netfilter: flowtable: publish GC-visible tuple last

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74746
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-26 15:16:53 UTC
Updated2026-08-27 06:17:25 UTC
DescriptionIn 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.).

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.005430000 probability, percentile 0.433450000 (date 2026-08-27)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ac2a66665e231847cab11b8c8e844ce43207dd2e 0a00254585827f1695aa2700114af622ea754cfa git Not specified
CNA Linux Linux affected ac2a66665e231847cab11b8c8e844ce43207dd2e be345dcbddb4643a54252b954af974b16eda8f91 git Not specified
CNA Linux Linux affected ac2a66665e231847cab11b8c8e844ce43207dd2e 211ee5d998d92a7d548811939c65942d06c146e4 git Not specified
CNA Linux Linux affected ac2a66665e231847cab11b8c8e844ce43207dd2e d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2 git Not specified
CNA Linux Linux affected ac2a66665e231847cab11b8c8e844ce43207dd2e 972fdf7c4f5c282a239c88fea614b056c33dc025 git Not specified
CNA Linux Linux affected ac2a66665e231847cab11b8c8e844ce43207dd2e d9d3050a70efe217e73a0751e55fdae6a7092620 git Not specified
CNA Linux Linux affected ac2a66665e231847cab11b8c8e844ce43207dd2e d16b71231e65cb05daea2b45701fcf09cef041e7 git Not specified
CNA Linux Linux affected ac2a66665e231847cab11b8c8e844ce43207dd2e 2014ac62df9d45bb9a004a043e85df7be09ed780 git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 5.10.266 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.217 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.184 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.153 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.105 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.46 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.10 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/211ee5d998d92a7d548811939c65942d06c146e4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d9d3050a70efe217e73a0751e55fdae6a7092620 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a00254585827f1695aa2700114af622ea754cfa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d37917e7bebe078f3c17e47fd6fc1c9f6e8497b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/be345dcbddb4643a54252b954af974b16eda8f91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/972fdf7c4f5c282a239c88fea614b056c33dc025 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d16b71231e65cb05daea2b45701fcf09cef041e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2014ac62df9d45bb9a004a043e85df7be09ed780 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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