#VU104979 Out-of-bounds read in Linux kernel - CVE-2025-21743

Vulnerability identifier: #VU104979

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-2025-21743

CWE-ID: CWE-125

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 an out-of-bounds read error within the ipheth_rcvbulk_callback_ncm() function in drivers/net/usb/ipheth.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.13 - 6.13.2

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External links
https://git.kernel.org/stable/c/18bf6f5cce3172cb303c3f0551aa9443d5ed74f8
https://git.kernel.org/stable/c/c219427ed296f94bb4b91d08626776dc7719ee27
https://git.kernel.org/stable/c/d677e7dd59ad6837496f5a02d8e5d39824278dfd
https://git.kernel.org/stable/c/d824a964185910e317287f034c0a439c08b4fe49
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.13.3

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?