#VU93604 Buffer overflow in Linux kernel - CVE-2021-47376

Vulnerability identifier: #VU93604

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-2021-47376

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 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: All versions

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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

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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.