NULL pointer dereference in Linux kernel - CVE-2025-68368

Vulnerability identifier: #VU120470

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-2025-68368

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the mddev_clear_bitmap_ops(), mddev_init(), md_run() and __md_stop() functions in drivers/md/md.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-realtime-6.17 (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure (Ubuntu package)
linux-raspi (Ubuntu package)

Install update from vendor's repository.

linux (Ubuntu package) - addressed in versions 6.17.0-22.22, 6.17.0-1010.11
linux-aws (Ubuntu package) - addressed in versions 6.17.0-22.22~24.04.1, 6.17.0-1011.11, 6.17.0-1011.11~24.04.1, 6.17.0-1012.12, 6.17.0-1012.12~24.04.1
linux-realtime-6.17 (Ubuntu package) - update to 6.17.0-1010.11~24.04.1
linux-gcp (Ubuntu package) - addressed in versions 6.17.0-1012.12, 6.17.0-1012.12~24.04.1
linux-azure (Ubuntu package) - addressed in versions 6.17.0-1013.13, 6.17.0-1013.13~24.04.1, 6.17.0-1020.20
linux-raspi (Ubuntu package) - update to 6.17.0-1014.14

• https://git.kernel.org/stable/c/381a3ce1c0ffed647c9b913e142b099c7e9d5afc
• https://git.kernel.org/stable/c/9d37fe37dfa0833a8768740f0575e0ffd793cb4a

• NULL pointer dereference in Linux kernel md driver
• Ubuntu update for linux
• Ubuntu update for linux-realtime-6.17
• Ubuntu update for linux-gcp
• Ubuntu update for linux-aws
• Ubuntu update for linux-azure
• Ubuntu update for linux-raspi