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CVE-2026-46315

5.5 · MEDIUM

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…

Published Jun 9, 2026EPSS 0.11%

Overview

CVE-2026-46315 is a medium-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474Refgit.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13Refgit.kernel.org/stable/c/954518e5a4a5efc5033253f6e36fc7b9f98363a3Refgit.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46315?

CVE-2026-46315 is a medium-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-46315?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-46315?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-46315?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46315 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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