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CVE-2023-54200

Estado: AplazadaAlta (7.8)—

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

netfilter: nf_tables: always release netdev hooks from notifier

This reverts "netfilter: nf_tables: skip netdev events generated on netns removal".

The problem is that when a veth device is released, the veth release callback will also queue the peer netns device for removal.

Its possible that the peer netns is also slated for removal. In this case, the device memory is already released before the pre_exit hook of the peer netns runs:

Order is: 1. First netns is released, veth_dellink() queues peer netns device for removal 2. peer netns is queued for removal 3. peer netns device is released, unreg event is triggered 4. unreg event is ignored because netns is going down 5. pre_exit hook calls nft_netdev_unregister_hooks but device memory might be free'd already.

Detalles técnicos trazas, registros y código del informe original
BUG: KASAN: slab-use-after-free in nf_hook_entry_head+0x1b8/0x1d0
Read of size 8 at addr ffff88812c0124f0 by task kworker/u8:1/45
Workqueue: netns cleanup_net
Call Trace:
 nf_hook_entry_head+0x1b8/0x1d0
 __nf_unregister_net_hook+0x76/0x510
 nft_netdev_unregister_hooks+0xa0/0x220
 __nft_release_hook+0x184/0x490
 nf_tables_pre_exit_net+0x12f/0x1b0
 ..

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso local sin interacción (AV:L, PR:L, UI:N) permite escalada de privilegios mediante liberación de memoria no segura en netfilter; causa DoS por use-after-free e impacta integridad de kernel.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2023-54200",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "68a3765c659f809dcaac20030853a054646eb739",
              "lessThan": "8d56f00c61f67b450fbbdcb874855e60ad92c560",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "68a3765c659f809dcaac20030853a054646eb739",
              "lessThan": "30e4b13b1bfbdf3bf3b27036d8209ea1b9f0d880",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "68a3765c659f809dcaac20030853a054646eb739",
              "lessThan": "94032527efbac13be702c76afb9d872c0cca7a43",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "68a3765c659f809dcaac20030853a054646eb739",
              "lessThan": "dc1c9fd4a8bbe1e06add9053010b652449bfe411",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "90c7c58aa2bd02c65a4c63b7dfe0b16eab12cf9f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.14.15",
              "lessThan": "5.15",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/netfilter/nft_chain_filter.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.113",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.30",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.3.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.3.*"
            },
            {
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/netfilter/nft_chain_filter.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-30T13:16:08.100",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/30e4b13b1bfbdf3bf3b27036d8209ea1b9f0d880",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8d56f00c61f67b450fbbdcb874855e60ad92c560",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/94032527efbac13be702c76afb9d872c0cca7a43",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dc1c9fd4a8bbe1e06add9053010b652449bfe411",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: always release netdev hooks from notifier\n\nThis reverts \"netfilter: nf_tables: skip netdev events generated on netns removal\".\n\nThe problem is that when a veth device is released, the veth release\ncallback will also queue the peer netns device for removal.\n\nIts possible that the peer netns is also slated for removal.  In this\ncase, the device memory is already released before the pre_exit hook of\nthe peer netns runs:\n\nBUG: KASAN: slab-use-after-free in nf_hook_entry_head+0x1b8/0x1d0\nRead of size 8 at addr ffff88812c0124f0 by task kworker/u8:1/45\nWorkqueue: netns cleanup_net\nCall Trace:\n nf_hook_entry_head+0x1b8/0x1d0\n __nf_unregister_net_hook+0x76/0x510\n nft_netdev_unregister_hooks+0xa0/0x220\n __nft_release_hook+0x184/0x490\n nf_tables_pre_exit_net+0x12f/0x1b0\n ..\n\nOrder is:\n1. First netns is released, veth_dellink() queues peer netns device\n   for removal\n2. peer netns is queued for removal\n3. peer netns device is released, unreg event is triggered\n4. unreg event is ignored because netns is going down\n5. pre_exit hook calls nft_netdev_unregister_hooks but device memory\n   might be free'd already."
    }
  ],
  "lastModified": "2026-08-04T11:16:36.257",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}