Linux Kernel io_uring WaitID Stale Data Exposure (CVE-2026-46315)
CVE-2026-46315 Published on June 9, 2026
io_uring/waitid: clear waitid info before copying it to userspace
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.
Products Associated with CVE-2026-46315
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Affected Versions
Linux:- Version f31ecf671ddc498f20219453395794ff2383e06b and below 954518e5a4a5efc5033253f6e36fc7b9f98363a3 is affected.
- Version f31ecf671ddc498f20219453395794ff2383e06b and below b737c6612c60c23b40a9f31749b99e6f61943847 is affected.
- Version f31ecf671ddc498f20219453395794ff2383e06b and below 4d2a0de611ab60d02fc768ae0cd5918b16bd5474 is affected.
- Version f31ecf671ddc498f20219453395794ff2383e06b and below 93d93f5f8da791e98159795c6ef683f45bd95d13 is affected.
- Version 6.7 is affected.
- Before 6.7 is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1-rc5, <= * is unaffected.