Vulnerability-Lookup

FKIE_CVE-2026-43329

Vulnerability from fkie_nvd - Published: 2026-05-08 14:16 - Updated: 2026-07-07 12:16

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284cc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56ead	Patch
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:23329
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:26427
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:26428
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:27713
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:30848
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:33215
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:33899
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:33900
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34094
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34095
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:35863
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:35896
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-43329
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2468124
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43329.json

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
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          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_flow_table_offload.c"
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          "vendor": "Linux",
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  "descriptions": [
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      "value": "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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}

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

Vulnerability from cvelistv5 – Published: 2026-05-08 13:31 – Updated: 2026-07-07 12:05

Title

netfilter: flowtable: strictly check for maximum number of actions

Summary

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

Linux

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…

Impacted products

Vendor

Product

Version

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)

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)

Show details on NVD website

JSON

To clipboard

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            "tags": [
              "issue-tracking",
              "x_refsource_REDHAT"
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            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468124"
          },
          {
            "tags": [
              "x_sadp-csaf-vex"
            ],
            "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43329.json"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:33215"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:23329"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
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            "tags": [
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            "url": "https://access.redhat.com/errata/RHSA-2026:34094"
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            "tags": [
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              "vendor-advisory",
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          },
          {
            "tags": [
              "vendor-advisory",
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            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:35863"
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            "tags": [
              "vendor-advisory",
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            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:33900"
          }
        ],
        "solutions": [
          {
            "lang": "en",
            "value": "RHSA-2026:33215: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0), Red Hat Enterprise Linux Real Time EUS (v. 10.0), Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:23329: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:34095: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2)"
          },
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          },
          {
            "lang": "en",
            "value": "RHSA-2026:34094: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30848: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:26427: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35896: Red Hat Enterprise Linux BaseOS AUS (v.8.4), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)"
          },
          {
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            "value": "RHSA-2026:33899: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35863: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:26428: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33900: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)"
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        ],
        "timeline": [
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            "lang": "en",
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            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-05-08T00:00:00.000Z",
            "value": "Made public."
          }
        ],
        "title": "kernel: netfilter: flowtable: strictly check for maximum number of actions",
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          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_flow_table_offload.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "ead66c77303f760f6c30be96e2e20d5a77cef614",
              "status": "affected",
              "version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "c29f74e0df7a02b8303bcdce93a7c0132d62577a",
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            },
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            },
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              "status": "affected",
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          ]
        },
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.134",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.81",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.134",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.18.22",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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          ]
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      "descriptions": [
        {
          "lang": "en",
          "value": "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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      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        },
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        },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893"
        }
      ],
      "title": "netfilter: flowtable: strictly check for maximum number of actions",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43329",
    "datePublished": "2026-05-08T13:31:17.479Z",
    "dateReserved": "2026-05-01T14:12:56.002Z",
    "dateUpdated": "2026-07-07T12:05:10.637Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

FKIE_CVE-2026-43329

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

Tags

Sightings

Nomenclature