CVE-2026-43020
HIGH severity · CVSS 7.8 · Out-of-bounds write
7.8CVSS HIGH
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.
Impact & exploitability
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789d ↗
Additional information
- NVD record
- https://git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789dPatch
- https://git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64Patch
- https://git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009Patch
- https://git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257Patch
- https://git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6Patch
- https://git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15Patch
- https://git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564cePatch
- https://git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52cPatch