Bug 2360787 (CVE-2021-47669)

Summary: CVE-2021-47669 kernel: can: vxcan: vxcan_xmit: fix use after free bug
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-04-17 19:01:53 UTC 
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().
Comment 1 Avinash Hanwate 2025-04-18 03:43:29 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025041734-CVE-2021-47669-f268@gregkh/T