#VU104996 NULL pointer dereference in Linux kernel - CVE-2025-21775

Vulnerability identifier: #VU104996

Vulnerability risk: Low

CVSSv4.0: 4.3 [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/E:U/U:Clear]

CVE-ID: CVE-2025-21775

CWE-ID: CWE-476

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

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

The vulnerability exists due to NULL pointer dereference within the ctucan_err_interrupt() function in drivers/net/can/ctucanfd/ctucanfd_base.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: All versions

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External links
https://git.kernel.org/stable/c/84b9ac59978a6a4e0812d1c938fad97306272cef
https://git.kernel.org/stable/c/9bd24927e3eeb85642c7baa3b28be8bea6c2a078
https://git.kernel.org/stable/c/b0e592dd46a0a952b41c3bf6c963afdd6a42b526
https://git.kernel.org/stable/c/e505b83b9ee6aa0ae2f4395f573a66579ae403fb
https://git.kernel.org/stable/c/e7e2e2318b1f085044126ba553a4e619842fc36d

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.