CVE-2026-46315
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
36/100
Published: 2026-06-09
Modified: 2026-11-06
First seen: 2026-11-06
Status: active
Attack Surface
Low Complexity
No Interaction
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
Low
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
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.
Affected Software (10)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | f31ecf671ddc498f20219453395794ff2383e06b < 954518e5a4a5efc5033253f6e36fc7b9f98363a3 |
| Linux | Linux | f31ecf671ddc498f20219453395794ff2383e06b < b737c6612c60c23b40a9f31749b99e6f61943847 |
| Linux | Linux | f31ecf671ddc498f20219453395794ff2383e06b < 4d2a0de611ab60d02fc768ae0cd5918b16bd5474 |
| Linux | Linux | f31ecf671ddc498f20219453395794ff2383e06b < 93d93f5f8da791e98159795c6ef683f45bd95d13 |
| Linux | Linux | 6.7 |
| linux | linux_kernel | 6.7 – 6.12.92 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |