High severity7.8NVD Advisory· Published May 8, 2026· Updated Sep 15, 2026
CVE-2026-43329
CVE-2026-43329
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
86(expand)+ 8 more
- (no CPE)
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=5.5,<5.15.203
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
- (no CPE)
- osv-coords77 versionspkg:linux/kernelpkg:rpm/almalinux/bpftoolpkg:rpm/almalinux/kernelpkg:rpm/almalinux/kernel-64kpkg:rpm/almalinux/kernel-64k-corepkg:rpm/almalinux/kernel-64k-debugpkg:rpm/almalinux/kernel-64k-debug-corepkg:rpm/almalinux/kernel-64k-debug-develpkg:rpm/almalinux/kernel-64k-debug-devel-matchedpkg:rpm/almalinux/kernel-64k-debug-modulespkg:rpm/almalinux/kernel-64k-debug-modules-corepkg:rpm/almalinux/kernel-64k-debug-modules-extrapkg:rpm/almalinux/kernel-64k-develpkg:rpm/almalinux/kernel-64k-devel-matchedpkg:rpm/almalinux/kernel-64k-modulespkg:rpm/almalinux/kernel-64k-modules-corepkg:rpm/almalinux/kernel-64k-modules-extrapkg:rpm/almalinux/kernel-abi-stablelistspkg:rpm/almalinux/kernel-corepkg:rpm/almalinux/kernel-cross-headerspkg:rpm/almalinux/kernel-debugpkg:rpm/almalinux/kernel-debug-corepkg:rpm/almalinux/kernel-debug-develpkg:rpm/almalinux/kernel-debug-devel-matchedpkg:rpm/almalinux/kernel-debug-modulespkg:rpm/almalinux/kernel-debug-modules-corepkg:rpm/almalinux/kernel-debug-modules-extrapkg:rpm/almalinux/kernel-debug-uki-virtpkg:rpm/almalinux/kernel-develpkg:rpm/almalinux/kernel-devel-matchedpkg:rpm/almalinux/kernel-docpkg:rpm/almalinux/kernel-headerspkg:rpm/almalinux/kernel-modulespkg:rpm/almalinux/kernel-modules-corepkg:rpm/almalinux/kernel-modules-extrapkg:rpm/almalinux/kernel-modules-extra-matchedpkg:rpm/almalinux/kernel-rtpkg:rpm/almalinux/kernel-rt-64kpkg:rpm/almalinux/kernel-rt-64k-corepkg:rpm/almalinux/kernel-rt-64k-debugpkg:rpm/almalinux/kernel-rt-64k-debug-corepkg:rpm/almalinux/kernel-rt-64k-debug-develpkg:rpm/almalinux/kernel-rt-64k-debug-modulespkg:rpm/almalinux/kernel-rt-64k-debug-modules-corepkg:rpm/almalinux/kernel-rt-64k-debug-modules-extrapkg:rpm/almalinux/kernel-rt-64k-develpkg:rpm/almalinux/kernel-rt-64k-modulespkg:rpm/almalinux/kernel-rt-64k-modules-corepkg:rpm/almalinux/kernel-rt-64k-modules-extrapkg:rpm/almalinux/kernel-rt-corepkg:rpm/almalinux/kernel-rt-debugpkg:rpm/almalinux/kernel-rt-debug-corepkg:rpm/almalinux/kernel-rt-debug-develpkg:rpm/almalinux/kernel-rt-debug-modulespkg:rpm/almalinux/kernel-rt-debug-modules-corepkg:rpm/almalinux/kernel-rt-debug-modules-extrapkg:rpm/almalinux/kernel-rt-develpkg:rpm/almalinux/kernel-rt-modulespkg:rpm/almalinux/kernel-rt-modules-corepkg:rpm/almalinux/kernel-rt-modules-extrapkg:rpm/almalinux/kernel-toolspkg:rpm/almalinux/kernel-tools-libspkg:rpm/almalinux/kernel-tools-libs-develpkg:rpm/almalinux/kernel-uki-virtpkg:rpm/almalinux/kernel-uki-virt-addonspkg:rpm/almalinux/kernel-zfcpdumppkg:rpm/almalinux/kernel-zfcpdump-corepkg:rpm/almalinux/kernel-zfcpdump-develpkg:rpm/almalinux/kernel-zfcpdump-devel-matchedpkg:rpm/almalinux/kernel-zfcpdump-modulespkg:rpm/almalinux/kernel-zfcpdump-modules-corepkg:rpm/almalinux/kernel-zfcpdump-modules-extrapkg:rpm/almalinux/libperfpkg:rpm/almalinux/perfpkg:rpm/almalinux/python3-perfpkg:rpm/almalinux/rtlapkg:rpm/almalinux/rv
>= 5.5.0, < 5.15.203+ 76 more
- (no CPE)range: >= 5.5.0, < 5.15.203
- (no CPE)range: < 4.18.0-553.134.1.el8_10
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
- (no CPE)range: < 6.12.0-211.20.1.el10_2
Patches
Vulnerability mechanics
References
40- git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877nvdPatch
- git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284ccnvdPatch
- git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5envdPatch
- git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893nvdPatch
- git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309envdPatch
- git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614nvdPatch
- git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56eadnvdPatch
- access.redhat.com/errata/RHSA-2026:23329nvd
- access.redhat.com/errata/RHSA-2026:26427nvd
- access.redhat.com/errata/RHSA-2026:26428nvd
- access.redhat.com/errata/RHSA-2026:27713nvd
- access.redhat.com/errata/RHSA-2026:30848nvd
- access.redhat.com/errata/RHSA-2026:33215nvd
- access.redhat.com/errata/RHSA-2026:33899nvd
- access.redhat.com/errata/RHSA-2026:33900nvd
- access.redhat.com/errata/RHSA-2026:34094nvd
- access.redhat.com/errata/RHSA-2026:34095nvd
- access.redhat.com/errata/RHSA-2026:35863nvd
- access.redhat.com/errata/RHSA-2026:35896nvd
- access.redhat.com/errata/RHSA-2026:40764nvd
- access.redhat.com/errata/RHSA-2026:43252nvd
- access.redhat.com/errata/RHSA-2026:44230nvd
- access.redhat.com/errata/RHSA-2026:44231nvd
- access.redhat.com/errata/RHSA-2026:44259nvd
- access.redhat.com/errata/RHSA-2026:44262nvd
- access.redhat.com/errata/RHSA-2026:47702nvd
- access.redhat.com/errata/RHSA-2026:47727nvd
- access.redhat.com/errata/RHSA-2026:54187nvd
- access.redhat.com/errata/RHSA-2026:55618nvd
- access.redhat.com/errata/RHSA-2026:55761nvd
- access.redhat.com/errata/RHSA-2026:55762nvd
- access.redhat.com/errata/RHSA-2026:55763nvd
- access.redhat.com/errata/RHSA-2026:55837nvd
- access.redhat.com/errata/RHSA-2026:56224nvd
- access.redhat.com/errata/RHSA-2026:56225nvd
- access.redhat.com/errata/RHSA-2026:56853nvd
- access.redhat.com/errata/RHSA-2026:56911nvd
- access.redhat.com/security/cve/CVE-2026-43329nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43329.jsonnvd
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