Answer in brief
CVE-2026-43329 records a High severity (CVSS 7.8) vulnerability in netfilter: flowtable: strictly check for maximum number of actions. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-43329 records a High severity (CVSS 7.8) vulnerability in netfilter: flowtable: strictly check for maximum number of actions. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <ead66c77303f760f6c30be96e2e20d5a77cef614 || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <fe9018d3e94329f1951b00805a8640bc06f56ead || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <5382bb03e9c33b089d60788478b922a2dca284cc || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <57c78bd2e2dd08897acd35b2bf8bcef322e36f5e || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <504c9456699dcf4d15195ef34a0fa94a80bfc877 || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <879959a7a2be814dd57568655eafa3d8f4d0309e || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <76522fcdbc3a02b568f5d957f7e66fc194abb893 | ead66c77303f760f6c30be96e2e20d5a77cef614, fe9018d3e94329f1951b00805a8640bc06f56ead, 5382bb03e9c33b089d60788478b922a2dca284cc, 57c78bd2e2dd08897acd35b2bf8bcef322e36f5e, 504c9456699dcf4d15195ef34a0fa94a80bfc877, 879959a7a2be814dd57568655eafa3d8f4d0309e, 76522fcdbc3a02b568f5d957f7e66fc194abb893 |
| Linux/Linuxgeneric | 5.5 | Not reported |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 1, 2026
In 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.
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <ead66c77303f760f6c30be96e2e20d5a77cef614 || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <fe9018d3e94329f1951b00805a8640bc06f56ead || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <5382bb03e9c33b089d60788478b922a2dca284cc || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <57c78bd2e2dd08897acd35b2bf8bcef322e36f5e || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <504c9456699dcf4d15195ef34a0fa94a80bfc877 || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <879959a7a2be814dd57568655eafa3d8f4d0309e || >=c29f74e0df7a02b8303bcdce93a7c0132d62577a <76522fcdbc3a02b568f5d957f7e66fc194abb893 | ead66c77303f760f6c30be96e2e20d5a77cef614, fe9018d3e94329f1951b00805a8640bc06f56ead, 5382bb03e9c33b089d60788478b922a2dca284cc, 57c78bd2e2dd08897acd35b2bf8bcef322e36f5e, 504c9456699dcf4d15195ef34a0fa94a80bfc877, 879959a7a2be814dd57568655eafa3d8f4d0309e, 76522fcdbc3a02b568f5d957f7e66fc194abb893 |
| Linux/Linuxgeneric | 5.5 | Not reported |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 1, 2026
In 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.
Quoted source text, attributed separately from HOL analysis.