CVE-2026-74746

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxac2a66665e231847cab11b8c8e844ce43207dd2e < 0a00254585827f1695aa2700114af622ea754cfaaffected
LinuxLinuxac2a66665e231847cab11b8c8e844ce43207dd2e < be345dcbddb4643a54252b954af974b16eda8f91affected
LinuxLinuxac2a66665e231847cab11b8c8e844ce43207dd2e < 211ee5d998d92a7d548811939c65942d06c146e4affected
LinuxLinuxac2a66665e231847cab11b8c8e844ce43207dd2e < d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2affected
LinuxLinuxac2a66665e231847cab11b8c8e844ce43207dd2e < 972fdf7c4f5c282a239c88fea614b056c33dc025affected
LinuxLinuxac2a66665e231847cab11b8c8e844ce43207dd2e < d9d3050a70efe217e73a0751e55fdae6a7092620affected
LinuxLinuxac2a66665e231847cab11b8c8e844ce43207dd2e < d16b71231e65cb05daea2b45701fcf09cef041e7affected
LinuxLinuxac2a66665e231847cab11b8c8e844ce43207dd2e < 2014ac62df9d45bb9a004a043e85df7be09ed780affected
LinuxLinux4.16affected
LinuxLinux0 < 4.16unaffected
LinuxLinux5.10.266 <= 5.10.*unaffected
LinuxLinux5.15.217 <= 5.15.*unaffected
LinuxLinux6.1.184 <= 6.1.*unaffected
LinuxLinux6.6.153 <= 6.6.*unaffected
LinuxLinux6.12.105 <= 6.12.*unaffected
LinuxLinux6.18.46 <= 6.18.*unaffected
LinuxLinux7.1.10 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References