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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
f31ecf671ddc498f20219453395794ff2383e06b to < 954518e5a4a5efc5033253f6e36fc7b9f98363a3affectedf31ecf671ddc498f20219453395794ff2383e06b to < b737c6612c60c23b40a9f31749b99e6f61943847affectedf31ecf671ddc498f20219453395794ff2383e06b to < 4d2a0de611ab60d02fc768ae0cd5918b16bd5474affectedf31ecf671ddc498f20219453395794ff2383e06b to < 93d93f5f8da791e98159795c6ef683f45bd95d13affected
Linux Linux
Default version status: affected
6.7affected0 to < 6.7unaffected6.12.92 to ≤ 6.12.*unaffected6.18.34 to ≤ 6.18.*unaffected7.0.11 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected