CVE-2026-43329 (GCVE-0-2026-43329)
Vulnerability from cvelistv5
Published
2026-05-08 13:31
Modified
2026-08-27 12:04
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.
Impacted products
Vendor Product Version
Linux Linux Version: c29f74e0df7a02b8303bcdce93a7c0132d62577a
Version: c29f74e0df7a02b8303bcdce93a7c0132d62577a
Version: c29f74e0df7a02b8303bcdce93a7c0132d62577a
Version: c29f74e0df7a02b8303bcdce93a7c0132d62577a
Version: c29f74e0df7a02b8303bcdce93a7c0132d62577a
Version: c29f74e0df7a02b8303bcdce93a7c0132d62577a
Version: c29f74e0df7a02b8303bcdce93a7c0132d62577a
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            "value": "RHSA-2026:26428: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)"
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            "value": "Reported to Red Hat."
          },
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        "title": "kernel: netfilter: flowtable: strictly check for maximum number of actions",
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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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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The vulnerable flowtable offload action array is reached through local netfilter/nftables or tc netlink configuration and packet-triggered flow offload work. A remote packet can trigger an already configured flow, but creating the vulnerable offload setup is a local control-plane action.\nAC:L - There is no race or probabilistic condition; once the attacker can create the qualifying IPv6/NAT/VLAN/tunnel hardware-offload flowtable setup, creating a flow reliably drives action allocation past the old bound. The required action combination is complex but attacker-controlled in the local netlink setup.\nPR:L - nfnetlink/rtnetlink require CAP_NET_ADMIN, but this is reachable as a low-privileged local user in a user and network namespace where CAP_NET_ADMIN is granted. It does not require real init-namespace root in the highest defensible local scenario.\nUI:N - No victim user action is required after the attacker configures the local netfilter/tc objects. The attacker can generate the traffic needed to instantiate the flow.\nS:U - The corruption occurs inside the kernel networking/offload subsystem and impacts the same kernel security authority. This is standard kernel memory corruption, not a cross-scope escape such as guest-to-host.\nC:H - The bug is a slab out-of-bounds write past a flex-array of flow_action_entry objects. Kernel heap memory corruption is defensibly exploitable for information disclosure primitives.\nI:H - The unchecked append writes attacker-influenced flow_action_entry fields beyond the allocated action array. Such kernel heap out-of-bounds writes are defensibly exploitable for arbitrary memory corruption or code execution.\nA:H - Even without full exploitation, writing past the allocated flow action array can corrupt adjacent kernel heap objects and cause an oops or panic. Repeated triggering can therefore cause high availability impact."
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        "dateUpdated": "2026-08-05T12:27:15.192Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893"
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      "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": "2026-08-27T12:04:48.593Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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