{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74579",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74579"
  ],
  "published": "2026-08-17T05:27:19Z",
  "summary": "netfilter: nft_payload: fix mask build for partial field offload",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_payload: fix mask build for partial field offload\n\nnft_payload_offload_mask() builds the offload match mask for a payload\nexpression that covers only part of a header field.  For a partial IPv6\naddress match (field_len = 16, priv_len = 1) that shift is 1 << 120, which\nis undefined on the 32-bit int operand.  It also trims only one word, so\nthe remaining words stay 0xffffffff (and when priv_len is a multiple of 4\nthe trim is skipped entirely), leaving the mask covering more bytes than\nthe rule matches.\n\n  UBSAN: shift-out-of-bounds in net/netfilter/nft_payload.c:278:20\n  shift exponent 120 is too large for 32-bit type 'int'\n  ...\n\nThe match is byte-granular and struct nft_data is zero-initialised, so the\ncorrect mask is simply the first priv_len bytes set to 0xff. Set those\nbytes directly and drop the word/shift trimming; this removes the undefined\nshift and no longer over-masks the trailing bytes.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
    }
  ],
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74579"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ee7b3f813b11f28cd6efdf7f24d64b5a7fd4dc7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8720df4504e0ed1781a702f65251bd47b3534d5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/363c3a84a946d53e5e121c9f47c7c2b7d228c46b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b19b5d2e042c294e2cc1c908dc598f9d64015396"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a375d8ace807767f29f276b681b6324c74929b1d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/16b553c46e347bc9de9946c4960654d5884a86de"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/630295d5bba1d0e0f494cc459452eb0a0058c545"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/39e88f28fb32bf02bd4b525c24c842c9cff5663d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The flaw is reached only when installing nftables rules via NETLINK_NETFILTER (NFT_MSG_NEWRULE) on NFT_CHAIN_HW_OFFLOAD netdev ingress chains; nft_flow_rule_create() calls nft_payload_offload_mask() during expr offload setup, which is a local netlink syscall path per kernel CNA guidance for nftables/netfilter.\nAC:L - An attacker with CAP_NET_ADMIN can deterministically craft a partial-field payload match (e.g., priv_len=1 on IPv6 saddr with field_len=16) on an HW-offload chain; no race, memory layout, or other conditions outside attacker control are required to hit the undefined shift and incorrect mask build.\nPR:L - All nf_tables netlink operations are gated by netlink_net_capable(skb, CAP_NET_ADMIN) in nfnetlink_rcv(), checked against the socket network namespace user_ns; unprivileged local users routinely obtain CAP_NET_ADMIN via user+network namespaces (unshare -Urn) on cloud hosts and containers.\nUI:N - No victim interaction is required; the attacker installs the malformed HW-offload nftables rule through their own netlink socket and triggers the bug during rule commit without needing another user to mount filesystems, open files, or take any action.\nS:U - Impact is confined to the host kernel and its hardware-offloaded netdev ingress filtering policy (incorrect TC flower masks, potential kernel crash); this is standard kernel/network-authority impact, not a VM escape, IOMMU bypass, or cross-security-boundary scope change.\nC:N - The bug corrupts on-stack bitmask construction during rule installation and does not perform out-of-bounds reads, use-after-free, or other memory-disclosure primitives; no attacker-influenced kernel memory read path exists beyond incorrect mask values.\nI:H - Incorrect or UB-corrupted HW flower match masks misprogram NIC ingress ACLs on hardware-offloaded edge firewalls, causing accept/drop/redirect actions to apply to traffic contrary to administrator intent; this is exploitable integrity compromise of enforced network policy on internet-facing offload deployments.\nA:H - The undefined shift (1<<120) triggers documented UBSAN shift-out-of-bounds at rule install and can panic/oops on UBSAN/trap kernels; misprogrammed HW offload masks can also blackhole or mis-drop production ingress traffic on netdev-offloaded chains, satisfying CNA high availability guidance."
    }
  }
}