PT-2025-7966 · Linux+2 · Linux Kernel+2

Published 2021-12-06 · Updated 2025-05-21 · CVE-2021-47655

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A memory leak issue has been resolved in the Linux kernel. The issue occurred in the venus helper alloc dpb bufs() implementation, where an early return on an error path could prevent the release of earlier buffer allocations. The problem was fixed by moving the direct kfree() from the error checking of dma alloc attrs() to the common fail path, ensuring that allocations are released on all error paths in this function.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

BDU:2026-03241

CVE-2021-47655

Affected Products

Astra Linux

Linux Kernel

Red Os

References · 18

• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47655 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47655 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-47655 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47655 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-47655 · Security Note
• https://git.kernel.org/stable/c/5cedfe8aaf1875a5305897107b7f298db4260019 · Patch
• https://git.kernel.org/stable/c/5f89d05ba93df9c2cdfe493843f93288e55e99eb · Patch
• https://ubuntu.com/security/CVE-2021-47655 · Vendor Advisory
• https://git.kernel.org/stable/c/55bccafc246b2e64763a155ec454470c07a54a6e · Patch
• https://bdu.fstec.ru/vul/2026-03241 · Security Note
• https://git.kernel.org/stable/c/8403fdd775858a7bf04868d43daea0acbe49ddfc · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47655 · Security Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16.19 · Note
• https://git.kernel.org/linus/8403fdd775858a7bf04868d43daea0acbe49ddfc · Note
• https://twitter.com/CVEnew/status/1898276745134149798 · Twitter Post