What’s Vulnerable › Vulnerabilities

CVE-2021-47669: can: vxcan: vxcan_xmit: fix use after free bug

• Severity: high (CVSS 7.8 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: 2025-04-17 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: can: vxcan: vxcan_xmit: fix use after free bug After calling netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the canfd_frame cfd which aliases skb memory is accessed after the netif_rx_ni().

Affected products

• Linux kernel: from 4.12 before 4.14.218; from 4.15 before 4.19.171; from 4.20 before 5.4.93; from 5.5 before 5.10.11; 5.11-rc1, 5.11-rc2, 5.11-rc3, 5.11-rc4 — fixed in 4.14.218, 4.19.171, 5.10.11, 5.4.93

How to fix

Upgrade to a fixed version: Linux kernel 4.14.218, 4.19.171, 5.10.11, 5.4.93. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105
• https://git.kernel.org/stable/c/75854cad5d80976f6ea0f0431f8cedd3bcc475cb
• https://git.kernel.org/stable/c/9b820875a32a3443d67bfd368e93038354e98052
• https://git.kernel.org/stable/c/a24476b37167816e6352ca1a2cf3769847774f70
• https://git.kernel.org/stable/c/e771a874076115df8bff27d325edfd2340e4ec69

Get alerted when CVE-2021-47669 or the next vulnerability affects your stack