CVE-2026-43020 Details
Description
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.
A vulnerability in the Linux kernel's Bluetooth management layer has been addressed. This issue arises from the handling of Long Term Keys (LTKs), where the user-defined encryption size can exceed the buffer limit, leading to a stack buffer overflow. The vulnerability is present in the management of LTK records, specifically when responding to Low Energy LTK requests. Oversized encryption sizes were not properly validated, allowing invalid keys to disrupt the key management state. The flaw has been corrected by implementing checks to reject excessive encryption sizes before they can cause harm.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789d | kernel.org | Patch |
| https://git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64 | kernel.org | Patch |
| https://git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009 | kernel.org | Patch |
| https://git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257 | kernel.org | Patch |
| https://git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15 | kernel.org | Patch |
| https://git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564ce | kernel.org | Patch |
| https://git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52c | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 3.4, < 5.10.253 >= 5.11, < 5.15.203 >= 5.16, < 6.1.168 >= 6.2, < 6.6.134 >= 6.7, < 6.12.81 >= 6.13, < 6.18.22 >= 6.19, < 6.19.12 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 8, 2026 | Initial Analysis | [email protected] |
| May 1, 2026 | New CVE Received | kernel.org |