CVE-2021-47669

can: vxcan: vxcan_xmit: fix use after free bug

HIGH

7.8

CVSS Score

Published: April 17, 2025 at 06:01 PM UTC

Updated: August 5, 2026 at 09:24 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.12 ≤ v < 4.14.2184.12 ≤ v < 4.19.1714.12 ≤ v < 5.10.114.12 ≤ v < 5.114.12 ≤ v < 5.4.934.15 ≤ v < 4.19.1714.20 ≤ v < 5.4.935.5 ≤ v < 5.10.115.11 rc1 5.11 rc2 5.11 rc3 5.11 rc4a8f820a380a2a06fc4fe1a54159067958f800929

Vendor states this is fixed in 6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105 (fixed)

Vendor states this is fixed in 75854cad5d80976f6ea0f0431f8cedd3bcc475cb (fixed)

Vendor states this is fixed in 9b820875a32a3443d67bfd368e93038354e98052 (fixed)

Vendor states this is fixed in a24476b37167816e6352ca1a2cf3769847774f70 (fixed)

Vendor states this is fixed in e771a874076115df8bff27d325edfd2340e4ec69 (fixed)

Vendor states this is fixed in 4.12 (unaffected)

Vendor states this is fixed in 4.14.218 (unaffected)

Vendor states this is fixed in 4.19.171 (unaffected)

Vendor states this is fixed in 5.10.11 (unaffected)

Vendor states this is fixed in 5.11 (unaffected)

Vendor states this is fixed in 5.4.93 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references