What’s Vulnerable › Vulnerabilities

CVE-2026-74746: netfilter: flowtable: publish GC-visible tuple last

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-10-16

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: publish GC-visible tuple last nf_flow_table_iterate() only treats original-direction tuple nodes as owning entries. Publishing the original node first lets GC observe and free a flow while flow_offload_add() is still inserting the reply node. Publish the reply node first and the original node last so GC never sees a partially installed flow. KASAN can trigger slab-use-after-free read and write reports in the flowtable/rhashtable path (rht_deferred_worker, jhash, flow_offload_del, flow_offload_lookup, etc.).

Affected products

• Linux kernel: 4.16 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0a00254585827f1695aa2700114af622ea754cfa
• https://git.kernel.org/stable/c/2014ac62df9d45bb9a004a043e85df7be09ed780
• https://git.kernel.org/stable/c/211ee5d998d92a7d548811939c65942d06c146e4
• https://git.kernel.org/stable/c/972fdf7c4f5c282a239c88fea614b056c33dc025
• https://git.kernel.org/stable/c/be345dcbddb4643a54252b954af974b16eda8f91
• https://git.kernel.org/stable/c/d16b71231e65cb05daea2b45701fcf09cef041e7
• https://git.kernel.org/stable/c/d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2
• https://git.kernel.org/stable/c/d9d3050a70efe217e73a0751e55fdae6a7092620

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