{ "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": "2026-10-19T08:45:01.637Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:45:01.637Z" }, "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 [] 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]" } ], "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", "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" }, { "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" } } } }