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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
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-09
Advisory published
2026-06-09
Advisory updated
2026-06-09

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].

Official resources

The CVE was published and modified on 2026-06-09T09:16:30.330Z.