Bug 2540323 (CVE-2026-93262)

Summary:	CVE-2026-93262 kernel: md/raid5-ppl: fix use-after-free in ppl_do_flush()
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:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, 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. A local attacker can cause a Denial of Service (DoS) or potentially escalate privileges through a use-after-free vulnerability in the RAID-5 Partial Parity Log (PPL) component. During flush operations, the system improperly continues to access an input/output (I/O) tracking structure after it has already been released. This memory corruption can destabilize the operating system and cause the kernel to crash.	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 2026-09-24 16:20:47 UTC

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

md/raid5-ppl: fix use-after-free in ppl_do_flush()

The loop in ppl_do_flush() continues iterating after calling
ppl_io_unit_finished(), touching io->pending_flushes and leading to a
use-after-free.

Add a break statement to stop the loop once io is freed.

Comment 1 gkamathe 2026-09-28 11:10:10 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93262.mbox

Comment 3 Jon Orris 2026-10-14 21:10:12 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:83157 https://access.redhat.com/errata/RHSA-2026:83157

Comment 4 Jon Orris 2026-10-14 21:11:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:83159 https://access.redhat.com/errata/RHSA-2026:83159