{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38162",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38162"
  ],
  "published": "2025-07-03T08:36:23Z",
  "summary": "netfilter: nft_set_pipapo: prevent overflow in lookup table allocation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_set_pipapo: prevent overflow in lookup table allocation\n\nWhen calculating the lookup table size, ensure the following\nmultiplication does not overflow:\n\n- desc->field_len[] maximum value is U8_MAX multiplied by\n  NFT_PIPAPO_GROUPS_PER_BYTE(f) that can be 2, worst case.\n- NFT_PIPAPO_BUCKETS(f->bb) is 2^8, worst case.\n- sizeof(unsigned long), from sizeof(*f->lt), lt in\n  struct nft_pipapo_field.\n\nThen, use check_mul_overflow() to multiply by bucket size and then use\ncheck_add_overflow() to the alignment for avx2 (if needed). Finally, add\nlt_size_check_overflow() helper and use it to consolidate this.\n\nWhile at it, replace leftover allocation using the GFP_KERNEL to\nGFP_KERNEL_ACCOUNT for consistency, in pipapo_resize().",
  "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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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38162"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/91edc076439c9e2f34b176149f1c84a47a8ec32f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a9e757473561da93c6a4136f0e59aba91ec777fc"
    },
    {
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      "url": "https://git.kernel.org/stable/c/c1360ac8156c0a3f2385baef91d8d26fd9d39701"
    },
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      "url": "https://git.kernel.org/stable/c/43fe1181f738295624696ae9ff611790edb65b5e"
    },
    {
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      "url": "https://git.kernel.org/stable/c/4c5c6aa9967dbe55bd017bb509885928d0f31206"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable allocation is reached only through nftables set creation and element insertion via the nfnetlink netlink socket (NFT_MSG_NEWSET/NFT_MSG_NEWSETELEM), which requires local system access. Per kernel scoring guidance, netfilter/nftables netlink paths are Local.\nAC:L - Every input that feeds the overflowing expression \u2014 field count, per-field length via NFTA_SET_DESC_CONCAT, group-bit width, and the rule count that drives bsize \u2014 is chosen directly by the attacker, with no race to win and no memory layout or victim state outside their control. The attack is deterministic and repeatable.\nPR:L - nfnetlink_rcv() enforces only netlink_net_capable(skb, CAP_NET_ADMIN), which is namespace-relative, so any unprivileged local user obtains it with unshare -Urn and can then create pipapo sets and insert elements. This is Low, not High, since no real root in the init namespace is needed.\nUI:N - The attacker performs the whole sequence themselves through netlink syscalls; no victim needs to open a file, mount a filesystem, or take any other action.\nS:U - The integer overflow and the resulting memory corruption are both confined to the kernel's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary. This is a standard in-kernel privilege-escalation shape.\nC:H - The undersized lookup table is subsequently indexed by pipapo_bucket_set() and by the AVX2/generic lookup routines using the un-truncated groups/buckets/bsize geometry, producing out-of-bounds reads of adjacent kernel memory that can be observed through set matching results and element dumps. Heap corruption of this kind is treated as enabling arbitrary read.\nI:H - After the wrap, pipapo_resize()'s memcpy loop and every __set_bit() in pipapo_insert() write beyond the allocation, giving a controlled out-of-bounds heap write into adjacent objects. An OOB write of this form is exploitable for control-flow hijacking or arbitrary modification of kernel structures.\nA:H - Writing past the end of a kvzalloc()'d region corrupts neighbouring allocations and slab/vmalloc metadata, reliably producing an oops or panic (immediately under KASAN or hardened allocators). Any such kernel crash is High."
    }
  }
}