---
id: CVE-2026-80917
title: |-
  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 e…
summary: |-
  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 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
---

## Overview

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]

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.