{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80917","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.801Z","datePublished":"2026-09-09T16:13:15.202Z","dateUpdated":"2026-09-09T16:13:15.202Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-09T16:13:15.202Z"},"descriptions":[{"lang":"en","value":"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 [<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]"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/controller/pci-host-generic.c","drivers/pci/ecam.c","include/linux/pci-ecam.h"],"versions":[{"version":"8fe55ef23387ce3c7488375b1fd539420d7654bb","lessThan":"5e52eb0290f66ba0732956dcb1e365b5ca3c5108","status":"affected","versionType":"git"},{"version":"8fe55ef23387ce3c7488375b1fd539420d7654bb","lessThan":"baf9b0383ff770fdff123d3a832f3a99641d96dd","status":"affected","versionType":"git"},{"version":"8fe55ef23387ce3c7488375b1fd539420d7654bb","lessThan":"8d08713ec83a18526d1ed1fd5f0d2b901d103a10","status":"affected","versionType":"git"},{"version":"8fe55ef23387ce3c7488375b1fd539420d7654bb","lessThan":"74456843f18ba7f3045974d7e8b88ab993152b8c","status":"affected","versionType":"git"},{"version":"8fe55ef23387ce3c7488375b1fd539420d7654bb","lessThan":"0c55707bd5d0d7670704cfd0dda933809b052f67","status":"affected","versionType":"git"},{"version":"8fe55ef23387ce3c7488375b1fd539420d7654bb","lessThan":"a199293f3038db8d31d47aa60f1e18272cd82354","status":"affected","versionType":"git"},{"version":"8fe55ef23387ce3c7488375b1fd539420d7654bb","lessThan":"0916948026f623844acd08888f7cbedbf1c48d6b","status":"affected","versionType":"git"},{"version":"8fe55ef23387ce3c7488375b1fd539420d7654bb","lessThan":"008cb88edb41f3c7c8e0ed763ff9f26719830984","status":"affected","versionType":"git"},{"version":"0b5877a1aeacdbf32b3bea91326592004ec7806f","status":"affected","versionType":"git"},{"version":"a037ebbe72a4f98495b193112e2b2000e5e09eb5","status":"affected","versionType":"git"},{"version":"5.12.19","lessThan":"5.13","status":"affected","versionType":"semver"},{"version":"5.13.4","lessThan":"5.14","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/controller/pci-host-generic.c","drivers/pci/ecam.c","include/linux/pci-ecam.h"],"versions":[{"version":"5.14","status":"affected"},{"version":"0","lessThan":"5.14","status":"unaffected","versionType":"semver"},{"version":"5.15.218","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.185","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.154","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.106","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.47","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.11","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2.1","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"5.15.218"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.1.185"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.6.154"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.12.106"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.18.47"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.1.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.2.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"7.3-rc1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13.4"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/5e52eb0290f66ba0732956dcb1e365b5ca3c5108"},{"url":"https://git.kernel.org/stable/c/baf9b0383ff770fdff123d3a832f3a99641d96dd"},{"url":"https://git.kernel.org/stable/c/8d08713ec83a18526d1ed1fd5f0d2b901d103a10"},{"url":"https://git.kernel.org/stable/c/74456843f18ba7f3045974d7e8b88ab993152b8c"},{"url":"https://git.kernel.org/stable/c/0c55707bd5d0d7670704cfd0dda933809b052f67"},{"url":"https://git.kernel.org/stable/c/a199293f3038db8d31d47aa60f1e18272cd82354"},{"url":"https://git.kernel.org/stable/c/0916948026f623844acd08888f7cbedbf1c48d6b"},{"url":"https://git.kernel.org/stable/c/008cb88edb41f3c7c8e0ed763ff9f26719830984"}],"title":"PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems","x_generator":{"engine":"bippy-1.2.0"}}}}