{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53267",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-53267"
  ],
  "published": "2026-06-25T08:41:40Z",
  "summary": "netfilter: nft_ct: bail out on template ct in get eval",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_ct: bail out on template ct in get eval\n\nI noticed this issue while looking at a historic syzbot report [1].\n\nA rule like the one below is enough to trigger the bug:\n\n    table ip t {\n        chain pre {\n            type filter hook prerouting priority raw;\n            ct zone set 1\n            ct original saddr 1.2.3.4 accept\n        }\n    }\n\nThe first expression attaches a per-cpu template ct via\nnft_ct_set_zone_eval() (nf_ct_tmpl_alloc -> kzalloc, tuple is all\nzero, nf_ct_l3num(ct) == 0). The next expression then calls\nnft_ct_get_eval() on the same skb, treats the template as a real ct\nand hits the 16-byte memcpy path. With dreg at NFT_REG32_15 this\noverflows past struct nft_regs on the kernel stack; with smaller\ndreg values it silently clobbers adjacent registers.\n\nReject template ct at the eval entry and in nft_ct_get_fast_eval(),\nmirroring the check nft_ct_set_eval() already has. Additionally,\nbound the address copy in NFT_CT_SRC / NFT_CT_DST by priv->len\ninstead of by nf_ct_l3num(ct): nf_ct_get_tuple() zeroes the tuple\nbefore pkt_to_tuple() fills in only the protocol-relevant leading\nbytes, so the trailing bytes of tuple->{src,dst}.u3.all are\nwell-defined zero. priv->len is validated at rule load, so the\ncopy size is now bounded by the destination register rather than\nby an untrusted field on the conntrack.\n\n[1]: https://syzkaller.appspot.com/bug?id=389cf09cb72926114fce90dc85a2c3231dcb647c",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3027ecbdb5fdf9200251c21d4818e4c447ef78e1"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable code is reached by installing crafted nftables/netfilter rules through NETLINK_NETFILTER and then triggering packet evaluation locally. Remote packets alone cannot install the rule, so this is a local attack vector.\nAC:L - A single crafted rule sequence such as `ct zone set` followed by `ct original saddr` can deterministically trigger the bug on matching packets. No race or external condition beyond the attacker's control is required.\nPR:L - Rule creation requires CAP_NET_ADMIN for the relevant network namespace via nfnetlink. Because nftables is reachable with CAP_NET_ADMIN in a user-created network namespace on systems permitting unprivileged user namespaces, this is low privileges rather than high.\nUI:N - After the attacker installs the crafted rule, triggering occurs through packet processing without any victim user action. No user needs to open a file, mount anything, or interact with attacker-controlled content.\nS:U - The bug corrupts kernel memory during kernel packet-filter evaluation and impacts the same kernel security authority. This is standard kernel privilege escalation/DoS behavior, not a VM, IOMMU, or distinct security-scope escape.\nC:H - The bug is a kernel stack out-of-bounds write past `struct nft_regs`, a memory corruption primitive. Under the required higher-severity rule, such memory corruption is defensibly treated as capable of enabling high confidentiality impact.\nI:H - The vulnerable 16-byte memcpy can overwrite beyond the validated destination register on the kernel stack. Out-of-bounds kernel writes are high integrity impact because they can plausibly be developed into control-flow or privilege-modification primitives.\nA:H - The stack overwrite can corrupt adjacent stack state or registers during packet evaluation and can crash or oops the kernel. Kernel crash or panic is high availability impact."
    }
  }
}