High 7.8Published May 1, 2026

CVE-2026-43020Bluetooth: MGMT: validate LTK enc_size on load

Updated under an hour ago (Oct 27, 2026, 2:00 PM ET)

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	346af67b8d116f01ef696fd47959a55deb2db8b6 builds before 0f37d1e65c6d71ad94ccfb5c602163c525db789d; 346af67b8d116f01ef696fd47959a55deb2db8b6 builds before 257cdb960d8ff6d60bb6461b03c814b6cf0c9e64; from 346af67b8d116f01ef696fd47959a55deb2db8b6 before c34577f517b556fb6ca173d45bf7e766ae2564ce; from 346af67b8d116f01ef696fd47959a55deb2db8b6 before f71695e81f4cb428f3c7e2138eae88199005b52c; 346af67b8d116f01ef696fd47959a55deb2db8b6 builds before 82f342b3b006ca1d65f4890c05f2ec32fcb808b6; 346af67b8d116f01ef696fd47959a55deb2db8b6 builds before 50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257; 346af67b8d116f01ef696fd47959a55deb2db8b6 builds before 40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009; from 346af67b8d116f01ef696fd47959a55deb2db8b6 before b8dbe9648d69059cfe3a28917bfbf7e61efd7f15	CNA record
linux linux_kernel linux:linux_kernel	from 3.4 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22; from 6.19 before 6.19.12; 7.0; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789d	patch
https://git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64	patch
https://git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564ce	patch
https://git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52c	patch
https://git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6	patch
https://git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257	patch
https://git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009	patch
https://git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.