« Volver al listado

CVE-2026-74735

Estado: RecibidaSin puntuar—

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

l2tp: fix tunnel and session refcount leak on seq_file release

In pppol2tp_proc_open() and l2tp_dfs_seq_open(), iteration state (pd->tunnel and pd->session) is kept in seq_file private data to allow iteration across multiple read() system calls.

However, if userspace closes /proc/net/pppol2tp or /sys/kernel/debug/l2tp/tunnels before reading to end-of-file (EOF), any tunnel or session reference stored in pd->tunnel / pd->session is left un-dropped when seq_file private data is freed.

Fix this by dropping any remaining pd->tunnel and pd->session references in pppol2tp_proc_release() and l2tp_dfs_seq_release() when closing the file.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ 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-2026-74735",
  "cveTags": [],
  "metrics": {},
  "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": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
              "lessThan": "bdf83613781956cc39798ed08321f74ab0467f4d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
              "lessThan": "8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
              "lessThan": "ebe2774e956482dd3c70b8991f6f7654356339e6",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
              "lessThan": "9006c116dd111d457bf5d074990210f70a4ad2c8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f6104e9ae04462523c372928b1173766a771ef95",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7f8e401f9e612df2a95c1ef76217c00181389bb5",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c712ed63e9b33d9a282fbd92ce25c64918c3129f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9a8863e8a8def9d88583cd9c60db38a008e6b8cf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3.16.60",
              "lessThan": "3.17",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "4.16.6",
              "lessThan": "4.17",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/l2tp/l2tp_debugfs.c",
            "net/l2tp/l2tp_ppp.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.10",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/l2tp/l2tp_debugfs.c",
            "net/l2tp/l2tp_ppp.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-26T15:16:52.057",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9006c116dd111d457bf5d074990210f70a4ad2c8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bdf83613781956cc39798ed08321f74ab0467f4d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ebe2774e956482dd3c70b8991f6f7654356339e6",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: fix tunnel and session refcount leak on seq_file release\n\nIn pppol2tp_proc_open() and l2tp_dfs_seq_open(), iteration state\n(pd->tunnel and pd->session) is kept in seq_file private data to allow\niteration across multiple read() system calls.\n\nHowever, if userspace closes /proc/net/pppol2tp or /sys/kernel/debug/l2tp/tunnels\nbefore reading to end-of-file (EOF), any tunnel or session reference stored in\npd->tunnel / pd->session is left un-dropped when seq_file private data is freed.\n\nFix this by dropping any remaining pd->tunnel and pd->session references in\npppol2tp_proc_release() and l2tp_dfs_seq_release() when closing the file."
    }
  ],
  "lastModified": "2026-09-21T14:17:20.040",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}