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

{
  "id": "d5aca8d50ba8906598e9854f441311ba753dd947b5b6e30291319f1a33c89994",
  "url": "https://osv.dev/vulnerability/CVE-2026-46182",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-46182",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.30",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-46182",
      "aliases": [
        "CVE-2026-46182"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "cebdb522fd3edd1fe05f7b4a74a27da7dd0f8d86"
                },
                {
                  "fixed": "0479b6e9f999cc1cbad7d9f09f574fc387e605d5"
                },
                {
                  "fixed": "f88f8e4485b437e0a2f96a7ff1f88aa22d925659"
                },
                {
                  "fixed": "cefeed44296261173a806bef988b26bc565da4be"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46182.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
                },
                {
                  "fixed": "6.18.30"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46182.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.876983007Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0479b6e9f999cc1cbad7d9f09f574fc387e605d5",
        "https://git.kernel.org/stable/c/cefeed44296261173a806bef988b26bc565da4be",
        "https://git.kernel.org/stable/c/f88f8e4485b437e0a2f96a7ff1f88aa22d925659",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46182.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-46182",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46182.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-46182",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 499826,
  "published_at": "2026-05-28T09:36:35.528+00:00"
}