Buffer overflow in Linux kernel modules hdcp driver

1) Buffer overflow

EUVDB-ID: #VU93147

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-2021-47348

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory corruption within the validate_bksv() function in drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_execution.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

CPE2.3

• cpe:2.3:o:linux_foundation:linux_kernel:*:*:*:*:*:*:*:*

External links

https://git.kernel.org/stable/c/c5b518f4b98dbb2bc31b6a55e6aaa1e0e2948f2e
https://git.kernel.org/stable/c/44c7c901cb368a9f2493748f213b247b5872639f
https://git.kernel.org/stable/c/3b2b93a485fb7a970bc8b5daef16f4cf579d172f
https://git.kernel.org/stable/c/06888d571b513cbfc0b41949948def6cb81021b2

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.