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

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

https://cvefeed.io/rssfeed/latest.atom / Tue, 06/09/2026 - 11:28
CVE ID :CVE-2026-46315
Published : June 9, 2026, 7:38 a.m. | 1 hour, 27 minutes ago
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.
Severity: 0.0 | NA
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