#VU27309 Stack-based buffer overflow in Linux kernel - CVE-2020-10942

Vulnerability identifier: #VU27309

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-2020-10942

CWE-ID: CWE-121

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 a boundary error within the get_raw_socket() function in drivers/vhost/net.c due to lack of validation of the sk_family field. A local user can perform a specially crafted system call, trigger stack overflow and crash the kernel.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Linux kernel: 5.5.1 - 5.5.7

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External links
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.8
https://git.kernel.org/linus/42d84c8490f9f0931786f1623191fcab397c3d64
https://lkml.org/lkml/2020/2/15/125
https://security.netapp.com/advisory/ntap-20200403-0003/

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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.