Input validation error in Linux kernel ipv4



| Updated: 2025-05-11
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-21766
CWE-ID CWE-20
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Linux kernel
Operating systems & Components / Operating system

Vendor Linux Foundation

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Input validation error

EUVDB-ID: #VU105089

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-2025-21766

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation within the out: kfree_skb_reason() and __ip_rt_update_pmtu() functions in net/ipv4/route.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 6.1 - 6.1.128

CPE2.3 External links

https://git.kernel.org/stable/c/139512191bd06f1b496117c76372b2ce372c9a41
https://git.kernel.org/stable/c/4583748b65dee4d61bd50a2214715b4237bc152a
https://git.kernel.org/stable/c/9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4
https://git.kernel.org/stable/c/a39f61d212d822b3062d7f70fa0588e50e55664e
https://git.kernel.org/stable/c/ea07480b23225942208f1b754fea1e7ec486d37e
https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.129


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.



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