Vulnerability-Lookup

GHSA-2VH6-G7PQ-9FGV

Vulnerability from github – Published: 2026-05-28 12:30 – Updated: 2026-06-11 03:30

Details

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

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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  "affected": [],
  "aliases": [
    "CVE-2026-46182"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T10:16:33Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-2vh6-g7pq-9fgv",
  "modified": "2026-06-11T03:30:23Z",
  "published": "2026-05-28T12:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46182"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0479b6e9f999cc1cbad7d9f09f574fc387e605d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cefeed44296261173a806bef988b26bc565da4be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f88f8e4485b437e0a2f96a7ff1f88aa22d925659"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-46182 (GCVE-0-2026-46182)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-06-14 18:00

Title

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

Summary

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

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/0479b6e9f999cc1cb…
https://git.kernel.org/stable/c/f88f8e4485b437e0a…
https://git.kernel.org/stable/c/cefeed44296261173…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 , < 0479b6e9f999cc1cbad7d9f09f574fc387e605d5 (git) Affected: cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 , < f88f8e4485b437e0a2f96a7ff1f88aa22d925659 (git) Affected: cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86 , < cefeed44296261173a806bef988b26bc565da4be (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/powerpc/platforms/pseries/papr-hvpipe.c"
          ],
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              "versionType": "git"
            }
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        },
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "6.18"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
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          "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."
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    "datePublished": "2026-05-28T09:36:35.528Z",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-2VH6-G7PQ-9FGV

CVE-2026-46182 (GCVE-0-2026-46182)

Tags

Sightings

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