FKIE_CVE-2025-68179

Vulnerability from fkie_nvd - Published: 2025-12-16 14:15 - Updated: 2026-10-14 13:10
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: s390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP As reported by Luiz Capitulino enabling HVO on s390 leads to reproducible crashes. The problem is that kernel page tables are modified without flushing corresponding TLB entries. Even if it looks like the empty flush_tlb_all() implementation on s390 is the problem, it is actually a different problem: on s390 it is not allowed to replace an active/valid page table entry with another valid page table entry without the detour over an invalid entry. A direct replacement may lead to random crashes and/or data corruption. In order to invalidate an entry special instructions have to be used (e.g. ipte or idte). Alternatively there are also special instructions available which allow to replace a valid entry with a different valid entry (e.g. crdte or cspg). Given that the HVO code currently does not provide the hooks to allow for an implementation which is compliant with the s390 architecture requirements, disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP again, which is basically a revert of the original patch which enabled it.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5e23918e4352288323d13fb511116cdea0234b71
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/64e2f60f355e556337fcffe80b9bcff1b22c9c42
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7088465f10816d9425b95740b37c95f082041d76
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4a8238e5729505b7394ccb007e5dc3e557aa66b
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/Kconfig"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7088465f10816d9425b95740b37c95f082041d76",
              "status": "affected",
              "version": "00a34d5a99c0631bd780b14cbe3813d0b39c3886",
              "versionType": "git"
            },
            {
              "lessThan": "5e23918e4352288323d13fb511116cdea0234b71",
              "status": "affected",
              "version": "00a34d5a99c0631bd780b14cbe3813d0b39c3886",
              "versionType": "git"
            },
            {
              "lessThan": "d4a8238e5729505b7394ccb007e5dc3e557aa66b",
              "status": "affected",
              "version": "00a34d5a99c0631bd780b14cbe3813d0b39c3886",
              "versionType": "git"
            },
            {
              "lessThan": "64e2f60f355e556337fcffe80b9bcff1b22c9c42",
              "status": "affected",
              "version": "00a34d5a99c0631bd780b14cbe3813d0b39c3886",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/Kconfig"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "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\ns390: Disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP\n\nAs reported by Luiz Capitulino enabling HVO on s390 leads to reproducible\ncrashes. The problem is that kernel page tables are modified without\nflushing corresponding TLB entries.\n\nEven if it looks like the empty flush_tlb_all() implementation on s390 is\nthe problem, it is actually a different problem: on s390 it is not allowed\nto replace an active/valid page table entry with another valid page table\nentry without the detour over an invalid entry. A direct replacement may\nlead to random crashes and/or data corruption.\n\nIn order to invalidate an entry special instructions have to be used\n(e.g. ipte or idte). Alternatively there are also special instructions\navailable which allow to replace a valid entry with a different valid\nentry (e.g. crdte or cspg).\n\nGiven that the HVO code currently does not provide the hooks to allow for\nan implementation which is compliant with the s390 architecture\nrequirements, disable ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP again, which is\nbasically a revert of the original patch which enabled it."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ns390: Deshabilitar ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP\n\nSeg\u00fan lo informado por Luiz Capitulino, habilitar HVO en s390 conduce a fallos reproducibles. El problema es que las tablas de p\u00e1ginas del kernel se modifican sin vaciar las entradas TLB correspondientes.\n\nAunque parezca que la implementaci\u00f3n vac\u00eda de flush_tlb_all() en s390 es el problema, en realidad es un problema diferente: en s390 no est\u00e1 permitido reemplazar una entrada de tabla de p\u00e1ginas activa/v\u00e1lida con otra entrada de tabla de p\u00e1ginas v\u00e1lida sin el desv\u00edo a trav\u00e9s de una entrada inv\u00e1lida. Un reemplazo directo puede conducir a fallos aleatorios y/o corrupci\u00f3n de datos.\n\nPara invalidar una entrada se deben usar instrucciones especiales (p. ej., ipte o idte). Alternativamente, tambi\u00e9n hay instrucciones especiales disponibles que permiten reemplazar una entrada v\u00e1lida con una entrada v\u00e1lida diferente (p. ej., crdte o cspg).\n\nDado que el c\u00f3digo HVO actualmente no proporciona los \u0027hooks\u0027 para permitir una implementaci\u00f3n que cumpla con los requisitos de la arquitectura s390, se deshabilita ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP de nuevo, lo cual es b\u00e1sicamente una reversi\u00f3n del parche original que lo habilit\u00f3."
    }
  ],
  "id": "CVE-2025-68179",
  "lastModified": "2026-10-14T13:10:00.187",
  "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"
      }
    ]
  },
  "published": "2025-12-16T14:15:49.873",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5e23918e4352288323d13fb511116cdea0234b71"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/64e2f60f355e556337fcffe80b9bcff1b22c9c42"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7088465f10816d9425b95740b37c95f082041d76"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d4a8238e5729505b7394ccb007e5dc3e557aa66b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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