{"id":"CVE-2026-80917","title":"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 e…","summary":"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 e…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 8fe55ef23387ce3c7488375b1fd539420d7654bb < 5e52eb0290f66ba0732956dcb1e365b5ca3c5108","Linux >= 8fe55ef23387ce3c7488375b1fd539420d7654bb < baf9b0383ff770fdff123d3a832f3a99641d96dd","Linux >= 8fe55ef23387ce3c7488375b1fd539420d7654bb < 8d08713ec83a18526d1ed1fd5f0d2b901d103a10","Linux >= 8fe55ef23387ce3c7488375b1fd539420d7654bb < 74456843f18ba7f3045974d7e8b88ab993152b8c","Linux >= 8fe55ef23387ce3c7488375b1fd539420d7654bb < 0c55707bd5d0d7670704cfd0dda933809b052f67","Linux >= 8fe55ef23387ce3c7488375b1fd539420d7654bb < a199293f3038db8d31d47aa60f1e18272cd82354","Linux >= 8fe55ef23387ce3c7488375b1fd539420d7654bb < 0916948026f623844acd08888f7cbedbf1c48d6b","Linux >= 8fe55ef23387ce3c7488375b1fd539420d7654bb < 008cb88edb41f3c7c8e0ed763ff9f26719830984","Linux 0b5877a1aeacdbf32b3bea91326592004ec7806f","Linux a037ebbe72a4f98495b193112e2b2000e5e09eb5","Linux >= 5.12.19 < 5.13","Linux >= 5.13.4 < 5.14","Linux 5.14"],"published":"2026-09-09","updated":"2026-09-09","sourceUpdated":"2026-09-09T17:17:46.680","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-80917","references":[{"url":"https://git.kernel.org/stable/c/008cb88edb41f3c7c8e0ed763ff9f26719830984","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0916948026f623844acd08888f7cbedbf1c48d6b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0c55707bd5d0d7670704cfd0dda933809b052f67","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5e52eb0290f66ba0732956dcb1e365b5ca3c5108","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/74456843f18ba7f3045974d7e8b88ab993152b8c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8d08713ec83a18526d1ed1fd5f0d2b901d103a10","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a199293f3038db8d31d47aa60f1e18272cd82354","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/baf9b0383ff770fdff123d3a832f3a99641d96dd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-09T17:16:03.094Z","epss":0.00164,"epssPercentile":0.06072,"slug":"CVE-2026-80917","body":"## Overview\n\nIn 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 [<c038db9c>] pci_generic_config_read+0x40/0xb0\n [<c038da04>] pci_bus_read_config_dword+0x50/0xb0\n [<c0391e94>] pci_bus_generic_read_dev_vendor_id+0x3c/0x1ec\n [<c039245c>] pci_scan_single_device+0xa4/0x11c\n [<c0392570>] pci_scan_slot+0x9c/0x23c\n [<c039388c>] pci_scan_child_bus_extend+0x58/0x2f4\n [<c0393db0>] pci_scan_root_bus_bridge+0x64/0xe8\n [<c0393e54>] pci_host_probe+0x20/0xc8\n [<c03bc6f4>] 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]\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}