Bug 2406758 (CVE-2025-40047)

Summary:	CVE-2025-40047 kernel: io_uring/waitid: always prune wait queue entry in io_waitid_wait()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw use after free in the Linux kernel IO_URING subsystem was found in the way local user uses io_uring interface (using IORING_OP_WAITID). A local user could use this flaw to crash the system or potentially escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2025-10-28 12:03:55 UTC

In the Linux kernel, the following vulnerability has been resolved:

io_uring/waitid: always prune wait queue entry in io_waitid_wait()

For a successful return, always remove our entry from the wait queue
entry list. Previously this was skipped if a cancelation was in
progress, but this can race with another invocation of the wait queue
entry callback.

Comment 1 Jon Moroney 2025-10-28 18:27:49 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025102813-CVE-2025-40047-b952@gregkh/T

Comment 4 errata-xmlrpc 2025-11-17 09:26:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:21469 https://access.redhat.com/errata/RHSA-2025:21469

Comment 5 errata-xmlrpc 2025-11-24 10:21:13 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2025:21933 https://access.redhat.com/errata/RHSA-2025:21933

Comment 6 errata-xmlrpc 2025-12-08 14:42:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:22854 https://access.redhat.com/errata/RHSA-2025:22854

Comment 10 errata-xmlrpc 2026-02-02 15:25:16 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:1727 https://access.redhat.com/errata/RHSA-2026:1727