PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80917
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-09 17:17:46 UTC
Updated2026-09-09 17:17:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems On 32-bit systems the config space is too large to ioremap in one go, so pci_ecam_create() maps each bus segment separately and relies on the ->add_bus callback (pci_ecam_add_bus) to populate the per-bus mapping in cfg->winp[]. pci_ecam_map_bus() then uses that mapping as the base for every config access. The generic ECAM ops (pci_generic_ecam_ops) already provide the ->add_bus and ->remove_bus callbacks, but the CAM (legacy) ops in pci-host-generic.c do not. As a result, on a 32-bit host using "pci-host-cam-generic" the per-bus mapping is never set up and the first config read dereferences a NULL base, crashing during bus enumeration: Unable to handle kernel NULL pointer dereference at virtual address 00000800 Oops [#1] CPU: 0 PID: 1 Comm: swapper Not tainted 6.9.7+ #43 Hardware name: Digilent Nexys-Video-A7 RV32 (DT) epc : pci_generic_config_read+0x40/0xb0 ra : pci_generic_config_read+0x2c/0xb0 [<c038db9c>] pci_generic_config_read+0x40/0xb0 [<c038da04>] pci_bus_read_config_dword+0x50/0xb0 [<c0391e94>] pci_bus_generic_read_dev_vendor_id+0x3c/0x1ec [<c039245c>] pci_scan_single_device+0xa4/0x11c [<c0392570>] pci_scan_slot+0x9c/0x23c [<c039388c>] pci_scan_child_bus_extend+0x58/0x2f4 [<c0393db0>] pci_scan_root_bus_bridge+0x64/0xe8 [<c0393e54>] pci_host_probe+0x20/0xc8 [<c03bc6f4>] pci_host_common_probe+0x144/0x1e4 Fix this by giving the CAM ops the same ->add_bus/->remove_bus callbacks. Since pci_ecam_add_bus() and pci_ecam_remove_bus() are static to ecam.c, move the CAM ops definition there as pci_generic_cam_ops (mirroring pci_generic_ecam_ops) and export it for pci-host-generic.c to reference. [mani: removed timestamp from log]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8fe55ef23387ce3c7488375b1fd539420d7654bb 5e52eb0290f66ba0732956dcb1e365b5ca3c5108 git Not specified
CNA Linux Linux affected 8fe55ef23387ce3c7488375b1fd539420d7654bb baf9b0383ff770fdff123d3a832f3a99641d96dd git Not specified
CNA Linux Linux affected 8fe55ef23387ce3c7488375b1fd539420d7654bb 8d08713ec83a18526d1ed1fd5f0d2b901d103a10 git Not specified
CNA Linux Linux affected 8fe55ef23387ce3c7488375b1fd539420d7654bb 74456843f18ba7f3045974d7e8b88ab993152b8c git Not specified
CNA Linux Linux affected 8fe55ef23387ce3c7488375b1fd539420d7654bb 0c55707bd5d0d7670704cfd0dda933809b052f67 git Not specified
CNA Linux Linux affected 8fe55ef23387ce3c7488375b1fd539420d7654bb a199293f3038db8d31d47aa60f1e18272cd82354 git Not specified
CNA Linux Linux affected 8fe55ef23387ce3c7488375b1fd539420d7654bb 0916948026f623844acd08888f7cbedbf1c48d6b git Not specified
CNA Linux Linux affected 8fe55ef23387ce3c7488375b1fd539420d7654bb 008cb88edb41f3c7c8e0ed763ff9f26719830984 git Not specified
CNA Linux Linux affected 0b5877a1aeacdbf32b3bea91326592004ec7806f git Not specified
CNA Linux Linux affected a037ebbe72a4f98495b193112e2b2000e5e09eb5 git Not specified
CNA Linux Linux affected 5.12.19 5.13 semver Not specified
CNA Linux Linux affected 5.13.4 5.14 semver Not specified
CNA Linux Linux affected 5.14 Not specified
CNA Linux Linux unaffected 5.14 semver Not specified
CNA Linux Linux unaffected 5.15.218 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.185 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.154 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.106 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.47 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.11 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2.1 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8d08713ec83a18526d1ed1fd5f0d2b901d103a10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e52eb0290f66ba0732956dcb1e365b5ca3c5108 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0c55707bd5d0d7670704cfd0dda933809b052f67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a199293f3038db8d31d47aa60f1e18272cd82354 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/baf9b0383ff770fdff123d3a832f3a99641d96dd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0916948026f623844acd08888f7cbedbf1c48d6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/008cb88edb41f3c7c8e0ed763ff9f26719830984 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/74456843f18ba7f3045974d7e8b88ab993152b8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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