Vulnerability-Lookup

GHSA-3XR6-R26V-FPQM

Vulnerability from github – Published: 2026-06-09 09:32 – Updated: 2026-06-09 09:32

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46315"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-09T09:16:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/waitid: clear waitid info before copying it to userspace\n\nIORING_OP_WAITID stores its result fields in struct io_waitid::info and\nlater copies them to userspace siginfo. The prep path initializes the\nrequest arguments, but it does not initialize info itself.\n\nIf the wait operation completes without reporting a child event, the common\nwait code can return without writing wo_info. In that case io_waitid_finish()\nstill copies iw-\u003einfo to userspace, exposing stale bytes from the reused\nio_kiocb command storage.\n\nClear the result storage during prep so the io_uring path matches the\nregular waitid syscall, which uses a zero-initialized struct waitid_info.",
  "id": "GHSA-3xr6-r26v-fpqm",
  "modified": "2026-06-09T09:32:07Z",
  "published": "2026-06-09T09:32:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46315"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/954518e5a4a5efc5033253f6e36fc7b9f98363a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46315 (GCVE-0-2026-46315)

Vulnerability from cvelistv5 – Published: 2026-06-09 07:38 – Updated: 2026-06-14 18:08

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.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/954518e5a4a5efc50…
https://git.kernel.org/stable/c/b737c6612c60c23b4…
https://git.kernel.org/stable/c/4d2a0de611ab60d02…
https://git.kernel.org/stable/c/93d93f5f8da791e98…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f31ecf671ddc498f20219453395794ff2383e06b , < 954518e5a4a5efc5033253f6e36fc7b9f98363a3 (git) Affected: f31ecf671ddc498f20219453395794ff2383e06b , < b737c6612c60c23b40a9f31749b99e6f61943847 (git) Affected: f31ecf671ddc498f20219453395794ff2383e06b , < 4d2a0de611ab60d02fc768ae0cd5918b16bd5474 (git) Affected: f31ecf671ddc498f20219453395794ff2383e06b , < 93d93f5f8da791e98159795c6ef683f45bd95d13 (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "io_uring/waitid.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "954518e5a4a5efc5033253f6e36fc7b9f98363a3",
              "status": "affected",
              "version": "f31ecf671ddc498f20219453395794ff2383e06b",
              "versionType": "git"
            },
            {
              "lessThan": "b737c6612c60c23b40a9f31749b99e6f61943847",
              "status": "affected",
              "version": "f31ecf671ddc498f20219453395794ff2383e06b",
              "versionType": "git"
            },
            {
              "lessThan": "4d2a0de611ab60d02fc768ae0cd5918b16bd5474",
              "status": "affected",
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              "versionType": "git"
            }
          ]
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          "product": "Linux",
          "programFiles": [
            "io_uring/waitid.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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        }
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          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/waitid: clear waitid info before copying it to userspace\n\nIORING_OP_WAITID stores its result fields in struct io_waitid::info and\nlater copies them to userspace siginfo. The prep path initializes the\nrequest arguments, but it does not initialize info itself.\n\nIf the wait operation completes without reporting a child event, the common\nwait code can return without writing wo_info. In that case io_waitid_finish()\nstill copies iw-\u003einfo to userspace, exposing stale bytes from the reused\nio_kiocb command storage.\n\nClear the result storage during prep so the io_uring path matches the\nregular waitid syscall, which uses a zero-initialized struct waitid_info."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-14T18:08:38.384Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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      "title": "io_uring/waitid: clear waitid info before copying it to userspace",
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    "cveId": "CVE-2026-46315",
    "datePublished": "2026-06-09T07:38:13.713Z",
    "dateReserved": "2026-05-13T15:03:33.111Z",
    "dateUpdated": "2026-06-14T18:08:38.384Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

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GHSA-3XR6-R26V-FPQM

CVE-2026-46315 (GCVE-0-2026-46315)

Tags

Sightings

Nomenclature