CVE-2026-46315 io_uring/waitid: clear waitid info before copying it to userspace

What is CVE-2026-46315?

CVE-2026-46315 is a medium-severity vulnerability in Linux kernel, published on 9 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Which versions are affected by CVE-2026-46315?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-46315?

Apply the vendor's patch.

Is CVE-2026-46315 being exploited?

There is no known exploitation of CVE-2026-46315 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-46315, DEBIAN-CVE-2026-46315, GHSA-3xr6-r26v-fpqm, ROOT-OS-DEBIAN-13-CVE-2026-46315, ROOT-OS-UBUNTU-2404-CVE-2026-46315, UBUNTU-CVE-2026-46315.