NULL pointer dereference in Linux kernel - CVE-2026-98504

Vulnerability identifier: #VU156805

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98504

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 through an early boot hang.

The vulnerability exists due to a null pointer dereference in the Linux kernel functions of_pci_prop_bus_range() and of_pci_prop_intr_map() when generating device tree properties for a PCI bridge without an allocated subordinate bus. A local user can exploit this condition during PCI initialization to cause an early boot hang.

The issue requires CONFIG_PCI_DYNAMIC_OF_NODES to be enabled.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (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-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
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/879c911f77b8a7862aa16079b04efc3fdc5d32ec
• https://git.kernel.org/stable/c/8805840aad73df7146778be243a196d48b4f6430
• https://git.kernel.org/stable/c/a6d97d10e49ae49026ae13af6c41634fce470a37
• https://git.kernel.org/stable/c/aee774588abd78f75952fd34c3fa461bc46b62c2
• https://git.kernel.org/stable/c/ccd32fa3489cbe86a0b281da4447b4c7eadb3518

• NULL pointer dereference in Linux kernel pci driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more