CVE-2026-74746
Published Aug 26, 2026
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.).
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References
Other 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
Frequently Asked Questions
What is CVE-2026-74746? +
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.).
How do I check if I'm vulnerable to CVE-2026-74746? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.