« Volver al listado

CVE-2025-68325

Estado: AplazadaSin puntuar—

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

net/sched: sch_cake: Fix incorrect qlen reduction in cake_drop

In cake_drop(), qdisc_tree_reduce_backlog() is used to update the qlen and backlog of the qdisc hierarchy. Its caller, cake_enqueue(), assumes that the parent qdisc will enqueue the current packet. However, this assumption breaks when cake_enqueue() returns NET_XMIT_CN: the parent qdisc stops enqueuing current packet, leaving the tree qlen/backlog accounting inconsistent. This mismatch can lead to a NULL dereference (e.g., when the parent Qdisc is qfq_qdisc).

This patch computes the qlen/backlog delta in a more robust way by observing the difference before and after the series of cake_drop() calls, and then compensates the qdisc tree accounting if cake_enqueue() returns NET_XMIT_CN.

Leer descripción completaMostrar menos

To ensure correct compensation when ACK thinning is enabled, a new variable is introduced to keep qlen unchanged.

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-2025-68325",
  "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": "de04ddd2980b48caa8d7e24a7db2742917a8b280",
              "lessThan": "a3f4e3de41a3f115db35276c6b186ccbc913934a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0dacfc5372e314d1219f03e64dde3ab495a5a25e",
              "lessThan": "38abf6e931b169ea88d7529b49096f53a5dcf8fe",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "710866fc0a64eafcb8bacd91bcb1329eb7e5035f",
              "lessThan": "fcb91be52eb6e92e00b533ebd7c77fecada537e1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aa12ee1c1bd260943fd6ab556d8635811c332eeb",
              "lessThan": "d01f0e072dadb02fe10f436b940dd957aff0d7d4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ff57186b2cc39766672c4c0332323933e5faaa88",
              "lessThan": "0b6216f9b3d1c33c76f74511026e5de5385ee520",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "15de71d06a400f7fdc15bf377a2552b0ec437cf5",
              "lessThan": "529c284cc2815c8350860e9a31722050fe7117cb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "15de71d06a400f7fdc15bf377a2552b0ec437cf5",
              "lessThan": "3ed6c458530a547ed0c9ea0b02b19bab620be88b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "15de71d06a400f7fdc15bf377a2552b0ec437cf5",
              "lessThan": "9fefc78f7f02d71810776fdeb119a05a946a27cc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "7689ab22de36f8db19095f6bdf11f28cfde92f5c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "62d591dde4defb1333d202410609c4ddeae060b3",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.10.241",
              "lessThan": "5.10.248",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.15.190",
              "lessThan": "5.15.198",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.1.149",
              "lessThan": "6.1.160",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.6.103",
              "lessThan": "6.6.120",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.44",
              "lessThan": "6.12.63",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "5.4.297",
              "lessThan": "5.5",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.16.4",
              "lessThan": "6.17",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "net/sched/sch_cake.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.248",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.63",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.17.13",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.2",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/sched/sch_cake.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-18T15:16:06.320",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0b6216f9b3d1c33c76f74511026e5de5385ee520",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/38abf6e931b169ea88d7529b49096f53a5dcf8fe",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/3ed6c458530a547ed0c9ea0b02b19bab620be88b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/529c284cc2815c8350860e9a31722050fe7117cb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9fefc78f7f02d71810776fdeb119a05a946a27cc",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a3f4e3de41a3f115db35276c6b186ccbc913934a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d01f0e072dadb02fe10f436b940dd957aff0d7d4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fcb91be52eb6e92e00b533ebd7c77fecada537e1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_cake: Fix incorrect qlen reduction in cake_drop\n\nIn cake_drop(), qdisc_tree_reduce_backlog() is used to update the qlen\nand backlog of the qdisc hierarchy. Its caller, cake_enqueue(), assumes\nthat the parent qdisc will enqueue the current packet. However, this\nassumption breaks when cake_enqueue() returns NET_XMIT_CN: the parent\nqdisc stops enqueuing current packet, leaving the tree qlen/backlog\naccounting inconsistent. This mismatch can lead to a NULL dereference\n(e.g., when the parent Qdisc is qfq_qdisc).\n\nThis patch computes the qlen/backlog delta in a more robust way by\nobserving the difference before and after the series of cake_drop()\ncalls, and then compensates the qdisc tree accounting if cake_enqueue()\nreturns NET_XMIT_CN.\n\nTo ensure correct compensation when ACK thinning is enabled, a new\nvariable is introduced to keep qlen unchanged."
    }
  ],
  "lastModified": "2026-06-17T09:58:56.250",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}