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CVE-2026-43020 is a stack-based buffer overflow vulnerability in the Linux kernel Bluetooth management (MGMT) subsystem, in the code path that loads Long Term Keys (LTKs) and later replies to LE LTK requests. The flaw arises because a user-provided LTK encryption size value, enc_size, is stored without sufficient validation and is subsequently used to size fixed-size stack operations. If enc_size exceeds the 16-byte key buffer size, the reply path can write past the bounds of a fixed-size stack buffer. The issue affects the Bluetooth MGMT implementation in the kernel, including code in net/bluetooth/mgmt.c, and was addressed by rejecting oversized enc_size values during management LTK record validation so invalid key material never reaches stored key state.
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13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel Bluetooth MGMT vulnerability in Long Term Key handling where an oversized user-provided enc_size can cause a fixed-size stack buffer overflow during LE LTK request replies.
A Linux kernel Bluetooth MGMT vulnerability involving validation of LTK enc_size on load.
A Linux kernel Bluetooth management vulnerability involving insufficient validation of LTK enc_size during load.
Linux kernel Bluetooth MGMT vulnerability involving insufficient validation of LTK enc_size on load.
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.