Bug 2389507 (CVE-2025-38568)

Summary:	CVE-2025-38568 kernel: net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
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
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2025-08-19 18:04:46 UTC

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

net/sched: mqprio: fix stack out-of-bounds write in tc entry parsing

TCA_MQPRIO_TC_ENTRY_INDEX is validated using
NLA_POLICY_MAX(NLA_U32, TC_QOPT_MAX_QUEUE), which allows the value
TC_QOPT_MAX_QUEUE (16). This leads to a 4-byte out-of-bounds stack
write in the fp[] array, which only has room for 16 elements (0–15).

Fix this by changing the policy to allow only up to TC_QOPT_MAX_QUEUE - 1.

Comment 1 Jon Moroney 2025-08-19 21:05:54 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081909-CVE-2025-38568-7cd9@gregkh/T

Comment 4 errata-xmlrpc 2026-02-02 00:46:39 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:1617 https://access.redhat.com/errata/RHSA-2026:1617

Comment 5 errata-xmlrpc 2026-02-02 09:50:32 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:1690 https://access.redhat.com/errata/RHSA-2026:1690

Comment 6 errata-xmlrpc 2026-02-02 15:25:13 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

Comment 8 errata-xmlrpc 2026-02-09 17:46:38 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:2352 https://access.redhat.com/errata/RHSA-2026:2352

Comment 9 errata-xmlrpc 2026-02-12 00:44:44 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:2594 https://access.redhat.com/errata/RHSA-2026:2594