io_uring/waitid: clear waitid info before copying it to userspace

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Summary

CVECVE-2026-46315
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-09 09:16:30 UTC
Updated2026-06-09 09:16:30 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f31ecf671ddc498f20219453395794ff2383e06b 954518e5a4a5efc5033253f6e36fc7b9f98363a3 git Not specified
CNA Linux Linux affected f31ecf671ddc498f20219453395794ff2383e06b b737c6612c60c23b40a9f31749b99e6f61943847 git Not specified
CNA Linux Linux affected f31ecf671ddc498f20219453395794ff2383e06b 4d2a0de611ab60d02fc768ae0cd5918b16bd5474 git Not specified
CNA Linux Linux affected f31ecf671ddc498f20219453395794ff2383e06b 93d93f5f8da791e98159795c6ef683f45bd95d13 git Not specified
CNA Linux Linux affected 6.7 Not specified
CNA Linux Linux unaffected 6.7 semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/954518e5a4a5efc5033253f6e36fc7b9f98363a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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