Bug 2479812 (CVE-2026-43493)

Summary:	CVE-2026-43493 kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests
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 `pcrypt` component. This vulnerability involves how the system handles certain requests, specifically `MAY_BACKLOG` requests, which can indicate a temporary busy state. If not properly managed, the system's processing of these requests could lead to resource exhaustion or instability.	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 2026-05-19 12:01:22 UTC

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

crypto: pcrypt - Fix handling of MAY_BACKLOG requests

MAY_BACKLOG requests can return EBUSY.  Handle them by checking
for that value and filtering out EINPROGRESS notifications.

Comment 1 Alexander B 2026-05-19 16:23:15 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-43493.mbox

Comment 3 errata-xmlrpc 2026-08-20 05:22:17 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:57251 https://access.redhat.com/errata/RHSA-2026:57251