PT-2025-17218 · Linux+2 · Linux Kernel+2

Published 2025-04-17 · Updated 2025-05-21 · CVE-2021-47669

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

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

Description A use after free bug has been identified in the Linux kernel, specifically in the vxcan xmit function. The issue arises after calling netif rx ni(skb), where dereferencing skb becomes unsafe. This is particularly problematic because the canfd frame cfd, which shares memory with skb, is accessed after the netif rx ni() call.

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

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2021-47669

OPENSUSE-SU-2025_01633-1

SUSE-SU-2025:01600-1

SUSE-SU-2025:01633-1

SUSE-SU-2025:1574-1

SUSE-SU-2025_01600-1

SUSE-SU-2025_01633-1

Affected Products

Astra Linux

Linux Kernel

Suse

References · 256

• https://security-tracker.debian.org/tracker/CVE-2021-47669 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:01633-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-47669 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2025:1574-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-47669 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47669 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-47669 · Vendor Advisory
• https://git.kernel.org/stable/c/a24476b37167816e6352ca1a2cf3769847774f70 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47669 · Security Note
• https://git.kernel.org/stable/c/e771a874076115df8bff27d325edfd2340e4ec69 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47669 · Vendor Advisory
• https://git.kernel.org/stable/c/6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105 · Patch
• https://git.kernel.org/stable/c/9b820875a32a3443d67bfd368e93038354e98052 · Patch
• https://git.kernel.org/stable/c/75854cad5d80976f6ea0f0431f8cedd3bcc475cb · Patch
• https://osv.dev/vulnerability/SUSE-SU-2025:01600-1 · Vendor Advisory