#VU93691 Input validation error in Linux kernel - CVE-2021-47167

Vulnerability identifier: #VU93691

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-2021-47167

CWE-ID: CWE-20

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 improper input validation within the nfs_pageio_do_add_request() function in fs/nfs/pagelist.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/1fc5f4eb9d31268ac3ce152d74ad5501ad24ca3e
https://git.kernel.org/stable/c/ee21cd3aa8548e0cbc8c67a80b62113aedd2d101
https://git.kernel.org/stable/c/15ac6f14787649e8ebd75c142e2c5d2a243c8490
https://git.kernel.org/stable/c/56517ab958b7c11030e626250c00b9b1a24b41eb

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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.