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 :
Dec. 24, 2024, 4:31 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.0
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.
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.
-
Initial Analysis by [email protected]
Dec. 24, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE NIST CWE-367 Added CWE NIST CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 4.14.237 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.195 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.126 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.44 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.12.11 *cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* Changed Reference Type https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4 No Types Assigned https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4 Patch Changed Reference Type https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4 No Types Assigned https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4 Patch Changed Reference Type https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6 No Types Assigned https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6 Patch Changed Reference Type https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6 No Types Assigned https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6 Patch Changed Reference Type https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9 No Types Assigned https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9 Patch Changed Reference Type https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9 No Types Assigned https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9 Patch Changed Reference Type https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3 No Types Assigned https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3 Patch Changed Reference Type https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3 No Types Assigned https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3 Patch Changed Reference Type https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b No Types Assigned https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b Patch Changed Reference Type https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b No Types Assigned https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b Patch Changed Reference Type https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e No Types Assigned https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e Patch Changed Reference Type https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e No Types Assigned https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4 Added Reference https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6 Added Reference https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9 Added Reference https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3 Added Reference https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b Added Reference https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e -
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]
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.