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CVE-2026-43020 is a stack buffer overflow in the Linux kernel Bluetooth management (MGMT) subsystem. The Load Long Term Keys operation stores a user-provided enc_size without adequately validating its upper bound. When responding to subsequent Bluetooth Low Energy LTK requests, the kernel uses that stored value to size operations on a fixed-size stack buffer. An enc_size exceeding the 16-byte key buffer can overflow the reply buffer, potentially causing denial of service. The flaw was introduced in Linux 3.4 and is corrected by rejecting oversized encryption sizes during management LTK record validation.
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No public exploit code observed for this vulnerability.
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18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A validation vulnerability in Linux kernel Bluetooth management involving the LTK enc_size value during loading. The update adds validation; the advisory does not specify exploitability or resulting impact.
A Linux kernel Bluetooth management vulnerability involving validation of the long-term key encryption-size value when loading keys. Security updates are available for affected Rocky Linux 10.2 kernel packages.
A vulnerability addressed by the referenced CentOS Linux 8 TuxCare update; no technical details are provided.
A locally exploitable vulnerability requiring low privileges, with high confidentiality, integrity, and availability impact according to the supplied CVSS v3 vector. It is addressed by the referenced CentOS 7/TuxCare advisory.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.