NULL pointer dereference in Linux kernel - CVE-2026-80917

Vulnerability identifier: #VU148844

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-80917

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a null pointer dereference in the generic PCI host CAM operations when enumerating PCI buses on 32-bit CAM systems. A local user can trigger PCI configuration-space access during bus enumeration to cause a denial of service.

Only 32-bit hosts using the "pci-host-cam-generic" compatible are affected.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-kvm (Ubuntu package)
linux-gcp (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure (Ubuntu package)
linux-oracle (Ubuntu package)
linux-lowlatency (Ubuntu package)
linux-gke (Ubuntu package)
linux-aws-5.15 (Ubuntu package)
linux-lowlatency-hwe-5.15 (Ubuntu package)
linux-hwe-5.15 (Ubuntu package)
linux-fips (Ubuntu package)
linux-azure-5.15 (Ubuntu package)
linux-azure-fde-5.15 (Ubuntu package)
linux-ibm-5.15 (Ubuntu package)
linux-intel-iotg (Ubuntu package)
linux-realtime (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-ibm (Ubuntu package)
linux-intel-iotg-5.15 (Ubuntu package)
linux-oracle-5.15 (Ubuntu package)
linux-gcp-5.15 (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-intel-iot-realtime (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux-azure-fde (Ubuntu package) - update to 5.15.0-1124.133
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

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

• NULL pointer dereference in Linux kernel generic PCI host CAM operations in drivers/pci/controller/pci-host-generic.c
• Ubuntu update for linux-azure-fde
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more