FKIE_CVE-2025-68208

Vulnerability from fkie_nvd - Published: 2025-12-16 14:15 - Updated: 2026-10-15 22:19
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: account for current allocated stack depth in widen_imprecise_scalars() The usage pattern for widen_imprecise_scalars() looks as follows: prev_st = find_prev_entry(env, ...); queued_st = push_stack(...); widen_imprecise_scalars(env, prev_st, queued_st); Where prev_st is an ancestor of the queued_st in the explored states tree. This ancestor is not guaranteed to have same allocated stack depth as queued_st. E.g. in the following case: def main(): for i in 1..2: foo(i) // same callsite, differnt param def foo(i): if i == 1: use 128 bytes of stack iterator based loop Here, for a second 'foo' call prev_st->allocated_stack is 128, while queued_st->allocated_stack is much smaller. widen_imprecise_scalars() needs to take this into account and avoid accessing bpf_verifier_state->frame[*]->stack out of bounds.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57e04e2ff56e32f923154f0f7bc476fcb596ffe7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64b12dca2b0abcb5fc0542887d18b926ea5cf711
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9944c7938cd5b3f37b0afec0481c7c015e4f1c58
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0c8e6d3d866b6a7f73877f71968dbffd27b7785
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/verifier.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "64b12dca2b0abcb5fc0542887d18b926ea5cf711",
              "status": "affected",
              "version": "ab470fefce2837e66b771c60858118d50bb5bb10",
              "versionType": "git"
            },
            {
              "lessThan": "9944c7938cd5b3f37b0afec0481c7c015e4f1c58",
              "status": "affected",
              "version": "2793a8b015f7f1caadb9bce9c63dc659f7522676",
              "versionType": "git"
            },
            {
              "lessThan": "57e04e2ff56e32f923154f0f7bc476fcb596ffe7",
              "status": "affected",
              "version": "2793a8b015f7f1caadb9bce9c63dc659f7522676",
              "versionType": "git"
            },
            {
              "lessThan": "b0c8e6d3d866b6a7f73877f71968dbffd27b7785",
              "status": "affected",
              "version": "2793a8b015f7f1caadb9bce9c63dc659f7522676",
              "versionType": "git"
            },
            {
              "lessThan": "6.6.117",
              "status": "affected",
              "version": "6.6.15",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/verifier.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: account for current allocated stack depth in widen_imprecise_scalars()\n\nThe usage pattern for widen_imprecise_scalars() looks as follows:\n\n    prev_st = find_prev_entry(env, ...);\n    queued_st = push_stack(...);\n    widen_imprecise_scalars(env, prev_st, queued_st);\n\nWhere prev_st is an ancestor of the queued_st in the explored states\ntree. This ancestor is not guaranteed to have same allocated stack\ndepth as queued_st. E.g. in the following case:\n\n    def main():\n      for i in 1..2:\n        foo(i)        // same callsite, differnt param\n\n    def foo(i):\n      if i == 1:\n        use 128 bytes of stack\n      iterator based loop\n\nHere, for a second \u0027foo\u0027 call prev_st-\u003eallocated_stack is 128,\nwhile queued_st-\u003eallocated_stack is much smaller.\nwiden_imprecise_scalars() needs to take this into account and avoid\naccessing bpf_verifier_state-\u003eframe[*]-\u003estack out of bounds."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbpf: tener en cuenta la profundidad actual de la pila asignada en widen_imprecise_scalars()\n\nEl patr\u00f3n de uso para widen_imprecise_scalars() es el siguiente:\n\n    prev_st = find_prev_entry(env, ...);\n    queued_st = push_stack(...);\n    widen_imprecise_scalars(env, prev_st, queued_st);\n\nDonde prev_st es un ancestro de queued_st en el \u00e1rbol de estados explorados. No se garantiza que este ancestro tenga la misma profundidad de pila asignada que queued_st. Por ejemplo, en el siguiente caso:\n\n    def main():\n      for i in 1..2:\n        foo(i)        // mismo sitio de llamada, par\u00e1metro diferente\n\n    def foo(i):\n      if i == 1:\n        usar 128 bytes de pila\n      bucle basado en iterador\n\nAqu\u00ed, para una segunda llamada a \u0027foo\u0027, prev_st -\u003e allocated_stack es 128, mientras que queued_st -\u003e allocated_stack es mucho menor. widen_imprecise_scalars() necesita tener esto en cuenta y evitar acceder a bpf_verifier_state -\u003e frame[*] -\u003e stack fuera de los l\u00edmites."
    }
  ],
  "id": "CVE-2025-68208",
  "lastModified": "2026-10-15T22:19:10.613",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-68208",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-15T22:00:14.254468Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-12-16T14:15:53.700",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/57e04e2ff56e32f923154f0f7bc476fcb596ffe7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64b12dca2b0abcb5fc0542887d18b926ea5cf711"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9944c7938cd5b3f37b0afec0481c7c015e4f1c58"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b0c8e6d3d866b6a7f73877f71968dbffd27b7785"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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