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CVE-2021-47649
Linux kernel UDMA Buffer Zero Ptr Pointer Vulnerability
Description

In the Linux kernel, the following vulnerability has been resolved: udmabuf: validate ubuf->pagecount Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The problem was in ubuf->pages == ZERO_PTR. ubuf->pagecount is calculated from arguments passed from user-space. If user creates udmabuf with list.size == 0 then ubuf->pagecount will be also equal to zero; it causes kmalloc_array() to return ZERO_PTR. Fix it by validating ubuf->pagecount before passing it to kmalloc_array().

INFO

Published Date :

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

Last Modified :

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

Remotely Exploit :

No

Source :

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

The following products are affected by CVE-2021-47649 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
Solution
To address the vulnerability, update the Linux kernel packages to the latest version.
  • Update the Linux kernel packages.
  • Reboot the system after updating.
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-2021-47649.

URL Resource
https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882
https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9
https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137e
https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9
https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202
https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-47649 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-2021-47649 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-2021-47649 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-2021-47649 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.

  • 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: udmabuf: validate ubuf->pagecount Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The problem was in ubuf->pages == ZERO_PTR. ubuf->pagecount is calculated from arguments passed from user-space. If user creates udmabuf with list.size == 0 then ubuf->pagecount will be also equal to zero; it causes kmalloc_array() to return ZERO_PTR. Fix it by validating ubuf->pagecount before passing it to kmalloc_array().
    Added Reference https://git.kernel.org/stable/c/2b6dd600dd72573c23ea180b5b0b2f1813405882
    Added Reference https://git.kernel.org/stable/c/5d50f851dd307c07ca5591297093f19967c834a9
    Added Reference https://git.kernel.org/stable/c/811b667cefbea9cb7511a874b169d6a92907137e
    Added Reference https://git.kernel.org/stable/c/9e9b4a269f84d3230f2af84ff42322db676440d9
    Added Reference https://git.kernel.org/stable/c/a3728d32fc61eb0fe283cb8ff60b2c8f751e2202
    Added Reference https://git.kernel.org/stable/c/b267a8118c2b171bf7d67b90ed64154eeab9fae0
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
No CVSS metrics available for this vulnerability.