Integer underflow in Linux kernel ipv6

Published: 2024-06-20 | Updated: 2025-05-13

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2021-47588
CWE-ID	CWE-191
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) Integer underflow

EUVDB-ID: #VU92374

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-2021-47588

CWE-ID: CWE-191 - Integer underflow

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to integer underflow within the sit_init_net() function in net/ipv6/sit.c. A local user can execute arbitrary code.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 4.14 - 5.16 rc8

CPE2.3

External links

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.