#VU93159 Buffer overflow in Linux kernel - CVE-2021-47166

Vulnerability identifier: #VU93159

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-2021-47166

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 nfs_pageio_doio() and nfs_do_recoalesce() functions 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/e8b8418ce14ae66ee55179901edd12191ab06a9e
https://git.kernel.org/stable/c/b291baae24f876acd5a5dd57d0bb2bbac8a68b0c
https://git.kernel.org/stable/c/c757c1f1e65d89429db1409429436cf40d47c008
https://git.kernel.org/stable/c/40f139a6d50c232c0d1fd1c5e65a845c62db0ede
https://git.kernel.org/stable/c/785917316b25685c9b3a2a88f933139f2de75e33
https://git.kernel.org/stable/c/7087db95c0a06ab201b8ebfac6a7ec1e34257997
https://git.kernel.org/stable/c/2fe1cac336b55a1f79e603e9ce3552c3623e90eb
https://git.kernel.org/stable/c/0d0ea309357dea0d85a82815f02157eb7fcda39f

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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.