Bug 2439947 (CVE-2026-23191) - CVE-2026-23191 kernel: ALSA: aloop: Fix racy access at PCM trigger
Summary: CVE-2026-23191 kernel: ALSA: aloop: Fix racy access at PCM trigger
Keywords:
Status: NEW
Alias: CVE-2026-23191
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-14 17:04 UTC by OSIDB Bzimport
Modified: 2026-05-20 04:05 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:13734 0 None None None 2026-05-05 13:05:47 UTC
Red Hat Product Errata RHSA-2026:13932 0 None None None 2026-05-06 08:16:11 UTC
Red Hat Product Errata RHSA-2026:13936 0 None None None 2026-05-06 08:15:38 UTC
Red Hat Product Errata RHSA-2026:14137 0 None None None 2026-05-06 13:38:10 UTC
Red Hat Product Errata RHSA-2026:14230 0 None None None 2026-05-06 17:25:00 UTC
Red Hat Product Errata RHSA-2026:14301 0 None None None 2026-05-06 18:45:46 UTC
Red Hat Product Errata RHSA-2026:14869 0 None None None 2026-05-07 17:24:23 UTC
Red Hat Product Errata RHSA-2026:14925 0 None None None 2026-05-07 19:34:53 UTC
Red Hat Product Errata RHSA-2026:19521 0 None None None 2026-05-20 04:05:12 UTC
Red Hat Product Errata RHSA-2026:6153 0 None None None 2026-03-30 11:06:31 UTC
Red Hat Product Errata RHSA-2026:6632 0 None None None 2026-04-06 07:50:04 UTC
Red Hat Product Errata RHSA-2026:9131 0 None None None 2026-04-20 21:01:41 UTC
Red Hat Product Errata RHSA-2026:9135 0 None None None 2026-04-20 20:55:46 UTC

Description OSIDB Bzimport 2026-02-14 17:04:26 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ALSA: aloop: Fix racy access at PCM trigger

The PCM trigger callback of aloop driver tries to check the PCM state
and stop the stream of the tied substream in the corresponding cable.
Since both check and stop operations are performed outside the cable
lock, this may result in UAF when a program attempts to trigger
frequently while opening/closing the tied stream, as spotted by
fuzzers.

For addressing the UAF, this patch changes two things:
- It covers the most of code in loopback_check_format() with
  cable->lock spinlock, and add the proper NULL checks.  This avoids
  already some racy accesses.
- In addition, now we try to check the state of the capture PCM stream
  that may be stopped in this function, which was the major pain point
  leading to UAF.
Comment 1 TEJ RATHI 2026-02-16 06:30:51 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021433-CVE-2026-23191-f990@gregkh/T
Comment 3 errata-xmlrpc 2026-03-30 11:06:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:6153 https://access.redhat.com/errata/RHSA-2026:6153
Comment 4 errata-xmlrpc 2026-04-06 07:50:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:6632 https://access.redhat.com/errata/RHSA-2026:6632
Comment 5 errata-xmlrpc 2026-04-20 20:55:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:9135 https://access.redhat.com/errata/RHSA-2026:9135
Comment 6 errata-xmlrpc 2026-04-20 21:01:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:9131 https://access.redhat.com/errata/RHSA-2026:9131
Comment 9 errata-xmlrpc 2026-05-05 13:05:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:13734 https://access.redhat.com/errata/RHSA-2026:13734
Comment 10 errata-xmlrpc 2026-05-06 08:15:37 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:13936 https://access.redhat.com/errata/RHSA-2026:13936
Comment 11 errata-xmlrpc 2026-05-06 08:16:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2026:13932 https://access.redhat.com/errata/RHSA-2026:13932
Comment 12 errata-xmlrpc 2026-05-06 13:38:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

Via RHSA-2026:14137 https://access.redhat.com/errata/RHSA-2026:14137
Comment 13 errata-xmlrpc 2026-05-06 17:24:59 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-2026:14230 https://access.redhat.com/errata/RHSA-2026:14230
Comment 14 errata-xmlrpc 2026-05-06 18:45:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:14301 https://access.redhat.com/errata/RHSA-2026:14301
Comment 15 errata-xmlrpc 2026-05-07 17:24:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:14869 https://access.redhat.com/errata/RHSA-2026:14869
Comment 16 errata-xmlrpc 2026-05-07 19:34:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:14925 https://access.redhat.com/errata/RHSA-2026:14925
Comment 17 errata-xmlrpc 2026-05-20 04:05:11 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-2026:19521 https://access.redhat.com/errata/RHSA-2026:19521
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