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CVE-2022-49183: net/sched: act_ct: fix ref leak when switching zones

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-06-17

Description

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().

Affected products

• Linux kernel: from 5.10.103 before 5.11; from 5.15.26 before 5.15.33; from 5.16.12 through 5.16.19; from 5.17 through 5.17.2 — fixed in 5.11, 5.15.33

How to fix

Upgrade to a fixed version: Linux kernel 5.11, 5.15.33. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4bb42d73def9411e5cad885b9811987d72431df1
• https://git.kernel.org/stable/c/9222a08be539cbb7a8e0d46cbc7ab9e4db273eb8
• https://git.kernel.org/stable/c/b24793a37d91aacad7cb9893b226a7924a89636a
• https://git.kernel.org/stable/c/bcb74e132a76ce0502bb33d5b65533a4ed72d159
• https://git.kernel.org/stable/c/bcbf4e5c3b5b373cd61528392dd1ec8e9c0fd33d

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