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5.5
MEDIUM CVSS 3.1
CVE-2021-47657
Virtio GPU NULL Pointer Dereference in Linux Kernel
Description

In the Linux kernel, the following vulnerability has been resolved: drm/virtio: Ensure that objs is not NULL in virtio_gpu_array_put_free() If virtio_gpu_object_shmem_init() fails (e.g. due to fault injection, as it happened in the bug report by syzbot), virtio_gpu_array_put_free() could be called with objs equal to NULL. Ensure that objs is not NULL in virtio_gpu_array_put_free(), or otherwise return from the function.

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-2021-47657 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 includes the fix for the virtio_gpu_array_put_free function.
  • Update the Linux kernel.
  • Ensure objs is not NULL in virtio_gpu_array_put_free.
  • Return from the function if objs is NULL.
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-2021-47657.

URL Resource
https://git.kernel.org/stable/c/6b79f96f4a23846516e5e6e4dd37fc06f43a60dd Patch
https://git.kernel.org/stable/c/abc9ad36df16e27ac1c665085157f1a082d39bac Patch
https://git.kernel.org/stable/c/ac92b474eeeed75b8660374ba1d129a121c09da8 Patch
https://git.kernel.org/stable/c/b094fece3810c71ceee6f0921676cb65d4e68c5a 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-2021-47657 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-2021-47657 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-2021-47657 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-2021-47657 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-476
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.17 up to (excluding) 5.17.1 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 5.16.18 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11.20 up to (excluding) 5.12 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12.3 up to (excluding) 5.15.32
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/6b79f96f4a23846516e5e6e4dd37fc06f43a60dd Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/abc9ad36df16e27ac1c665085157f1a082d39bac Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/ac92b474eeeed75b8660374ba1d129a121c09da8 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/b094fece3810c71ceee6f0921676cb65d4e68c5a 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: drm/virtio: Ensure that objs is not NULL in virtio_gpu_array_put_free() If virtio_gpu_object_shmem_init() fails (e.g. due to fault injection, as it happened in the bug report by syzbot), virtio_gpu_array_put_free() could be called with objs equal to NULL. Ensure that objs is not NULL in virtio_gpu_array_put_free(), or otherwise return from the function.
    Added Reference https://git.kernel.org/stable/c/6b79f96f4a23846516e5e6e4dd37fc06f43a60dd
    Added Reference https://git.kernel.org/stable/c/abc9ad36df16e27ac1c665085157f1a082d39bac
    Added Reference https://git.kernel.org/stable/c/ac92b474eeeed75b8660374ba1d129a121c09da8
    Added Reference https://git.kernel.org/stable/c/b094fece3810c71ceee6f0921676cb65d4e68c5a
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