CVE-2026-46315
io_uring/waitid: clear waitid info before copying it to userspace
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.
INFO
Published Date :
June 9, 2026, 9:16 a.m.
Last Modified :
July 23, 2026, 8:10 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Apply Linux kernel patches for io_uring/waitid.
- Ensure waitid info is zero-initialized during prep.
- Validate io_uring path matches regular waitid syscall.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-46315.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-46315 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-46315
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-46315 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-46315 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: Linux, Description: En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: io_uring/waitid: limpiar la información de waitid antes de copiarla al espacio de usuario IORING_OP_WAITID almacena sus campos de resultado en la estructura io_waitid::info y luego los copia a siginfo del espacio de usuario. La ruta de preparación inicializa los argumentos de la solicitud, pero no inicializa la propia información. Si la operación de espera se completa sin informar un evento hijo, el código de espera común puede regresar sin escribir wo_info. En ese caso, io_waitid_finish() todavía copia iw->info al espacio de usuario, exponiendo bytes obsoletos del almacenamiento de comandos io_kiocb reutilizado. Limpiar el almacenamiento de resultados durante la preparación para que la ruta de io_uring coincida con la llamada al sistema waitid regular, que utiliza una estructura waitid_info inicializada a cero. -
Initial Analysis by [email protected]
Jul. 08, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.92 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.34 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.11 Added Reference Type kernel.org: https://git.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/954518e5a4a5efc5033253f6e36fc7b9f98363a3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'f31ecf671ddc498f20219453395794ff2383e06b', 'lessThan': '954518e5a4a5efc5033253f6e36fc7b9f98363a3', 'versionType': 'git'}, {'status': 'affected', 'version': 'f31ecf671ddc498f20219453395794ff2383e06b', 'lessThan': 'b737c6612c60c23b40a9f31749b99e6f61943847', 'versionType': 'git'}, {'status': 'affected', 'version': 'f31ecf671ddc498f20219453395794ff2383e06b', 'lessThan': '4d2a0de611ab60d02fc768ae0cd5918b16bd5474', 'versionType': 'git'}, {'status': 'affected', 'version': 'f31ecf671ddc498f20219453395794ff2383e06b', 'lessThan': '93d93f5f8da791e98159795c6ef683f45bd95d13', 'versionType': 'git'}], 'programFiles': ['io_uring/waitid.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.7'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.7', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['io_uring/waitid.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 09, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/4d2a0de611ab60d02fc768ae0cd5918b16bd5474 Added Reference https://git.kernel.org/stable/c/93d93f5f8da791e98159795c6ef683f45bd95d13 Added Reference https://git.kernel.org/stable/c/954518e5a4a5efc5033253f6e36fc7b9f98363a3 Added Reference https://git.kernel.org/stable/c/b737c6612c60c23b40a9f31749b99e6f61943847