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CVE-2026-74746

CRITICALCVSS 9.8/10

Last modified

CVE-2026-74746 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.)..

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.).

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= ac2a66665e231847cab11b8c8e844ce43207dd2e, < 0a00254585827f1695aa2700114af622ea754cfa; >= ac2a66665e231847cab11b8c8e844ce43207dd2e, < be345dcbddb4643a54252b954af974b16eda8f91; >= ac2a66665e231847cab11b8c8e844ce43207dd2e, < 211ee5d998d92a7d548811939c65942d06c146e4; >= ac2a66665e231847cab11b8c8e844ce43207dd2e, < d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2; >= ac2a66665e231847cab11b8c8e844ce43207dd2e, < 972fdf7c4f5c282a239c88fea614b056c33dc025; >= ac2a66665e231847cab11b8c8e844ce43207dd2e, < d9d3050a70efe217e73a0751e55fdae6a7092620; >= ac2a66665e231847cab11b8c8e844ce43207dd2e, < d16b71231e65cb05daea2b45701fcf09cef041e7; >= ac2a66665e231847cab11b8c8e844ce43207dd2e, < 2014ac62df9d45bb9a004a043e85df7be09ed780
LinuxLinux4.16

References

Timeline

Published
Last Modified
Status
Received

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 severe is CVE-2026-74746?
CVE-2026-74746 has a CVSS score of 9.8/10 (CRITICAL severity).
How do I fix CVE-2026-74746?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST