// For flags

CVE-2021-47305

dma-buf/sync_file: Don't leak fences on merge failure

Severity Score

5.5
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dma-buf/sync_file: no filtrar barreras en caso de falla de fusión. Cada llamada a add_fence() realiza un dma_fence_get() en la barrera relevante. En la ruta del error, no estábamos llamando a dma_fence_put() por lo que se filtraron todas esas barreras. Además, en el caso de falla de krealloc_array, no estábamos liberando la matriz de vallas. En su lugar, asegúrese de que i y las vallas estén siempre inicializadas en cero y dma_fence_put() todas las vallas y kfree(fences) en cada ruta de error.

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.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
Single
Confidentiality
None
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-21 CVE Reserved
  • 2024-05-21 CVE Published
  • 2024-12-19 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.9 < 4.14.241
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9 < 4.14.241"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.9 < 4.19.199
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9 < 4.19.199"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.9 < 5.4.135
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9 < 5.4.135"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.9 < 5.10.53
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9 < 5.10.53"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.9 < 5.13.5
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9 < 5.13.5"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.9 < 5.14
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9 < 5.14"
en
Affected