Vulnerability identifier: #VU93162

Vulnerability risk: Low

CVSSv3.1: 4.8 [AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-47117

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 ext4_split_extent_at() function in fs/ext4/extents.c. A local user can perform a denial of service (DoS) attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Linux kernel:

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External links
http://git.kernel.org/stable/c/e33bafad30d34cfa5e9787cb099cab05e2677fcb
http://git.kernel.org/stable/c/5b3a9a2be59478b013a430ac57b0f3d65471b071
http://git.kernel.org/stable/c/d8116743ef5432336289256b2f7c117299213eb9
http://git.kernel.org/stable/c/569496aa3776eea1ff0d49d0174ac1b7e861e107
http://git.kernel.org/stable/c/920697b004e49cb026e2e15fe91be065bf0741b7
http://git.kernel.org/stable/c/d3b668b96ad3192c0581a248ae2f596cd054792a
http://git.kernel.org/stable/c/48105dc98c9ca35af418746277b087cb2bc6df7c
http://git.kernel.org/stable/c/082cd4ec240b8734a82a89ffb890216ac98fec68

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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.