GHSA-xf4c-frc6-wrrhHighCVSS 7.8

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: avoid...

Published
February 27, 2025
Last Modified
October 30, 2026

🔗 CVE IDs covered (1)

CVE-2022-49622 →

📋 Description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: avoid skb access on nf_stolen

When verdict is NF_STOLEN, the skb might have been freed.

When tracing is enabled, this can result in a use-after-free:

  1. access to skb->nf_trace
  2. access to skb->mark
  3. computation of trace id
  4. dump of packet payload

To avoid 1, keep a cached copy of skb->nf_trace in the trace state struct. Refresh this copy whenever verdict is != STOLEN.

Avoid 2 by skipping skb->mark access if verdict is STOLEN.

3 is avoided by precomputing the trace id.

Only dump the packet when verdict is not "STOLEN".

🔗 References (6)