by Kastro CVE-2026-74746
Linux Linux — netfilter: flowtable: publish GC-visible tuple last
Description · from the CVE record
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
ProductAffectedFixed inSource
Linuxac2a66665e231847cab11b8c8e844ce43207dd2e – < 0a00254585827f1695aa2700114af622ea754cfa0a00254585827f1695aa2700114af622ea754cfaCNA
Linuxac2a66665e231847cab11b8c8e844ce43207dd2e – < be345dcbddb4643a54252b954af974b16eda8f91be345dcbddb4643a54252b954af974b16eda8f91CNA
Linuxac2a66665e231847cab11b8c8e844ce43207dd2e – < 211ee5d998d92a7d548811939c65942d06c146e4211ee5d998d92a7d548811939c65942d06c146e4CNA
Linuxac2a66665e231847cab11b8c8e844ce43207dd2e – < d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2CNA
Linuxac2a66665e231847cab11b8c8e844ce43207dd2e – < 972fdf7c4f5c282a239c88fea614b056c33dc025972fdf7c4f5c282a239c88fea614b056c33dc025CNA
Linuxac2a66665e231847cab11b8c8e844ce43207dd2e – < d9d3050a70efe217e73a0751e55fdae6a7092620d9d3050a70efe217e73a0751e55fdae6a7092620CNA
Linuxac2a66665e231847cab11b8c8e844ce43207dd2e – < d16b71231e65cb05daea2b45701fcf09cef041e7d16b71231e65cb05daea2b45701fcf09cef041e7CNA
Linuxac2a66665e231847cab11b8c8e844ce43207dd2e – < 2014ac62df9d45bb9a004a043e85df7be09ed7802014ac62df9d45bb9a004a043e85df7be09ed780CNA
Linux4.16–CNA
Scores by source
Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total