NULL pointer dereference in Linux kernel - CVE-2026-74379

Vulnerability identifier: #VU142784

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-2026-74379

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 dev_dax_kmem_remove() when removing dax kmem ranges after partial success during probing. A local user can trigger removal of a device with ranges whose resources were never added to cause a denial of service.

The issue occurs when dev_dax_kmem_probe() partially succeeds and later probe failures leave some range resources unset while removal still iterates over all ranges.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• https://git.kernel.org/stable/c/30ea97affbcce236c57287c82dc6ef7a29c63b76
• https://git.kernel.org/stable/c/598ed7393a639c7547b28ff3e14db9f1ac37c132
• https://git.kernel.org/stable/c/5d3139abb9d1671fa5e42c3d6d8cb3b05479c5bb
• https://git.kernel.org/stable/c/799e54c510a03a65a57627018a817838d72f35bd
• https://git.kernel.org/stable/c/8aa442cfce79e2d69e72fc8e0c0864ac2971149d
• https://git.kernel.org/stable/c/d47b0b8a69a13e06afafa54723f3e8c99b0c788f
• https://git.kernel.org/stable/c/ef4fc53898bd6c4d0119cc6d419ebef7f2560f31

• NULL pointer dereference in Linux kernel dax driver
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0