CVE-2021-47305
Linux Kernel DMA-Buf Fence Leaking Vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: dma-buf/sync_file: Don't leak fences on merge failure Each add_fence() call does a dma_fence_get() on the relevant fence. In the error path, we weren't calling dma_fence_put() so all those fences got leaked. Also, in the krealloc_array failure case, we weren't freeing the fences array. Instead, ensure that i and fences are always zero-initialized and dma_fence_put() all the fences and kfree(fences) on every error path.
INFO
Published Date :
May 21, 2024, 3:15 p.m.
Last Modified :
May 12, 2025, 8 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
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-2021-47305.
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-2021-47305 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47305 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.
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Initial Analysis by [email protected]
May. 12, 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-617 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.15 up to (excluding) 4.19.199 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.13.5 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.53 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.4.135 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.9 up to (excluding) 4.14.241 Added Reference Type CVE: https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435 Types: 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/0d514185ae792d3a1903c8e1a83899aa996705ce Added Reference https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27 Added Reference https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8 Added Reference https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902 Added Reference https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8 Added Reference https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435 -
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: dma-buf/sync_file: Don't leak fences on merge failure Each add_fence() call does a dma_fence_get() on the relevant fence. In the error path, we weren't calling dma_fence_put() so all those fences got leaked. Also, in the krealloc_array failure case, we weren't freeing the fences array. Instead, ensure that i and fences are always zero-initialized and dma_fence_put() all the fences and kfree(fences) on every error path. Added Reference kernel.org https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435 [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-2021-47305 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-2021-47305
weaknesses.