NULL pointer dereference in Linux kernel - CVE-2026-98565

Vulnerability identifier: #VU156869

CSH Severity: Low

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98565

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local privileged user to cause a denial of service by triggering a kernel NULL pointer dereference.

The vulnerability exists due to a null pointer dereference in mt7530_remove() in drivers/net/dsa/mt7530-mdio.c when removing or unbinding an MT7621 or MT7531 switch device. A local privileged user can unload the driver module or trigger a sysfs unbind to cause regulator_disable() to operate on uninitialized core or I/O supply pointers and crash the kernel.

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/62c0e38b2e5034184d4502ce77bd178b29e59b83
• https://git.kernel.org/stable/c/aae2a1f1e3a0ac5eeb439262a2328a2a392413ac
• https://git.kernel.org/stable/c/bd172580e624bac00d83abd5c4320d2e14d853bc
• https://git.kernel.org/stable/c/c2cdef41e0b4d8ed23a5b41e6ad4e64594e055e4
• https://git.kernel.org/stable/c/e9a5298532780ecdd05c3220f3e1e3067b3537c3

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