cve-2026-43329
HIGH CVSS 7.8 nvd
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.
Timeline
- Published
- 2026-05-08
- Last Modified
- 2026-09-15
CVSS Details
- Attack Vector
- LOCAL
- Attack Complexity
- LOW
- Privileges Required
- LOW
Affected Products
- linux linux_kernel
Weaknesses (CWE)
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 3.1 | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8 | 5.9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
| 3.1 | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8 | 5.9 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
CPE configurations
OR
| CPE | Version range | Vulnerable |
|---|---|---|
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 5.5, < 5.15.203 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 5.16, < 6.1.168 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.2, < 6.6.134 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.7, < 6.12.81 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.13, < 6.18.22 | yes |
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
>= 6.19, < 6.19.12 | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* |
— | yes |
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* |
— | yes |
NVD metadata
- NVD status
- Modified
- Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877 Patch
- https://git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284cc Patch
- https://git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5e Patch
- https://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893 Patch
- https://git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309e Patch
- https://git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614 Patch
- https://git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56ead Patch
- 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
- https://access.redhat.com/errata/RHSA-2026:47702
- https://access.redhat.com/errata/RHSA-2026:47727
- https://access.redhat.com/errata/RHSA-2026:54187
- https://access.redhat.com/errata/RHSA-2026:55618
- https://access.redhat.com/errata/RHSA-2026:55761
- https://access.redhat.com/errata/RHSA-2026:55762
- https://access.redhat.com/errata/RHSA-2026:55763
- https://access.redhat.com/errata/RHSA-2026:55837
- https://access.redhat.com/errata/RHSA-2026:56224
- https://access.redhat.com/errata/RHSA-2026:56225
- https://access.redhat.com/errata/RHSA-2026:56853
- https://access.redhat.com/errata/RHSA-2026:56911
- https://access.redhat.com/security/cve/CVE-2026-43329
- https://bugzilla.redhat.com/show_bug.cgi?id=2468124
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43329.json
Linked Vulnerabilities
{
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"datePublished": "2026-05-08T14:16:42.520",
"dateUpdated": "2026-09-15T12:17:48.337",
"description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable: strictly check for maximum number of actions\n\nThe maximum number of flowtable hardware offload actions in IPv6 is:\n\n* ethernet mangling (4 payload actions, 2 for each ethernet address)\n* SNAT (4 payload actions)\n* DNAT (4 payload actions)\n* Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing)\n for QinQ.\n* Redirect (1 action)\n\nWhich makes 17, while the maximum is 16. But act_ct supports for tunnels\nactions too. Note that payload action operates at 32-bit word level, so\nmangling an IPv6 address takes 4 payload actions.\n\nUpdate flow_action_entry_next() calls to check for the maximum number of\nsupported actions.\n\nWhile at it, rise the maximum number of actions per flow from 16 to 24\nso this works fine with IPv6 setups.",
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