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CVE-2026-46182

Estado: AnalizadaMedia (5.5)—

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

pseries/papr-hvpipe: Prevent kernel stack memory leak to userspace

The hdr variable is allocated on the stack and only hdr.version and hdr.flags are initialized explicitly. Because the struct papr_hvpipe_hdr contains reserved padding bytes (reserved[3] and reserved2[40]), these could leak the uninitialized bytes to userspace after copy_to_user().

This patch fixes that by initializing the whole struct to 0.

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-46182",
  "cveTags": [],
  "metrics": {
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        "source": "nvd@nist.gov",
        "cvssData": {
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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          "programFiles": [
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  "published": "2026-05-28T10:16:33.837",
  "references": [
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      "url": "https://git.kernel.org/stable/c/0479b6e9f999cc1cbad7d9f09f574fc387e605d5",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Primary",
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      "description": [
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          "value": "CWE-401"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npseries/papr-hvpipe: Prevent kernel stack memory leak to userspace\n\nThe hdr variable is allocated on the stack and only hdr.version and\nhdr.flags are initialized explicitly. Because the struct papr_hvpipe_hdr\ncontains reserved padding bytes (reserved[3] and reserved2[40]), these\ncould leak the uninitialized bytes to userspace after copy_to_user().\n\nThis patch fixes that by initializing the whole struct to 0."
    }
  ],
  "lastModified": "2026-06-17T10:53:13.923",
  "configurations": [
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}