HOMEVULNERABILITIESCVE-2026-43020
HIGH

CVE-2026-43020

Published: May 1, 2026· Updated: May 8, 2026

7.8
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:6.8th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-43020 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Linux1 product
linux kernel
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (8)

→
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

Quick Facts

CVE IDCVE-2026-43020
CVSS Score7.8 / 10
SeverityHIGH
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMay 1, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-43020 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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