{"id":"CVE-2026-80917","revision":"4e3e0381bdf14677b0213d615535b71a","records":[{"revision":"4e3e0381bdf14677b0213d615535b71a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80917","aliases":[],"title":"PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems","description":"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->add_bus callback (pci_ecam_add_bus) to populate the per-bus mapping in\ncfg->winp[]. 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 ->add_bus\nand ->remove_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 [] pci_generic_config_read+0x40/0xb0\n [] pci_bus_read_config_dword+0x50/0xb0\n [] pci_bus_generic_read_dev_vendor_id+0x3c/0x1ec\n [] pci_scan_single_device+0xa4/0x11c\n [] pci_scan_slot+0x9c/0x23c\n [] pci_scan_child_bus_extend+0x58/0x2f4\n [] pci_scan_root_bus_bridge+0x64/0xe8\n [] pci_host_probe+0x20/0xc8\n [] pci_host_common_probe+0x144/0x1e4\n\nFix this by giving the CAM ops the same ->add_bus/->remove_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]","state":0,"publishedAt":"2026-09-09T16:13:15.202+00:00","modifiedAt":"2026-10-19T08:45:01.637+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/pci/controller/pci-host-generic.c\",\n \"drivers/pci/ecam.c\",\n \"include/linux/pci-ecam.h\"\n ],\n \"versions\": [\n {\n \"version\": \"8fe55ef23387ce3c7488375b1fd539420d7654bb\",\n \"lessThan\": \"5e52eb0290f66ba0732956dcb1e365b5ca3c5108\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8fe55ef23387ce3c7488375b1fd539420d7654bb\",\n \"lessThan\": \"baf9b0383ff770fdff123d3a832f3a99641d96dd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8fe55ef23387ce3c7488375b1fd539420d7654bb\",\n \"lessThan\": \"8d08713ec83a18526d1ed1fd5f0d2b901d103a10\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8fe55ef23387ce3c7488375b1fd539420d7654bb\",\n \"lessThan\": \"74456843f18ba7f3045974d7e8b88ab993152b8c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8fe55ef23387ce3c7488375b1fd539420d7654bb\",\n \"lessThan\": \"0c55707bd5d0d7670704cfd0dda933809b052f67\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8fe55ef23387ce3c7488375b1fd539420d7654bb\",\n \"lessThan\": \"a199293f3038db8d31d47aa60f1e18272cd82354\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8fe55ef23387ce3c7488375b1fd539420d7654bb\",\n \"lessThan\": \"0916948026f623844acd08888f7cbedbf1c48d6b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8fe55ef23387ce3c7488375b1fd539420d7654bb\",\n \"lessThan\": \"008cb88edb41f3c7c8e0ed763ff9f26719830984\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"0b5877a1aeacdbf32b3bea91326592004ec7806f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"a037ebbe72a4f98495b193112e2b2000e5e09eb5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.12.19\",\n \"lessThan\": \"5.13\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.13.4\",\n \"lessThan\": \"5.14\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/pci/controller/pci-host-generic.c\",\n \"drivers/pci/ecam.c\",\n \"include/linux/pci-ecam.h\"\n ],\n \"versions\": [\n {\n \"version\": \"5.14\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.14\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.218\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.185\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.154\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.106\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.47\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.11\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.1\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/5e52eb0290f66ba0732956dcb1e365b5ca3c5108","https://git.kernel.org/stable/c/baf9b0383ff770fdff123d3a832f3a99641d96dd","https://git.kernel.org/stable/c/8d08713ec83a18526d1ed1fd5f0d2b901d103a10","https://git.kernel.org/stable/c/74456843f18ba7f3045974d7e8b88ab993152b8c","https://git.kernel.org/stable/c/0c55707bd5d0d7670704cfd0dda933809b052f67","https://git.kernel.org/stable/c/a199293f3038db8d31d47aa60f1e18272cd82354","https://git.kernel.org/stable/c/0916948026f623844acd08888f7cbedbf1c48d6b","https://git.kernel.org/stable/c/008cb88edb41f3c7c8e0ed763ff9f26719830984"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80917","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80917","identifiers":["CVE-2026-80917"]},"retained":false,"historicalAffected":[]}],"coverage":[]}