In 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]

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
8fe55ef23387ce3c7488375b1fd539420d7654bb affected < 5e52eb0290f66ba0732956dcb1e365b5ca3c5108
8fe55ef23387ce3c7488375b1fd539420d7654bb affected < baf9b0383ff770fdff123d3a832f3a99641d96dd
8fe55ef23387ce3c7488375b1fd539420d7654bb affected < 8d08713ec83a18526d1ed1fd5f0d2b901d103a10
8fe55ef23387ce3c7488375b1fd539420d7654bb affected < 74456843f18ba7f3045974d7e8b88ab993152b8c
8fe55ef23387ce3c7488375b1fd539420d7654bb affected < 0c55707bd5d0d7670704cfd0dda933809b052f67
8fe55ef23387ce3c7488375b1fd539420d7654bb affected < a199293f3038db8d31d47aa60f1e18272cd82354
8fe55ef23387ce3c7488375b1fd539420d7654bb affected < 0916948026f623844acd08888f7cbedbf1c48d6b
8fe55ef23387ce3c7488375b1fd539420d7654bb affected < 008cb88edb41f3c7c8e0ed763ff9f26719830984
0b5877a1aeacdbf32b3bea91326592004ec7806f affected —
a037ebbe72a4f98495b193112e2b2000e5e09eb5 affected —
5.12.19 affected < 5.13
5.13.4 affected < 5.14
Linux Linux affected
Version Status Constraints
5.14 affected —
0 unaffected < 5.14
5.15.218 unaffected ≤ 5.15.*
6.1.185 unaffected ≤ 6.1.*
6.6.154 unaffected ≤ 6.6.*
6.12.106 unaffected ≤ 6.12.*
6.18.47 unaffected ≤ 6.18.*
7.1.11 unaffected ≤ 7.1.*
7.2.1 unaffected ≤ 7.2.*
7.3-rc1 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/008cb88edb41f3c7c8e0ed763ff9f26719830984 cve-icon cve-icon
https://git.kernel.org/stable/c/0916948026f623844acd08888f7cbedbf1c48d6b cve-icon cve-icon
https://git.kernel.org/stable/c/0c55707bd5d0d7670704cfd0dda933809b052f67 cve-icon cve-icon
https://git.kernel.org/stable/c/5e52eb0290f66ba0732956dcb1e365b5ca3c5108 cve-icon cve-icon
https://git.kernel.org/stable/c/74456843f18ba7f3045974d7e8b88ab993152b8c cve-icon cve-icon
https://git.kernel.org/stable/c/8d08713ec83a18526d1ed1fd5f0d2b901d103a10 cve-icon cve-icon
https://git.kernel.org/stable/c/a199293f3038db8d31d47aa60f1e18272cd82354 cve-icon cve-icon
https://git.kernel.org/stable/c/baf9b0383ff770fdff123d3a832f3a99641d96dd cve-icon cve-icon
History

Wed, 09 Sep 2026 18:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Wed, 09 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description In 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]
Title PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-09-09T16:13:15.202Z

Reserved: 2026-08-26T14:34:25.801Z

Link: CVE-2026-80917

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-09T17:17:46.680

Modified: 2026-09-09T17:17:46.680

Link: CVE-2026-80917

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-09T18:00:08Z

Weaknesses