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CVE-2023-53200

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

netfilter: x_tables: fix percpu counter block leak on error path when creating new netns

Here is the stack where we allocate percpu counter block:

And it can be leaked on this code path:

there is no freeing of the counter block on xt_register_table fail. Note: xt_percpu_counter_free should be called to free it like we do in do_replace through cleanup_entry helper (or in __ip6t_unregister_table).

Probability of hitting this error path is low AFAICS (xt_register_table can only return ENOMEM here, as it is not replacing anything, as we are creating new netns, and it is hard to imagine that all previous allocations succeeded and after that one in xt_register_table failed).

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But it's worth fixing even the rare leak.

Detalles técnicos trazas, registros y código del informe original
  +-< __alloc_percpu
    +-< xt_percpu_counter_alloc
      +-< find_check_entry # {arp,ip,ip6}_tables.c
        +-< translate_table

  +-> ip6t_register_table
    +-> translate_table # allocates percpu counter block
    +-> xt_register_table # fails

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2023-53200",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
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          "vendor": "Linux",
          "product": "Linux",
          "versions": [
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              "versionType": "git"
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              "lessThan": "3cc9610a87b7dde82f7360dd4eb6c2c27940ed57",
              "versionType": "git"
            },
            {
              "status": "affected",
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              "lessThan": "0af8c09c896810879387decfba8c942994bb61f5",
              "versionType": "git"
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          ],
          "programFiles": [
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            "net/ipv4/netfilter/ip_tables.c",
            "net/ipv6/netfilter/ip6_tables.c"
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          "defaultStatus": "unaffected"
        },
        {
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          "versions": [
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            },
            {
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            },
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              "version": "5.15.100",
              "versionType": "semver",
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            },
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              "version": "6.1.18",
              "versionType": "semver",
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            },
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              "version": "6.2.5",
              "versionType": "semver",
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            },
            {
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              "version": "6.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/ipv4/netfilter/arp_tables.c",
            "net/ipv4/netfilter/ip_tables.c",
            "net/ipv6/netfilter/ip6_tables.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-09-15T15:15:46.400",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0af8c09c896810879387decfba8c942994bb61f5",
      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
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      "tags": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: fix percpu counter block leak on error path when creating new netns\n\nHere is the stack where we allocate percpu counter block:\n\n  +-< __alloc_percpu\n    +-< xt_percpu_counter_alloc\n      +-< find_check_entry # {arp,ip,ip6}_tables.c\n        +-< translate_table\n\nAnd it can be leaked on this code path:\n\n  +-> ip6t_register_table\n    +-> translate_table # allocates percpu counter block\n    +-> xt_register_table # fails\n\nthere is no freeing of the counter block on xt_register_table fail.\nNote: xt_percpu_counter_free should be called to free it like we do in\ndo_replace through cleanup_entry helper (or in __ip6t_unregister_table).\n\nProbability of hitting this error path is low AFAICS (xt_register_table\ncan only return ENOMEM here, as it is not replacing anything, as we are\ncreating new netns, and it is hard to imagine that all previous\nallocations succeeded and after that one in xt_register_table failed).\nBut it's worth fixing even the rare leak."
    }
  ],
  "lastModified": "2026-06-17T06:44:29.517",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "597EA373-48DF-4357-AABE-E932074EE4EB",
              "versionEndExcluding": "5.15.100",
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              "versionEndExcluding": "6.1.18",
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              "matchCriteriaId": "0575B33B-A320-4E51-84CA-10C937341E02",
              "versionEndExcluding": "6.2.5",
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          ],
          "operator": "OR"
        }
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}