Bug 2467019 (CVE-2026-43074)

Summary:	CVE-2026-43074 kernel: eventpoll: defer struct eventpoll free to RCU grace period
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	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's `eventpoll` component. In certain situations, the `ep_free()` function in `eventpoll.c` can prematurely free the `eventpoll` data structure while it is still being used by another concurrent thread. This use-after-free (UAF) vulnerability could allow a local attacker to cause a denial of service or potentially escalate privileges.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-06 10:03:27 UTC

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

eventpoll: defer struct eventpoll free to RCU grace period

In certain situations, ep_free() in eventpoll.c will kfree the epi->ep
eventpoll struct while it still being used by another concurrent thread.
Defer the kfree() to an RCU callback to prevent UAF.

Comment 1 Alexander B 2026-05-06 13:29:11 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050601-CVE-2026-43074-ac01@gregkh/T

Comment 5 errata-xmlrpc 2026-07-07 09:36:27 UTC

This issue has been addressed in the following products:

  NVIDIA for RHEL 10

Via RHSA-2026:36186 https://access.redhat.com/errata/RHSA-2026:36186

Comment 6 errata-xmlrpc 2026-07-08 05:04:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:36541 https://access.redhat.com/errata/RHSA-2026:36541

Comment 7 errata-xmlrpc 2026-07-08 11:36:30 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:36645 https://access.redhat.com/errata/RHSA-2026:36645

Comment 8 errata-xmlrpc 2026-07-10 12:51:52 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:37729 https://access.redhat.com/errata/RHSA-2026:37729

Comment 9 errata-xmlrpc 2026-07-13 12:50:39 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:38902 https://access.redhat.com/errata/RHSA-2026:38902