#VU105056 Buffer overflow in Linux kernel - CVE-2025-21735

Vulnerability identifier: #VU105056

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-21735

CWE-ID: CWE-119

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 escalate privileges on the system.

The vulnerability exists due to memory corruption within the nci_hci_create_pipe() function in net/nfc/nci/hci.c. A local user can escalate privileges on the system.

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/110b43ef05342d5a11284cc8b21582b698b4ef1c
https://git.kernel.org/stable/c/172cdfc3a5ea20289c58fb73dadc6fd4a8784a4e
https://git.kernel.org/stable/c/2ae4bade5a64d126bd18eb66bd419005c5550218
https://git.kernel.org/stable/c/59c7ed20217c0939862fbf8145bc49d5b3a13f4f
https://git.kernel.org/stable/c/d5a461c315e5ff92657f84d8ba50caa5abf5c22a

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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.