CVE-2021-47348: linux kernel Buffer Overflow — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Avoid HDCP over-read and corruption Instead of reading the desired 5 bytes of the actual target field, the code was reading 8. This could result in a corrupted value if the trailing 3 bytes were non-zero, so instead use an appropriately sized and zero-initialized bounce buffer, and read only 5 bytes before casting to u64.

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CVSS v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Weakness Type (CWE)

CWE-119 Buffer Overflow

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 5.10.51
linux	linux_kernel	5.11 — 5.12.18
linux	linux_kernel	5.13 — 5.13.3

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2021-47348? +

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Avoid HDCP over-read and corruption Instead of reading the desired 5 bytes of the actual target field, the code was reading 8. This could result in a corrupted value if the trailing 3 bytes were non-zero, so instead use an appropriately sized and zero-initialized bounce buffer, and read only 5 bytes before casting to u64. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2021-47348? +

CVE-2021-47348 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2021-47348? +

CVE-2021-47348 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2021-47348? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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