Bug 2389456 (CVE-2025-38556)

Summary:	CVE-2025-38556 kernel: HID: core: Harden s32ton() against conversion to 0 bits
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	Keywords:	Security
Target Milestone:	---
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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 18:01:36 UTC

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

HID: core: Harden s32ton() against conversion to 0 bits

Testing by the syzbot fuzzer showed that the HID core gets a
shift-out-of-bounds exception when it tries to convert a 32-bit
quantity to a 0-bit quantity.  Ideally this should never occur, but
there are buggy devices and some might have a report field with size
set to zero; we shouldn't reject the report or the device just because
of that.

Instead, harden the s32ton() routine so that it returns a reasonable
result instead of crashing when it is called with the number of bits
set to 0 -- the same as what snto32() does.

Comment 1 Alexander B 2025-08-20 10:11:35 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081905-CVE-2025-38556-521e@gregkh/T

Comment 3 errata-xmlrpc 2025-09-22 14:09:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:16372 https://access.redhat.com/errata/RHSA-2025:16372

Comment 4 errata-xmlrpc 2025-10-13 04:01:35 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:17760 https://access.redhat.com/errata/RHSA-2025:17760

Comment 5 errata-xmlrpc 2025-10-13 08:59:10 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:17776 https://access.redhat.com/errata/RHSA-2025:17776

Comment 12 errata-xmlrpc 2025-10-22 00:23:13 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2025:18932 https://access.redhat.com/errata/RHSA-2025:18932

Comment 13 errata-xmlrpc 2025-10-27 16:19:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:19104 https://access.redhat.com/errata/RHSA-2025:19104

Comment 14 errata-xmlrpc 2025-10-29 00:15:55 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2025:19223 https://access.redhat.com/errata/RHSA-2025:19223

Comment 15 errata-xmlrpc 2025-10-29 00:35:45 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2025:19224 https://access.redhat.com/errata/RHSA-2025:19224

Comment 16 errata-xmlrpc 2025-10-29 00:36:13 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.6 Telecommunications Update Service

Via RHSA-2025:19222 https://access.redhat.com/errata/RHSA-2025:19222

Comment 17 errata-xmlrpc 2025-10-29 15:11:45 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:19268 https://access.redhat.com/errata/RHSA-2025:19268

Comment 18 errata-xmlrpc 2025-11-03 15:53:35 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2025:19492 https://access.redhat.com/errata/RHSA-2025:19492

Comment 19 errata-xmlrpc 2025-11-12 02:37:52 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2025:21063 https://access.redhat.com/errata/RHSA-2025:21063

Comment 20 errata-xmlrpc 2025-11-12 04:25:18 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2025:21082 https://access.redhat.com/errata/RHSA-2025:21082

Comment 21 errata-xmlrpc 2025-11-18 09:00:44 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support

Via RHSA-2025:21667 https://access.redhat.com/errata/RHSA-2025:21667