CVE-2026-46315

Local information disclosure via uninitialized WAITID result

Published Jun 9, 2026 · Updated Jun 9, 2026

Information disclosure in io_uring WAITID in Linux Kernel allows local users to read stale kernel command-storage bytes. The io_waitid prep path leaves struct io_waitid::info uninitialized, and io_waitid_finish() copies it to userspace when common wait code leaves wo_info unwritten. A local user must submit IORING_OP_WAITID and reach a no-child-event completion; the returned siginfo discloses residual reused io_kiocb bytes.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in io_uring WAITID in Linux Kernel allows local users to read stale kernel command-storage bytes. The io_waitid prep path leaves struct io_waitid::info uninitialized, and io_waitid_finish() copies it to userspace when common wait code leaves wo_info unwritten. A local user must submit IORING_OP_WAITID and reach a no-child-event completion; the returned siginfo discloses residual reused io_kiocb bytes.

The record

CVE
CVE-2026-46315
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1106
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.7
  2. Affected versionversion=f31ecf671ddc498f20219453395794ff2383e06b <4d2a0de611ab60d02fc768ae0cd5918b16bd5474
  3. Affected versionversion=f31ecf671ddc498f20219453395794ff2383e06b <93d93f5f8da791e98159795c6ef683f45bd95d13
  4. Affected versionversion=f31ecf671ddc498f20219453395794ff2383e06b <954518e5a4a5efc5033253f6e36fc7b9f98363a3
  5. Affected versionversion=f31ecf671ddc498f20219453395794ff2383e06b <b737c6612c60c23b40a9f31749b99e6f61943847

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.7; version=f31ecf671ddc498f20219453395794ff2383e06b <4d2a0de611ab60d02fc768ae0cd5918b16bd5474; version=f31ecf671ddc498f20219453395794ff2383e06b <93d93f5f8da791e98159795c6ef683f45bd95d13; version=f31ecf671ddc498f20219453395794ff2383e06b <954518e5a4a5efc5033253f6e36fc7b9f98363a3; version=f31ecf671ddc498f20219453395794ff2383e06b <b737c6612c60c23b40a9f31749b99e6f61943847

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1106Native API

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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