🛡️ CVE-2026-46315 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-46315 is recorded against 3 packages.

  • kernel (from 6.19.0 up to 7.0.11)
  • linux-kernel
  • unknown

Timeline and source

Published on 9 June 2026 and last revised on 25 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-46315 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-06-09
Updated 2026-08-12
Modified 2026-07-25

Affected Packages

Software From version Fixed in
kernel 6.19.0 7.0.11
linux-kernel — —
unknown — —

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