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5.5
MEDIUM CVSS 3.1
CVE-2021-47655
"Venus Media Linux Kernel Memory Leak"
Description

In the Linux kernel, the following vulnerability has been resolved: media: venus: vdec: fixed possible memory leak issue The venus_helper_alloc_dpb_bufs() implementation allows an early return on an error path when checking the id from ida_alloc_min() which would not release the earlier buffer allocation. Move the direct kfree() from the error checking of dma_alloc_attrs() to the common fail path to ensure that allocations are released on all error paths in this function. Addresses-Coverity: 1494120 ("Resource leak")

INFO

Published Date :

Feb. 26, 2025, 6:37 a.m.

Last Modified :

March 18, 2025, 6:50 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2021-47655 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Update the Linux kernel to a version that resolves the memory leak in venus_helper_alloc_dpb_bufs.
  • Update the Linux kernel to the latest stable version.
  • Apply the specific patch that fixes this memory leak.
  • Rebuild and deploy the kernel with the fix.
  • Test the system for memory leak stability.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-47655.

URL Resource
https://git.kernel.org/stable/c/55bccafc246b2e64763a155ec454470c07a54a6e Patch
https://git.kernel.org/stable/c/5cedfe8aaf1875a5305897107b7f298db4260019 Patch
https://git.kernel.org/stable/c/5f89d05ba93df9c2cdfe493843f93288e55e99eb Patch
https://git.kernel.org/stable/c/8403fdd775858a7bf04868d43daea0acbe49ddfc Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-47655 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-47655 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-47655 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-47655 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Mar. 18, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-401
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.17 up to (excluding) 5.17.2 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 5.16.19
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/55bccafc246b2e64763a155ec454470c07a54a6e Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/5cedfe8aaf1875a5305897107b7f298db4260019 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/5f89d05ba93df9c2cdfe493843f93288e55e99eb Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/8403fdd775858a7bf04868d43daea0acbe49ddfc Types: Patch
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 26, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: media: venus: vdec: fixed possible memory leak issue The venus_helper_alloc_dpb_bufs() implementation allows an early return on an error path when checking the id from ida_alloc_min() which would not release the earlier buffer allocation. Move the direct kfree() from the error checking of dma_alloc_attrs() to the common fail path to ensure that allocations are released on all error paths in this function. Addresses-Coverity: 1494120 ("Resource leak")
    Added Reference https://git.kernel.org/stable/c/55bccafc246b2e64763a155ec454470c07a54a6e
    Added Reference https://git.kernel.org/stable/c/5cedfe8aaf1875a5305897107b7f298db4260019
    Added Reference https://git.kernel.org/stable/c/5f89d05ba93df9c2cdfe493843f93288e55e99eb
    Added Reference https://git.kernel.org/stable/c/8403fdd775858a7bf04868d43daea0acbe49ddfc
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 5.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact