CVE-2026-43020

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux346af67b8d116f01ef696fd47959a55deb2db8b6 < 0f37d1e65c6d71ad94ccfb5c602163c525db789daffected
LinuxLinux346af67b8d116f01ef696fd47959a55deb2db8b6 < 257cdb960d8ff6d60bb6461b03c814b6cf0c9e64affected
LinuxLinux346af67b8d116f01ef696fd47959a55deb2db8b6 < c34577f517b556fb6ca173d45bf7e766ae2564ceaffected
LinuxLinux346af67b8d116f01ef696fd47959a55deb2db8b6 < f71695e81f4cb428f3c7e2138eae88199005b52caffected
LinuxLinux346af67b8d116f01ef696fd47959a55deb2db8b6 < 82f342b3b006ca1d65f4890c05f2ec32fcb808b6affected
LinuxLinux346af67b8d116f01ef696fd47959a55deb2db8b6 < 50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257affected
LinuxLinux346af67b8d116f01ef696fd47959a55deb2db8b6 < 40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009affected
LinuxLinux346af67b8d116f01ef696fd47959a55deb2db8b6 < b8dbe9648d69059cfe3a28917bfbf7e61efd7f15affected
LinuxLinux3.4affected
LinuxLinux0 < 3.4unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.134 <= 6.6.*unaffected
LinuxLinux6.12.81 <= 6.12.*unaffected
LinuxLinux6.18.22 <= 6.18.*unaffected
LinuxLinux6.19.12 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References