Bug 2464455 (CVE-2026-43020) - CVE-2026-43020 kernel: Bluetooth: MGMT: validate LTK enc_size on load
Summary: CVE-2026-43020 kernel: Bluetooth: MGMT: validate LTK enc_size on load
Keywords:
Status: NEW
Alias: CVE-2026-43020
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-01 15:07 UTC by OSIDB Bzimport
Modified: 2026-05-28 13:26 UTC (History)
2 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-2026:21556 0 None None None 2026-05-28 01:24:05 UTC
Red Hat Product Errata RHSA-2026:21557 0 None None None 2026-05-28 01:20:00 UTC
Red Hat Product Errata RHSA-2026:21706 0 None None None 2026-05-28 08:26:03 UTC
Red Hat Product Errata RHSA-2026:21745 0 None None None 2026-05-28 13:26:30 UTC

Description OSIDB Bzimport 2026-05-01 15:07:45 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: MGMT: validate LTK enc_size on load

Load Long Term Keys stores the user-provided enc_size and later uses
it to size fixed-size stack operations when replying to LE LTK
requests. An enc_size larger than the 16-byte key buffer can therefore
overflow the reply stack buffer.

Reject oversized enc_size values while validating the management LTK
record so invalid keys never reach the stored key state.
Comment 1 Keith Grant 2026-05-01 16:49:05 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050157-CVE-2026-43020-3561@gregkh/T
Comment 3 errata-xmlrpc 2026-05-28 01:19:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:21557 https://access.redhat.com/errata/RHSA-2026:21557
Comment 4 errata-xmlrpc 2026-05-28 01:24:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:21556 https://access.redhat.com/errata/RHSA-2026:21556
Comment 5 errata-xmlrpc 2026-05-28 08:26:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:21706 https://access.redhat.com/errata/RHSA-2026:21706
Comment 6 errata-xmlrpc 2026-05-28 13:26:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:21745 https://access.redhat.com/errata/RHSA-2026:21745
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