{"id":"AZL-99957","summary":"CVE-2026-80917 affecting package kernel 6.6.150.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems\n\nOn 32-bit systems the config space is too large to ioremap in one go, so\npci_ecam_create() maps each bus segment separately and relies on the\n-\u003eadd_bus callback (pci_ecam_add_bus) to populate the per-bus mapping in\ncfg-\u003ewinp[]. pci_ecam_map_bus() then uses that mapping as the base for\nevery config access.\n\nThe generic ECAM ops (pci_generic_ecam_ops) already provide the -\u003eadd_bus\nand -\u003eremove_bus callbacks, but the CAM (legacy) ops in pci-host-generic.c\ndo not. As a result, on a 32-bit host using \"pci-host-cam-generic\" the\nper-bus mapping is never set up and the first config read dereferences a\nNULL base, crashing during bus enumeration:\n\n Unable to handle kernel NULL pointer dereference at virtual address 00000800\n Oops [#1]\n CPU: 0 PID: 1 Comm: swapper Not tainted 6.9.7+ #43\n Hardware name: Digilent Nexys-Video-A7 RV32 (DT)\n epc : pci_generic_config_read+0x40/0xb0\n  ra : pci_generic_config_read+0x2c/0xb0\n [\u003cc038db9c\u003e] pci_generic_config_read+0x40/0xb0\n [\u003cc038da04\u003e] pci_bus_read_config_dword+0x50/0xb0\n [\u003cc0391e94\u003e] pci_bus_generic_read_dev_vendor_id+0x3c/0x1ec\n [\u003cc039245c\u003e] pci_scan_single_device+0xa4/0x11c\n [\u003cc0392570\u003e] pci_scan_slot+0x9c/0x23c\n [\u003cc039388c\u003e] pci_scan_child_bus_extend+0x58/0x2f4\n [\u003cc0393db0\u003e] pci_scan_root_bus_bridge+0x64/0xe8\n [\u003cc0393e54\u003e] pci_host_probe+0x20/0xc8\n [\u003cc03bc6f4\u003e] pci_host_common_probe+0x144/0x1e4\n\nFix this by giving the CAM ops the same -\u003eadd_bus/-\u003eremove_bus callbacks.\nSince pci_ecam_add_bus() and pci_ecam_remove_bus() are static to ecam.c,\nmove the CAM ops definition there as pci_generic_cam_ops (mirroring\npci_generic_ecam_ops) and export it for pci-host-generic.c to reference.\n\n[mani: removed timestamp from log]","modified":"2026-09-12T05:27:53Z","published":"2026-09-09T17:17:46Z","upstream":["CVE-2026-80917"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80917"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"6.6.150.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-99957.json"}}],"schema_version":"1.9.0"}