CVE-2021-47305: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 4.9, before 4.14.241 (fixed in 4.14.241); from 4.15, before 4.19.199 (fixed in 4.19.199); from 4.20, before 5.4.135 (fixed in 5.4.135); from 5.5, before 5.10.53 (fixed in 5.10.53); from 5.11, before 5.13.5 (fixed in 5.13.5); version 5.14 only

Published 2024-05-21. Last modified 2026-06-17.