netfilter: flowtable: strictly check for maximum number of actions

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Summary

CVECVE-2026-43329
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 14:16:42 UTC
Updated2026-05-11 08:16:09 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: strictly check for maximum number of actions The maximum number of flowtable hardware offload actions in IPv6 is: * ethernet mangling (4 payload actions, 2 for each ethernet address) * SNAT (4 payload actions) * DNAT (4 payload actions) * Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing) for QinQ. * Redirect (1 action) Which makes 17, while the maximum is 16. But act_ct supports for tunnels actions too. Note that payload action operates at 32-bit word level, so mangling an IPv6 address takes 4 payload actions. Update flow_action_entry_next() calls to check for the maximum number of supported actions. While at it, rise the maximum number of actions per flow from 16 to 24 so this works fine with IPv6 setups.

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: 0.000240000 probability, percentile 0.070400000 (date 2026-05-10)

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 c29f74e0df7a02b8303bcdce93a7c0132d62577a ead66c77303f760f6c30be96e2e20d5a77cef614 git Not specified
CNA Linux Linux affected c29f74e0df7a02b8303bcdce93a7c0132d62577a fe9018d3e94329f1951b00805a8640bc06f56ead git Not specified
CNA Linux Linux affected c29f74e0df7a02b8303bcdce93a7c0132d62577a 5382bb03e9c33b089d60788478b922a2dca284cc git Not specified
CNA Linux Linux affected c29f74e0df7a02b8303bcdce93a7c0132d62577a 57c78bd2e2dd08897acd35b2bf8bcef322e36f5e git Not specified
CNA Linux Linux affected c29f74e0df7a02b8303bcdce93a7c0132d62577a 504c9456699dcf4d15195ef34a0fa94a80bfc877 git Not specified
CNA Linux Linux affected c29f74e0df7a02b8303bcdce93a7c0132d62577a 879959a7a2be814dd57568655eafa3d8f4d0309e git Not specified
CNA Linux Linux affected c29f74e0df7a02b8303bcdce93a7c0132d62577a 76522fcdbc3a02b568f5d957f7e66fc194abb893 git Not specified
CNA Linux Linux affected 5.5 Not specified
CNA Linux Linux unaffected 5.5 semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56ead 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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