UBUNTU-CVE-2026-46315
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.
02 / AFFECTED SOFTWARE
Affected packages
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1 explicit affected versions
7 explicit affected versions
13 explicit affected versions
43 explicit affected versions
16 explicit affected versions
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48 explicit affected versions
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78 explicit affected versions
14 explicit affected versions
11 explicit affected versions
1 explicit affected versions
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41 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/93d93f5f8da791e98159795c6ef683f45bd95d13
- https://git.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474
- https://git.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13
- https://git.kernel.org/stable/c/954518e5a4a5efc5033253f6e36fc7b9f98363a3
- https://git.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847
- https://ubuntu.com/security/CVE-2026-46315
- https://ubuntu.com/security/notices/USN-8566-1
- https://ubuntu.com/security/notices/USN-8568-1
- https://ubuntu.com/security/notices/USN-8569-1
- https://ubuntu.com/security/notices/USN-8593-1
- https://ubuntu.com/security/notices/USN-8603-1
- https://ubuntu.com/security/notices/USN-8618-1
- https://www.cve.org/CVERecord?id=CVE-2026-46315