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

Vulnerability from cvelistv5 – Published: 2026-06-09 07:38 – Updated: 2026-06-09 07:38
VLAI
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
References
Impacted products
Vendor Product Version
Linux Linux Affected: f31ecf671ddc498f20219453395794ff2383e06b , < 954518e5a4a5efc5033253f6e36fc7b9f98363a3 (git)
Affected: f31ecf671ddc498f20219453395794ff2383e06b , < b737c6612c60c23b40a9f31749b99e6f61943847 (git)
Affected: f31ecf671ddc498f20219453395794ff2383e06b , < 4d2a0de611ab60d02fc768ae0cd5918b16bd5474 (git)
Affected: f31ecf671ddc498f20219453395794ff2383e06b , < 93d93f5f8da791e98159795c6ef683f45bd95d13 (git)
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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-rc5 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "io_uring/waitid.c"
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              "operator": "OR"
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T07:38:13.713Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-46315",
    "datePublished": "2026-06-09T07:38:13.713Z",
    "dateReserved": "2026-05-13T15:03:33.111Z",
    "dateUpdated": "2026-06-09T07:38:13.713Z",
    "state": "PUBLISHED"
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      "date": "2026-06-10",
      "epss": "0.00018",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


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