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High 7.8Published May 8, 2026

CVE-2026-43329netfilter: flowtable: strictly check for maximum number of actions

Updated under an hour ago ()

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It affects Linux and 9 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS
7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE)
CWE-770, CWE-122
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
Linux
NVD analysis
Modified
Record last updated
Oct 19, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
Linux Linux
linux:linux (from the name)
from c29f74e0df7a02b8303bcdce93a7c0132d62577a before ead66c77303f760f6c30be96e2e20d5a77cef614; from c29f74e0df7a02b8303bcdce93a7c0132d62577a before fe9018d3e94329f1951b00805a8640bc06f56ead; from c29f74e0df7a02b8303bcdce93a7c0132d62577a before 5382bb03e9c33b089d60788478b922a2dca284cc; from c29f74e0df7a02b8303bcdce93a7c0132d62577a before 57c78bd2e2dd08897acd35b2bf8bcef322e36f5e; from c29f74e0df7a02b8303bcdce93a7c0132d62577a before 504c9456699dcf4d15195ef34a0fa94a80bfc877; from c29f74e0df7a02b8303bcdce93a7c0132d62577a before 879959a7a2be814dd57568655eafa3d8f4d0309e; from c29f74e0df7a02b8303bcdce93a7c0132d62577a before 76522fcdbc3a02b568f5d957f7e66fc194abb893
CNA record
from 0:6.12.0-211.20.1.el10_2 not affected
CISA ADP
from 0:6.12.0-55.84.1.el10_0 not affected
CISA ADP
from 0:4.18.0-305.197.1.el8_4 not affected
CISA ADP
from 0:4.18.0-305.197.1.el8_4 not affected
CISA ADP
from 0:4.18.0-477.150.1.el8_8 not affected
CISA ADP
from 0:4.18.0-477.150.1.el8_8 not affected
CISA ADP
from 0:5.14.0-570.125.1.el9_6 not affected
CISA ADP
from 412.86.202607211933-0 not affected
CISA ADP
linux linux_kernel
linux:linux_kernel
from 5.5 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; 7.0; and 4 more ranges
NVD

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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