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CVE-2021-47655: media: venus: vdec: fixed possible memory leak issue

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: media: venus: vdec: fixed possible memory leak issue The venus_helper_alloc_dpb_bufs() implementation allows an early return on an error path when checking the id from ida_alloc_min() which would not release the earlier buffer allocation. Move the direct kfree() from the error checking of dma_alloc_attrs() to the common fail path to ensure that allocations are released on all error paths in this function. Addresses-Coverity: 1494120 ("Resource leak")

Affected products

• Linux kernel: from 5.16 before 5.16.19; from 5.17 before 5.17.2 — fixed in 5.16.19, 5.17.2

How to fix

Upgrade to a fixed version: Linux kernel 5.16.19, 5.17.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/55bccafc246b2e64763a155ec454470c07a54a6e
• https://git.kernel.org/stable/c/5cedfe8aaf1875a5305897107b7f298db4260019
• https://git.kernel.org/stable/c/5f89d05ba93df9c2cdfe493843f93288e55e99eb
• https://git.kernel.org/stable/c/8403fdd775858a7bf04868d43daea0acbe49ddfc

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