Bug 2347743 (CVE-2022-49183)

Summary: CVE-2022-49183 kernel: net/sched: act_ct: fix ref leak when switching zones
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:05:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net/sched: act_ct: fix ref leak when switching zones

When switching zones or network namespaces without doing a ct clear in
between, it is now leaking a reference to the old ct entry. That's
because tcf_ct_skb_nfct_cached() returns false and
tcf_ct_flow_table_lookup() may simply overwrite it.

The fix is to, as the ct entry is not reusable, free it already at
tcf_ct_skb_nfct_cached().
Comment 1 Avinash Hanwate 2025-02-26 19:59:23 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022614-CVE-2022-49183-1962@gregkh/T