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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Free account, 1 product
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
- 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 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
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 |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:6.12.0-211.20.1.el10_2 not affected | CISA ADP |
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus | 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 | |
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life | 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 | |
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support redhat:rhel_eus | from 0:5.14.0-570.125.1.el9_6 not affected | CISA ADP |
Red Hat Red Hat OpenShift Container Platform 4.12 redhat:openshift | 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
- https://git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614patch
- https://git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56eadpatch
- https://git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284ccpatch
- https://git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5epatch
- https://git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877patch
- https://git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309epatch
- https://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893patch
- https://access.redhat.com/errata/RHSA-2026:23329
- https://access.redhat.com/errata/RHSA-2026:26427
- https://access.redhat.com/errata/RHSA-2026:26428
- https://access.redhat.com/errata/RHSA-2026:27713
- https://access.redhat.com/errata/RHSA-2026:30848
- https://access.redhat.com/errata/RHSA-2026:33215
- https://access.redhat.com/errata/RHSA-2026:33899
- https://access.redhat.com/errata/RHSA-2026:33900
- https://access.redhat.com/errata/RHSA-2026:34094
- https://access.redhat.com/errata/RHSA-2026:34095
- https://access.redhat.com/errata/RHSA-2026:35863
- https://access.redhat.com/errata/RHSA-2026:35896
- https://access.redhat.com/errata/RHSA-2026:40764
- https://access.redhat.com/errata/RHSA-2026:43252
- https://access.redhat.com/errata/RHSA-2026:44230
- https://access.redhat.com/errata/RHSA-2026:44231
- https://access.redhat.com/errata/RHSA-2026:44259
- https://access.redhat.com/errata/RHSA-2026:44262
The CVE record on cve.org NVD's entry
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.