{"id":"CVE-2026-80917","summary":"PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems","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":"2026-10-28T02:30:21.587456394Z","published":"2026-09-09T16:13:15.202Z","related":["openSUSE-SU-2026:11773-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80917.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/008cb88edb41f3c7c8e0ed763ff9f26719830984"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0916948026f623844acd08888f7cbedbf1c48d6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0c55707bd5d0d7670704cfd0dda933809b052f67"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5e52eb0290f66ba0732956dcb1e365b5ca3c5108"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74456843f18ba7f3045974d7e8b88ab993152b8c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8d08713ec83a18526d1ed1fd5f0d2b901d103a10"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a199293f3038db8d31d47aa60f1e18272cd82354"},{"type":"WEB","url":"https://git.kernel.org/stable/c/baf9b0383ff770fdff123d3a832f3a99641d96dd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80917.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80917"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"8fe55ef23387ce3c7488375b1fd539420d7654bb"},{"fixed":"5e52eb0290f66ba0732956dcb1e365b5ca3c5108"},{"fixed":"baf9b0383ff770fdff123d3a832f3a99641d96dd"},{"fixed":"8d08713ec83a18526d1ed1fd5f0d2b901d103a10"},{"fixed":"74456843f18ba7f3045974d7e8b88ab993152b8c"},{"fixed":"0c55707bd5d0d7670704cfd0dda933809b052f67"},{"fixed":"a199293f3038db8d31d47aa60f1e18272cd82354"},{"fixed":"0916948026f623844acd08888f7cbedbf1c48d6b"},{"fixed":"008cb88edb41f3c7c8e0ed763ff9f26719830984"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.12.19"},{"fixed":"5.13"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.13.4"},{"fixed":"5.14"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0b5877a1aeacdbf32b3bea91326592004ec7806f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a037ebbe72a4f98495b193112e2b2000e5e09eb5"}]}],"versions":["v5.12.19","v5.13.19","v5.13.18","v5.13.17","v5.13.16","v5.13.15","v5.13.14","v5.13.13","v5.13.12","v5.13.11","v5.13.10","v5.13.9","v5.13.8","v5.13.7","v5.13.6","v5.13.5","v5.13.4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80917.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.14.0"},{"fixed":"5.15.218"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.185"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.154"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.106"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.47"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.11"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80917.json"}}],"schema_version":"1.9.2"}