CVE-2026-74746

netfilter: flowtable: publish GC-visible tuple last

State: Published
Severity: 9.8 Critical
Published: Aug 26, 2026
Updated: Oct 16, 2026
Reserved: Aug 15, 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.).

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ac2a66665e231847cab11b8c8e844ce43207dd2e to before 0a00254585827f1695aa2700114af622ea754cfaAffected ac2a66665e231847cab11b8c8e844ce43207dd2e to before be345dcbddb4643a54252b954af974b16eda8f91Affected ac2a66665e231847cab11b8c8e844ce43207dd2e to before 211ee5d998d92a7d548811939c65942d06c146e4Affected ac2a66665e231847cab11b8c8e844ce43207dd2e to before d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2Affected ac2a66665e231847cab11b8c8e844ce43207dd2e to before 972fdf7c4f5c282a239c88fea614b056c33dc025Affected ac2a66665e231847cab11b8c8e844ce43207dd2e to before d9d3050a70efe217e73a0751e55fdae6a7092620Affected ac2a66665e231847cab11b8c8e844ce43207dd2e to before d16b71231e65cb05daea2b45701fcf09cef041e7Affected ac2a66665e231847cab11b8c8e844ce43207dd2e to before 2014ac62df9d45bb9a004a043e85df7be09ed780Affected
LinuxLinux	4.16Affected before 4.16Not affected 5.10.266 through 5.10.Not affected 5.15.217 through 5.15.Not affected 6.1.184 through 6.1.Not affected 6.6.153 through 6.6.Not affected 6.12.105 through 6.12.Not affected 6.18.46 through 6.18.Not affected 7.1.10 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

ac2a66665e231847cab11b8c8e844ce43207dd2e to before 0a00254585827f1695aa2700114af622ea754cfaAffected
ac2a66665e231847cab11b8c8e844ce43207dd2e to before be345dcbddb4643a54252b954af974b16eda8f91Affected
ac2a66665e231847cab11b8c8e844ce43207dd2e to before 211ee5d998d92a7d548811939c65942d06c146e4Affected
ac2a66665e231847cab11b8c8e844ce43207dd2e to before d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2Affected
ac2a66665e231847cab11b8c8e844ce43207dd2e to before 972fdf7c4f5c282a239c88fea614b056c33dc025Affected
ac2a66665e231847cab11b8c8e844ce43207dd2e to before d9d3050a70efe217e73a0751e55fdae6a7092620Affected
ac2a66665e231847cab11b8c8e844ce43207dd2e to before d16b71231e65cb05daea2b45701fcf09cef041e7Affected
ac2a66665e231847cab11b8c8e844ce43207dd2e to before 2014ac62df9d45bb9a004a043e85df7be09ed780Affected

LinuxLinux

4.16Affected
before 4.16Not affected
5.10.266 through 5.10.*Not affected
5.15.217 through 5.15.*Not affected
6.1.184 through 6.1.*Not affected
6.6.153 through 6.6.*Not affected
6.12.105 through 6.12.*Not affected
6.18.46 through 6.18.*Not affected
7.1.10 through 7.1.*Not affected
7.2 and laterNot affected

References

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