PT-2021-8194 · Linux+2 · Linux Kernel+2

Kees Cook · Published 2021-06-01 · Updated 2025-04-02 · CVE-2021-47348

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to a function in the Linux kernel's amdgpu driver, specifically the validate bksv() function in the hdcp1 execution.c module. This function is vulnerable to a buffer over-read, which could result in corrupted values if the trailing bytes are non-zero. The vulnerability can be exploited by a remote attacker to impact the confidentiality and availability of protected information. The vulnerability occurs because the code reads 8 bytes instead of the desired 5 bytes of the target field. To fix this, an appropriately sized and zero-initialized bounce buffer is used, and only 5 bytes are read before casting to u64.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

BDU:2024-10594

CVE-2021-47348

OPENSUSE-SU-2024_2185-1

SUSE-SU-2024:2010-1

SUSE-SU-2024:2185-1

Affected Products

Astra Linux

Linux Kernel

Suse

References · 423

• https://git.kernel.org/stable/c/44c7c901cb368a9f2493748f213b247b5872639f · Patch
• https://git.kernel.org/stable/c/3b2b93a485fb7a970bc8b5daef16f4cf579d172f · Patch
• https://git.kernel.org/stable/c/c5b518f4b98dbb2bc31b6a55e6aaa1e0e2948f2e · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47348 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2024:2010-1 · Vendor Advisory
• https://git.kernel.org/stable/c/06888d571b513cbfc0b41949948def6cb81021b2 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2024:2185-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-47348 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-47348 · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-10594 · Security Note
• https://ubuntu.com/security/CVE-2021-47348 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47348 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47348 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-47348 · Vendor Advisory
• https://suse.com/security/cve/CVE-2023-52433 · Note