io_uring/waitid: clear waitid info before copying it to userspace

{
  "id": "17f11c8dff947654311385f9b6a13a9ff6e68a00418401f74936603e2b025f07",
  "url": "https://osv.dev/vulnerability/CVE-2026-46315",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "io_uring/waitid: clear waitid info before copying it to userspace",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: io_uring/waitid: clear waitid info before copying it to userspace IORING_OP_WAITID stores its result fields in struct io_waitid::info and later copies them to userspace siginfo. The prep path initializes the request arguments, but it does not initialize info itself. If the wait operation completes without reporting a child event, the common wait code can return without writing wo_info. In that case io_waitid_finish() still copies iw->info to userspace, exposing stale bytes from the reused io_kiocb command storage. Clear the result storage during prep so the io_uring path matches the regular waitid syscall, which uses a zero-initialized struct waitid_info.",
    "evidence": "osv:CVE-2026-46315",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.92",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-46315",
      "aliases": [
        "CVE-2026-46315"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f31ecf671ddc498f20219453395794ff2383e06b"
                },
                {
                  "fixed": "954518e5a4a5efc5033253f6e36fc7b9f98363a3"
                },
                {
                  "fixed": "b737c6612c60c23b40a9f31749b99e6f61943847"
                },
                {
                  "fixed": "4d2a0de611ab60d02fc768ae0cd5918b16bd5474"
                },
                {
                  "fixed": "93d93f5f8da791e98159795c6ef683f45bd95d13"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46315.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.92"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.34"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46315.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.385160361Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474",
        "https://git.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13",
        "https://git.kernel.org/stable/c/954518e5a4a5efc5033253f6e36fc7b9f98363a3",
        "https://git.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46315.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-46315",
        "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-2026-46315.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-46315",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 489377,
  "published_at": "2026-06-09T07:38:13.713+00:00"
}