Buffer overflow in Linux kernel bpf



| Updated: 2025-05-13
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-47376
CWE-ID CWE-119
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) Buffer overflow

EUVDB-ID: #VU93604

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-2021-47376

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to memory corruption within the check_btf_line() function in kernel/bpf/verifier.c. A local user can perform a denial of service (DoS) attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Linux kernel: 5.4 - 5.15 rc7

CPE2.3 External links

https://git.kernel.org/stable/c/93937596e0652d50973f9dc944fea1694ac8cdfd
https://git.kernel.org/stable/c/6345a0bee80139ea00a341c4202ebfd1534b5eb0
https://git.kernel.org/stable/c/b5fe7cdfee5901ce5513c30e554d51536e003bde
https://git.kernel.org/stable/c/0e6491b559704da720f6da09dd0a52c4df44c514
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.70
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.9
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15
https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.150


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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