Bug 2403545 (CVE-2025-39964) - CVE-2025-39964 kernel: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg
Summary: CVE-2025-39964 kernel: crypto: af_alg - Disallow concurrent writes in af_alg_...
Keywords:
Status: NEW
Alias: CVE-2025-39964
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: 2025-10-13 14:01 UTC by OSIDB Bzimport
Modified: 2026-09-30 07:46 UTC (History)
3 users (show)

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-2026:70402 0 None None None 2026-09-22 20:20:59 UTC
Red Hat Product Errata RHSA-2026:70403 0 None None None 2026-09-22 19:30:08 UTC
Red Hat Product Errata RHSA-2026:70459 0 None None None 2026-09-23 20:29:19 UTC
Red Hat Product Errata RHSA-2026:70498 0 None None None 2026-09-23 03:56:08 UTC
Red Hat Product Errata RHSA-2026:71326 0 None None None 2026-09-24 05:40:33 UTC
Red Hat Product Errata RHSA-2026:71327 0 None None None 2026-09-24 05:58:36 UTC
Red Hat Product Errata RHSA-2026:71565 0 None None None 2026-09-24 10:34:25 UTC
Red Hat Product Errata RHSA-2026:71569 0 None None None 2026-09-24 13:43:21 UTC
Red Hat Product Errata RHSA-2026:71592 0 None None None 2026-09-24 11:51:05 UTC
Red Hat Product Errata RHSA-2026:71594 0 None None None 2026-09-24 12:42:14 UTC
Red Hat Product Errata RHSA-2026:71601 0 None None None 2026-09-24 13:46:36 UTC
Red Hat Product Errata RHSA-2026:71606 0 None None None 2026-09-24 12:54:41 UTC
Red Hat Product Errata RHSA-2026:71657 0 None None None 2026-09-24 16:16:48 UTC
Red Hat Product Errata RHSA-2026:71687 0 None None None 2026-09-24 22:30:35 UTC
Red Hat Product Errata RHSA-2026:72059 0 None None None 2026-09-25 18:00:45 UTC
Red Hat Product Errata RHSA-2026:73788 0 None None None 2026-09-30 07:46:25 UTC

Description OSIDB Bzimport 2025-10-13 14:01:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

Issuing two writes to the same af_alg socket is bogus as the
data will be interleaved in an unpredictable fashion.  Furthermore,
concurrent writes may create inconsistencies in the internal
socket state.

Disallow this by adding a new ctx->write field that indiciates
exclusive ownership for writing.
Comment 1 Jon Moroney 2025-10-13 16:01:31 UTC Comment hidden (spam)
Comment 5 Jon Orris 2026-09-22 19:30:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:70403 https://access.redhat.com/errata/RHSA-2026:70403
Comment 6 Jon Orris 2026-09-22 20:20:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:70402 https://access.redhat.com/errata/RHSA-2026:70402
Comment 7 Jon Orris 2026-09-23 03:56:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:70498 https://access.redhat.com/errata/RHSA-2026:70498
Comment 8 Jon Orris 2026-09-23 20:29:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:70459 https://access.redhat.com/errata/RHSA-2026:70459
Comment 9 Jon Orris 2026-09-24 05:40:32 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:71326 https://access.redhat.com/errata/RHSA-2026:71326
Comment 10 Jon Orris 2026-09-24 05:58:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:71327 https://access.redhat.com/errata/RHSA-2026:71327
Comment 11 Jon Orris 2026-09-24 10:34:24 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-2026:71565 https://access.redhat.com/errata/RHSA-2026:71565
Comment 12 Jon Orris 2026-09-24 11:51:04 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-2026:71592 https://access.redhat.com/errata/RHSA-2026:71592
Comment 13 Jon Orris 2026-09-24 12:42:13 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-2026:71594 https://access.redhat.com/errata/RHSA-2026:71594
Comment 14 Jon Orris 2026-09-24 12:54:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:71606 https://access.redhat.com/errata/RHSA-2026:71606
Comment 15 Jon Orris 2026-09-24 13:43:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:71569 https://access.redhat.com/errata/RHSA-2026:71569
Comment 16 Jon Orris 2026-09-24 13:46:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:71601 https://access.redhat.com/errata/RHSA-2026:71601
Comment 17 Jon Orris 2026-09-24 16:16:48 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:71657 https://access.redhat.com/errata/RHSA-2026:71657
Comment 18 Jon Orris 2026-09-24 22:30:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:71687 https://access.redhat.com/errata/RHSA-2026:71687
Comment 19 Jon Orris 2026-09-25 18:00:43 UTC 
This issue has been addressed in the following products:

  NVIDIA for RHEL 10

Via RHSA-2026:72059 https://access.redhat.com/errata/RHSA-2026:72059
Comment 20 Jon Orris 2026-09-30 07:46:24 UTC 
This issue has been addressed in the following products:

  NVIDIA for RHEL 10

Via RHSA-2026:73788 https://access.redhat.com/errata/RHSA-2026:73788
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