#VU51551 Integer overflow in Linux kernel - CVE-2021-3428

Vulnerability identifier: #VU51551

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-2021-3428

CWE-ID: CWE-190

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 integer overflow in fs/ext4/extents.c in ext4_es_cache_extent() function, if an extent tree is corrupted in a crafted ext4 filesystem. A local user can mount a specially crafted filesystem and perform a denial of service (DoS) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Linux kernel: All versions

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External links
https://seclists.org/oss-sec/2021/q1/212
https://bugzilla.redhat.com/show_bug.cgi?id=1936786
https://bugzilla.suse.com/show_bug.cgi?id=1173485

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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.