0346","status":"affected","versionType":"git"},{"version":"4f567b9f8141a86c7d878fadf136e5d1408e3e61","lessThan":"65bcc5f89704efe5b9d69d4ea2c1002d90c31382","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98640","source_modified_at":"2026-10-19T09:23:09.980Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.11","status":"affected"},{"version":"0","lessThan":"5.11","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.55","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.9","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98640","source_modified_at":"2026-10-19T09:23:09.980Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"92bf2883da0306ab9d1eb794acd1058fc5088ebc","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98640","source_modified_at":"2026-10-19T09:23:09.980Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7b3747d77767f066ccf4a9e8e3a8381643ab5368","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98640","source_modified_at":"2026-10-19T09:23:09.980Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5ff24aa7af0bca0780fe4e6effce902065f2c0a7","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98640","source_modified_at":"2026-10-19T09:23:09.980Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5f9e2ecb725adced013fbf5f94b9f185fad2e7d9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98640","source_modified_at":"2026-10-19T09:23:09.980Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"65bcc5f89704efe5b9d69d4ea2c1002d90c31382","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00205,"percentile":0.10027,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:20:11.777Z","modified_at":"2026-10-19T09:23:09.980Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98640","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:23:09.980Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98640","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/92bf2883da0306ab9d1eb794acd1058fc5088ebc"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7b3747d77767f066ccf4a9e8e3a8381643ab5368"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/5ff24aa7af0bca0780fe4e6effce902065f2c0a7"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/dc687489131559ee52f447592f6d039a5a013061"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/5f9e2ecb725adced013fbf5f94b9f185fad2e7d9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ee25833f037fa22d23ffdbfeebabe3579e8a0346"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/65bcc5f89704efe5b9d69d4ea2c1002d90c31382"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:23:09.980Z","content_hash":"ccb42e7da0f5302b488f7a5a4b93cace92e6b7974de2468a101a9ad7da999f03"}}