Bluetooth: MGMT: validate LTK enc_size on load

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Summary

CVECVE-2026-43020
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:46 UTC
Updated2026-05-08 14:41:09 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-787

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 346af67b8d116f01ef696fd47959a55deb2db8b6 0f37d1e65c6d71ad94ccfb5c602163c525db789d git Not specified
CNA Linux Linux affected 346af67b8d116f01ef696fd47959a55deb2db8b6 257cdb960d8ff6d60bb6461b03c814b6cf0c9e64 git Not specified
CNA Linux Linux affected 346af67b8d116f01ef696fd47959a55deb2db8b6 c34577f517b556fb6ca173d45bf7e766ae2564ce git Not specified
CNA Linux Linux affected 346af67b8d116f01ef696fd47959a55deb2db8b6 f71695e81f4cb428f3c7e2138eae88199005b52c git Not specified
CNA Linux Linux affected 346af67b8d116f01ef696fd47959a55deb2db8b6 82f342b3b006ca1d65f4890c05f2ec32fcb808b6 git Not specified
CNA Linux Linux affected 346af67b8d116f01ef696fd47959a55deb2db8b6 50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257 git Not specified
CNA Linux Linux affected 346af67b8d116f01ef696fd47959a55deb2db8b6 40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009 git Not specified
CNA Linux Linux affected 346af67b8d116f01ef696fd47959a55deb2db8b6 b8dbe9648d69059cfe3a28917bfbf7e61efd7f15 git Not specified
CNA Linux Linux affected 3.4 Not specified
CNA Linux Linux unaffected 3.4 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/40ba329e8b4cd2fb11b0caf5e6a543ceaebb6009 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/82f342b3b006ca1d65f4890c05f2ec32fcb808b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c34577f517b556fb6ca173d45bf7e766ae2564ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/0f37d1e65c6d71ad94ccfb5c602163c525db789d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b8dbe9648d69059cfe3a28917bfbf7e61efd7f15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/257cdb960d8ff6d60bb6461b03c814b6cf0c9e64 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f71695e81f4cb428f3c7e2138eae88199005b52c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/50fb64defa72a3fecd0af1ca7c6b47b5c5c2b257 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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