#VU104765 Improper error handling in Linux kernel - CVE-2021-47635

Vulnerability identifier: #VU104765

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-2021-47635

CWE-ID: CWE-388

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 error handling within the ubifs_write_end(), do_writepage(), ubifs_invalidatepage(), ubifs_migrate_page(), ubifs_releasepage() and ubifs_vm_page_mkwrite() functions in fs/ubifs/file.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/3b67db8a6ca83e6ff90b756d3da0c966f61cd37b
https://git.kernel.org/stable/c/4f75bab98565afd4f905059c56ec4caba88a7eec
https://git.kernel.org/stable/c/5aaa2c0f0052b02c4a982993d4c5bb68fb7cbe22
https://git.kernel.org/stable/c/c34ae24a2590fee96a3a7735ba2fa6cc52306221
https://git.kernel.org/stable/c/fbeb2139eed65e929ce806c6468e6601ade01b1b

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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.