Bug 2467215 (CVE-2026-43279)

Summary:	CVE-2026-43279 kernel: ALSA: usb-audio: Add sanity check for OOB writes at silencing
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 ALSA (Advanced Linux Sound Architecture) USB audio subsystem. An inconsistency in how USB audio playback and capture streams are handled can lead to an out-of-bounds write to a memory buffer. This can result in a system crash, causing a denial of service for a local user.	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 13:11:20 UTC

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

ALSA: usb-audio: Add sanity check for OOB writes at silencing

At silencing the playback URB packets in the implicit fb mode before
the actual playback, we blindly assume that the received packets fit
with the buffer size.  But when the setup in the capture stream
differs from the playback stream (e.g. due to the USB core limitation
of max packet size), such an inconsistency may lead to OOB writes to
the buffer, resulting in a crash.

For addressing it, add a sanity check of the transfer buffer size at
prepare_silent_urb(), and stop the data copy if the received data
overflows.  Also, report back the transfer error properly from there,
too.

Note that this doesn't fix the root cause of the playback error
itself, but this merely covers the kernel Oops.

Comment 1 Vipul Nair 2026-05-06 14:39:33 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050613-CVE-2026-43279-4530@gregkh/T

Comment 5 errata-xmlrpc 2026-06-19 16:29:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:27354 https://access.redhat.com/errata/RHSA-2026:27354

Comment 6 errata-xmlrpc 2026-06-19 16:51:14 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:27353 https://access.redhat.com/errata/RHSA-2026:27353

Comment 7 errata-xmlrpc 2026-06-22 08:29:14 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:27789 https://access.redhat.com/errata/RHSA-2026:27789

Comment 8 errata-xmlrpc 2026-06-30 19:04:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:33685 https://access.redhat.com/errata/RHSA-2026:33685

Comment 9 errata-xmlrpc 2026-07-01 00:13:35 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:33900 https://access.redhat.com/errata/RHSA-2026:33900

Comment 10 errata-xmlrpc 2026-07-01 08:40:56 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:34095 https://access.redhat.com/errata/RHSA-2026:34095

Comment 11 errata-xmlrpc 2026-07-06 04:51:28 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-2026:35863 https://access.redhat.com/errata/RHSA-2026:35863

Comment 12 errata-xmlrpc 2026-07-06 13:42:06 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 Extended Update Support Long-Life Add-On

Via RHSA-2026:35894 https://access.redhat.com/errata/RHSA-2026:35894

Comment 13 errata-xmlrpc 2026-07-08 14:51:30 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:36767 https://access.redhat.com/errata/RHSA-2026:36767

Comment 14 errata-xmlrpc 2026-07-13 12:50:40 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

Comment 15 errata-xmlrpc 2026-07-23 16:00:09 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:44522 https://access.redhat.com/errata/RHSA-2026:44522

Comment 16 errata-xmlrpc 2026-07-27 06:53:07 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:46461 https://access.redhat.com/errata/RHSA-2026:46461

Comment 17 errata-xmlrpc 2026-07-29 01:06:31 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:47633 https://access.redhat.com/errata/RHSA-2026:47633

Comment 18 errata-xmlrpc 2026-08-17 04:36:59 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:55445 https://access.redhat.com/errata/RHSA-2026:55445