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CVE-2026-46182

Full vulnerability record from the local CVENow database.

Description

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.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Analyzed
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-05-28 10:16:33.837000
Last modified
2026-11-06 17:17:42.983000
View original CVE JSON 
{
  "id": "CVE-2026-46182",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-05-28T10:16:33.837",
  "lastModified": "2026-11-06T17:17:42.983",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "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."
    }
  ],
  "affected": [
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      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "arch/powerpc/platforms/pseries/papr-hvpipe.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86",
              "lessThan": "0479b6e9f999cc1cbad7d9f09f574fc387e605d5",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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            },
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              "lessThanOrEqual": "7.0.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
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        "type": "Primary",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-11-06T16:11:21.834383Z",
          "id": "CVE-2026-46182",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
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            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
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  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ]
    }
  ],
  "configurations": [
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          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0479b6e9f999cc1cbad7d9f09f574fc387e605d5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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}