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PatchSiren cyber security CVE debrief

CVE-2026-46315 Linux CVE debrief

A vulnerability in the Linux kernel has been identified and resolved. The issue relates to the io_uring/waitid functionality, where the waitid information is not properly cleared before being copied to userspace. This can lead to stale bytes from the reused io_kiocb command storage being exposed.

Vendor
Linux
Product
Unknown
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-08
Advisory published
2026-06-09
Advisory updated
2026-07-08

Who should care

Linux kernel developers and users who rely on the io_uring/waitid functionality should be aware of this vulnerability and take necessary steps to update their kernel to the latest version.

Technical summary

The Linux kernel vulnerability (CVE-2026-46315) is caused by the io_uring/waitid not clearing waitid information before copying it to userspace. This can result in stale bytes being exposed. The issue has been resolved by initializing the result storage during the prep path.

Defensive priority

Medium

Recommended defensive actions

  • Update the Linux kernel to the latest version to ensure the vulnerability is patched.
  • Review and apply the provided patches from the Linux kernel repository [ref-4], [ref-5], [ref-6], [ref-7].

Evidence notes

The vulnerability has been resolved in the Linux kernel. The Common Vulnerabilities and Exposures (CVE) record can be found at [cve-org]. More information is available on the National Vulnerability Database (NVD) website at [nvd].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46315 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46315

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46315 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46315

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/954518e5a4a5efc5033253f6e36fc7b9f98363a3

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.