netfilter: nf_tables: release flowtable after rcu grace period on error

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Summary

CVECVE-2026-23392
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-25 11:16:39 UTC
Updated2026-04-02 15:16:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtable can be already registered, exposing this flowtable to packet path and nfnetlink_hook control plane. This error path is rare, it should only happen by reaching the maximum number hooks or by failing to set up to hardware offload, just call synchronize_rcu(). There is a check for already used device hooks by different flowtable that could result in EEXIST at this late stage. The hook parser can be updated to perform this check earlier to this error path really becomes rarely exercised. Uncovered by KASAN reported as use-after-free from nfnetlink_hook path when dumping hooks.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000130000 probability, percentile 0.023240000 (date 2026-04-03)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 d2632de96ccb066e0131ad1494241b9c281c60b8 git Not specified
CNA Linux Linux affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 adee3436ccd29f1e514c028899e400cbc6d84065 git Not specified
CNA Linux Linux affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 7e3955b282eae20d61c75e499c75eade51c20060 git Not specified
CNA Linux Linux affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 c8092edb9a11f20f95ccceeb9422b7dd0df337bd git Not specified
CNA Linux Linux affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 e78a2dcc7cfb87b64a631441ca7681492b347ef6 git Not specified
CNA Linux Linux affected 3b49e2e94e6ebb8b23d0955d9e898254455734f8 d73f4b53aaaea4c95f245e491aa5eeb8a21874ce git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 6.1.167 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.130 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.78 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.20 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.10 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/adee3436ccd29f1e514c028899e400cbc6d84065 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d73f4b53aaaea4c95f245e491aa5eeb8a21874ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e3955b282eae20d61c75e499c75eade51c20060 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d2632de96ccb066e0131ad1494241b9c281c60b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e78a2dcc7cfb87b64a631441ca7681492b347ef6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c8092edb9a11f20f95ccceeb9422b7dd0df337bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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