FKIE_CVE-2025-71160

Vulnerability from fkie_nvd - Published: 2026-01-23 16:15 - Updated: 2026-02-26 20:19
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: avoid chain re-validation if possible Hamza Mahfooz reports cpu soft lock-ups in nft_chain_validate(): watchdog: BUG: soft lockup - CPU#1 stuck for 27s! [iptables-nft-re:37547] [..] RIP: 0010:nft_chain_validate+0xcb/0x110 [nf_tables] [..] nft_immediate_validate+0x36/0x50 [nf_tables] nft_chain_validate+0xc9/0x110 [nf_tables] nft_immediate_validate+0x36/0x50 [nf_tables] nft_chain_validate+0xc9/0x110 [nf_tables] nft_immediate_validate+0x36/0x50 [nf_tables] nft_chain_validate+0xc9/0x110 [nf_tables] nft_immediate_validate+0x36/0x50 [nf_tables] nft_chain_validate+0xc9/0x110 [nf_tables] nft_immediate_validate+0x36/0x50 [nf_tables] nft_chain_validate+0xc9/0x110 [nf_tables] nft_immediate_validate+0x36/0x50 [nf_tables] nft_chain_validate+0xc9/0x110 [nf_tables] nft_table_validate+0x6b/0xb0 [nf_tables] nf_tables_validate+0x8b/0xa0 [nf_tables] nf_tables_commit+0x1df/0x1eb0 [nf_tables] [..] Currently nf_tables will traverse the entire table (chain graph), starting from the entry points (base chains), exploring all possible paths (chain jumps). But there are cases where we could avoid revalidation. Consider: 1 input -> j2 -> j3 2 input -> j2 -> j3 3 input -> j1 -> j2 -> j3 Then the second rule does not need to revalidate j2, and, by extension j3, because this was already checked during validation of the first rule. We need to validate it only for rule 3. This is needed because chain loop detection also ensures we do not exceed the jump stack: Just because we know that j2 is cycle free, its last jump might now exceed the allowed stack size. We also need to update all reachable chains with the new largest observed call depth. Care has to be taken to revalidate even if the chain depth won't be an issue: chain validation also ensures that expressions are not called from invalid base chains. For example, the masquerade expression can only be called from NAT postrouting base chains. Therefore we also need to keep record of the base chain context (type, hooknum) and revalidate if the chain becomes reachable from a different hook location.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09d6074995c186e449979fe6c1b0f1a69cf9bd3bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/14fa3d1927f1382f86e3f70a51f26005c8e3cff6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/53de1e6cde8f9b791d9cf61aa0e7b02cf5bbe8b1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8e1a1bc4f5a42747c08130b8242ebebd1210b32fPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.19
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: avoid chain re-validation if possible\n\nHamza Mahfooz reports cpu soft lock-ups in\nnft_chain_validate():\n\n watchdog: BUG: soft lockup - CPU#1 stuck for 27s! [iptables-nft-re:37547]\n[..]\n RIP: 0010:nft_chain_validate+0xcb/0x110 [nf_tables]\n[..]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_table_validate+0x6b/0xb0 [nf_tables]\n  nf_tables_validate+0x8b/0xa0 [nf_tables]\n  nf_tables_commit+0x1df/0x1eb0 [nf_tables]\n[..]\n\nCurrently nf_tables will traverse the entire table (chain graph), starting\nfrom the entry points (base chains), exploring all possible paths\n(chain jumps).  But there are cases where we could avoid revalidation.\n\nConsider:\n1  input -\u003e j2 -\u003e j3\n2  input -\u003e j2 -\u003e j3\n3  input -\u003e j1 -\u003e j2 -\u003e j3\n\nThen the second rule does not need to revalidate j2, and, by extension j3,\nbecause this was already checked during validation of the first rule.\nWe need to validate it only for rule 3.\n\nThis is needed because chain loop detection also ensures we do not exceed\nthe jump stack: Just because we know that j2 is cycle free, its last jump\nmight now exceed the allowed stack size.  We also need to update all\nreachable chains with the new largest observed call depth.\n\nCare has to be taken to revalidate even if the chain depth won\u0027t be an\nissue: chain validation also ensures that expressions are not called from\ninvalid base chains.  For example, the masquerade expression can only be\ncalled from NAT postrouting base chains.\n\nTherefore we also need to keep record of the base chain context (type,\nhooknum) and revalidate if the chain becomes reachable from a different\nhook location."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnetfilter: nf_tables: evitar la revalidaci\u00f3n de cadenas si es posible\n\nHamza Mahfooz informa de bloqueos suaves de CPU en\nnft_chain_validate():\n\n watchdog: BUG: soft lockup - CPU#1 atascada durante 27s! [iptables-nft-re:37547]\n[..]\n RIP: 0010:nft_chain_validate+0xcb/0x110 [nf_tables]\n[..]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_immediate_validate+0x36/0x50 [nf_tables]\n  nft_chain_validate+0xc9/0x110 [nf_tables]\n  nft_table_validate+0x6b/0xb0 [nf_tables]\n  nf_tables_validate+0x8b/0xa0 [nf_tables]\n  nf_tables_commit+0x1df/0x1eb0 [nf_tables]\n[..]\n\nActualmente, nf_tables recorrer\u00e1 toda la tabla (grafo de cadenas), comenzando\ndesde los puntos de entrada (cadenas base), explorando todas las rutas posibles\n(saltos de cadena). Pero hay casos en los que podr\u00edamos evitar la revalidaci\u00f3n.\n\nConsidere:\n1  input -\u0026gt; j2 -\u0026gt; j3\n2  input -\u0026gt; j2 -\u0026gt; j3\n3  input -\u0026gt; j1 -\u0026gt; j2 -\u0026gt; j3\n\nEntonces la segunda regla no necesita revalidar j2, y, por extensi\u00f3n j3,\nporque esto ya fue verificado durante la validaci\u00f3n de la primera regla.\nNecesitamos validarlo solo para la regla 3.\n\nEsto es necesario porque la detecci\u00f3n de bucles de cadena tambi\u00e9n asegura que no excedamos\nla pila de saltos: Solo porque sabemos que j2 est\u00e1 libre de ciclos, su \u00faltimo salto\npodr\u00eda ahora exceder el tama\u00f1o de pila permitido. Tambi\u00e9n necesitamos actualizar todas\nlas cadenas alcanzables con la nueva profundidad de llamada m\u00e1s grande observada.\n\nSe debe tener cuidado de revalidar incluso si la profundidad de la cadena no ser\u00e1 un\nproblema: la validaci\u00f3n de la cadena tambi\u00e9n asegura que las expresiones no se llamen desde\ncadenas base inv\u00e1lidas. Por ejemplo, la expresi\u00f3n de enmascaramiento solo puede ser\nllamada desde cadenas base de postrouting NAT.\n\nPor lo tanto, tambi\u00e9n necesitamos mantener un registro del contexto de la cadena base (tipo,\nhooknum) y revalidar si la cadena se vuelve alcanzable desde una ubicaci\u00f3n de hook diferente."
    }
  ],
  "id": "CVE-2025-71160",
  "lastModified": "2026-02-26T20:19:14.993",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-01-23T16:15:52.897",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "tags": [
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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