CVE-2026-43329 (GCVE-0-2026-43329)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:31 – Updated: 2026-07-15 00:55
VLAI
Title
netfilter: flowtable: strictly check for maximum number of actions
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
URL Tags
https://git.kernel.org/stable/c/ead66c77303f760f6…
https://git.kernel.org/stable/c/fe9018d3e94329f19…
https://git.kernel.org/stable/c/5382bb03e9c33b089…
https://git.kernel.org/stable/c/57c78bd2e2dd08897…
https://git.kernel.org/stable/c/504c9456699dcf4d1…
https://git.kernel.org/stable/c/879959a7a2be814dd…
https://git.kernel.org/stable/c/76522fcdbc3a02b56…
https://access.redhat.com/security/cve/CVE-2026-43329 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2468124 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:33215 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23329 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34095 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:27713 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34094 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30848 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26427 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35896 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33899 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35863 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26428 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33900 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
Linux Linux Affected: c29f74e0df7a02b8303bcdce93a7c0132d62577a , < ead66c77303f760f6c30be96e2e20d5a77cef614 (git)
Affected: c29f74e0df7a02b8303bcdce93a7c0132d62577a , < fe9018d3e94329f1951b00805a8640bc06f56ead (git)
Affected: c29f74e0df7a02b8303bcdce93a7c0132d62577a , < 5382bb03e9c33b089d60788478b922a2dca284cc (git)
Affected: c29f74e0df7a02b8303bcdce93a7c0132d62577a , < 57c78bd2e2dd08897acd35b2bf8bcef322e36f5e (git)
Affected: c29f74e0df7a02b8303bcdce93a7c0132d62577a , < 504c9456699dcf4d15195ef34a0fa94a80bfc877 (git)
Affected: c29f74e0df7a02b8303bcdce93a7c0132d62577a , < 879959a7a2be814dd57568655eafa3d8f4d0309e (git)
Affected: c29f74e0df7a02b8303bcdce93a7c0132d62577a , < 76522fcdbc3a02b568f5d957f7e66fc194abb893 (git)
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Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:6.12.0-211.20.1.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support Unaffected: 0:6.12.0-55.84.1.el10_0 , < * (rpm)
    cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.18.0-553.134.1.rt7.475.el8_10 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:8::nfv
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:4.18.0-553.134.1.el8_10 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Unaffected: 0:4.18.0-305.197.1.el8_4 , < * (rpm)
    cpe:/o:redhat:rhel_aus:8.4
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Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Unaffected: 0:4.18.0-305.197.1.el8_4 , < * (rpm)
    cpe:/o:redhat:rhel_eus_long_life:8.4
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Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Unaffected: 0:4.18.0-372.198.1.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_aus:8.6
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Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Unaffected: 0:4.18.0-372.198.1.el8_6 , < * (rpm)
    cpe:/o:redhat:rhel_eus_long_life:8.6
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Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service Unaffected: 0:4.18.0-477.150.1.el8_8 , < * (rpm)
    cpe:/o:redhat:rhel_tus:8.8
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Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Unaffected: 0:4.18.0-477.150.1.el8_8 , < * (rpm)
    cpe:/o:redhat:rhel_e4s:8.8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:5.14.0-687.19.1.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
    cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:5.14.0-284.178.1.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2
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Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Unaffected: 0:5.14.0-284.178.1.rt14.463.el9_2 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.2::nfv
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Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Unaffected: 0:5.14.0-427.134.1.el9_4 , < * (rpm)
    cpe:/a:redhat:rhel_e4s:9.4
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Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support Unaffected: 0:5.14.0-570.125.1.el9_6 , < * (rpm)
    cpe:/a:redhat:rhel_eus:9.6
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-06T19:04:05+00:00",
      "cve": "CVE-2026-43329",
      "id": "CVE-2026-43329",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:fixed": "1980",
      "product_status:known_affected": "23",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: flowtable: strictly check for maximum number of actions",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43329.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-19T17:38:50Z",
      "cve": "CVE-2026-43329",
      "id": "CVE-2026-43329",
      "initial_release_date": "2026-05-13T03:35:18Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "425",
      "product_status:known_not_affected": "77",
      "product_status:recommended": "549",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43329",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43329.json",
      "version": "24"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.