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CVE-2023-53698

Estado: AplazadaAlta (7.8)—

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

xsk: fix refcount underflow in error path

Fix a refcount underflow problem reported by syzbot that can happen when a system is running out of memory. If xp_alloc_tx_descs() fails, and it can only fail due to not having enough memory, then the error path is triggered. In this error path, the refcount of the pool is decremented as it has incremented before. However, the reference to the pool in the socket was not nulled. This means that when the socket is closed later, the socket teardown logic will think that there is a pool attached to the socket and try to decrease the refcount again, leading to a refcount underflow.

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I chose this fix as it involved adding just a single line. Another option would have been to move xp_get_pool() and the assignment of xs->pool to after the if-statement and using xs_umem->pool instead of xs->pool in the whole if-statement resulting in somewhat simpler code, but this would have led to much more churn in the code base perhaps making it harder to backport.

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.

Vulnerabilidad local (AV:L, PR:L) que causa underflow de refcount en el kernel xsk. Requiere privilegio de usuario y puede resultar en DoS o corrupción de memoria ante condiciones de falta de memoria.

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)

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{
  "id": "CVE-2023-53698",
  "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": "f7019562f142bc041f9cde63af338d1886585923",
              "lessThan": "789fcd94c9cac133dd4d96e193188661aca9f6c3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ba3beec2ec1d3b4fd8672ca6e781dac4b3267f6e",
              "lessThan": "15b453cf7348973217558235b9ece2ee5fea6777",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ba3beec2ec1d3b4fd8672ca6e781dac4b3267f6e",
              "lessThan": "3e7722c31d4167eb7f3ffd35aba52cab69b79072",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ba3beec2ec1d3b4fd8672ca6e781dac4b3267f6e",
              "lessThan": "85c2c79a07302fe68a1ad5cc449458cc559e314d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9f0c8a9d4ef1b9ebee0e4ac2495fe790727044aa",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.15.47",
              "lessThan": "5.15.127",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.17.15",
              "lessThan": "5.18",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/xdp/xsk.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.127",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.46",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.4.11",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/xdp/xsk.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-10-22T14:15:44.330",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/15b453cf7348973217558235b9ece2ee5fea6777",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3e7722c31d4167eb7f3ffd35aba52cab69b79072",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/789fcd94c9cac133dd4d96e193188661aca9f6c3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/85c2c79a07302fe68a1ad5cc449458cc559e314d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: fix refcount underflow in error path\n\nFix a refcount underflow problem reported by syzbot that can happen\nwhen a system is running out of memory. If xp_alloc_tx_descs() fails,\nand it can only fail due to not having enough memory, then the error\npath is triggered. In this error path, the refcount of the pool is\ndecremented as it has incremented before. However, the reference to\nthe pool in the socket was not nulled. This means that when the socket\nis closed later, the socket teardown logic will think that there is a\npool attached to the socket and try to decrease the refcount again,\nleading to a refcount underflow.\n\nI chose this fix as it involved adding just a single line. Another\noption would have been to move xp_get_pool() and the assignment of\nxs->pool to after the if-statement and using xs_umem->pool instead of\nxs->pool in the whole if-statement resulting in somewhat simpler code,\nbut this would have led to much more churn in the code base perhaps\nmaking it harder to backport."
    }
  ],
  "lastModified": "2026-08-04T10:19:18.413",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}