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CVE-2026-74746

Linux

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, e...

CVSS
9.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.27
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.8

Vulnerability overview

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, e...

Affected product and versions

Product
Linux
Affected versions
>= ac2a66665e231847cab11b8c8e844ce43207dd2e < 0a00254585827f1695aa2700114af622ea754cfa, >= ac2a66665e231847cab11b8c8e844ce43207dd2e < be345dcbddb4643a54252b954af974b16eda8f91, >= ac2a66665e231847cab11b8c8e844ce43207dd2e < 211ee5d998d92a7d548811939c65942d06c146e4, >= ac2a66665e231847cab11b8c8e844ce43207dd2e < d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2, >= ac2a66665e231847cab11b8c8e844ce43207dd2e < 972fdf7c4f5c282a239c88fea614b056c33dc025, >= ac2a66665e231847cab11b8c8e844ce43207dd2e < d9d3050a70efe217e73a0751e55fdae6a7092620, >= ac2a66665e231847cab11b8c8e844ce43207dd2e < d16b71231e65cb05daea2b45701fcf09cef041e7, >= ac2a66665e231847cab11b8c8e844ce43207dd2e < 2014ac62df9d45bb9a004a043e85df7be09ed780, >= 4.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available