0.0
NA
CVE-2021-47280
Linux Kernel Drupal Use-After-Free Vulnerability
Description

In the Linux kernel, the following vulnerability has been resolved: drm: Fix use-after-free read in drm_getunique() There is a time-of-check-to-time-of-use error in drm_getunique() due to retrieving file_priv->master prior to locking the device's master mutex. An example can be seen in the crash report of the use-after-free error found by Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 In the report, the master pointer was used after being freed. This is because another process had acquired the device's master mutex in drm_setmaster_ioctl(), then overwrote fpriv->master in drm_new_set_master(). The old value of fpriv->master was subsequently freed before the mutex was unlocked. To fix this, we lock the device's master mutex before retrieving the pointer from from fpriv->master. This patch passes the Syzbot reproducer test.

INFO

Published Date :

May 21, 2024, 3:15 p.m.

Last Modified :

May 21, 2024, 4:54 p.m.

Source :

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

Remotely Exploitable :

No

Impact Score :

Exploitability Score :

Affected Products

The following products are affected by CVE-2021-47280 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
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-2021-47280.

URL Resource
https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4
https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6
https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9
https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3
https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b
https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e

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-2021-47280 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-47280 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.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 28, 2024

    Action Type Old Value New Value
  • CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 21, 2024

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: drm: Fix use-after-free read in drm_getunique() There is a time-of-check-to-time-of-use error in drm_getunique() due to retrieving file_priv->master prior to locking the device's master mutex. An example can be seen in the crash report of the use-after-free error found by Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 In the report, the master pointer was used after being freed. This is because another process had acquired the device's master mutex in drm_setmaster_ioctl(), then overwrote fpriv->master in drm_new_set_master(). The old value of fpriv->master was subsequently freed before the mutex was unlocked. To fix this, we lock the device's master mutex before retrieving the pointer from from fpriv->master. This patch passes the Syzbot reproducer test.
    Added Reference kernel.org https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b [No types assigned]
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.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-47280 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-2021-47280 weaknesses.

NONE - Vulnerability Scoring System
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