{"id":"AZL-109416","summary":"CVE-2026-98640 affecting package kernel 6.6.157.1-1","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":"2026-10-19T14:16:50.426934955Z","published":"2026-10-18T16:17:17Z","upstream":["CVE-2026-98640"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98640"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.157.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-109416.json"}}],"schema_version":"1.9.0"}