CVE-2026-43334Bluetooth: SMP: force responder MITM requirements before building the pairing response
- 8.8HighCVSS base score
- 0.28%Exploitation in 30 daysEPSS · top 80% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SMP: force responder MITM requirements before building the pairing response smp_cmd_pairing_req() currently builds the pairing response from the initiator auth_req before enforcing the local BT_SECURITY_HIGH requirement. If the initiator omits SMP_AUTH_MITM, the response can also omit it even though the local side still requires MITM. tk_request() then sees an auth value without SMP_AUTH_MITM and may select JUST_CFM, making method selection inconsistent with the pairing policy the responder already enforces. When the local side requires HIGH security, first verify that MITM can be achieved from the IO capabilities and then force SMP_AUTH_MITM in the response in both rsp.auth_req and auth. This keeps the responder auth bits and later method selection aligned.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 5 months later
· 5 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.28% · top 80% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
- affected 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 – < 425a22c5373d4e1b46492ab869074ebeeade61f3
- affected 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 – < 7ab69426e7ecbd18a222ee2ec87ca612d30197d7
- affected 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 – < 01bb4045d2306c266178f49ce0c3576d237a3040
- affected 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 – < 91649c02c1baaa18cedf7fb425fa1f0f852c8183
- affected 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 – < c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fb
- affected 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 – < fa14e0e19820b1bbdb42185c9c4efa950bcffef9
- affected 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 – < ec17efb1ef91506cfd17a77692eaf4bbacb520ea
- affected 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 – < d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7
- affected 3.3
- unaffected < 3.3
- unaffected 5.10.253 – ≤ 5.10.*
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.168 – ≤ 6.1.*
- unaffected 6.6.134 – ≤ 6.6.*
- unaffected 6.12.81 – ≤ 6.12.*
- unaffected 6.18.22 – ≤ 6.18.*
- unaffected 6.19.12 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/425a22c5373d4e1b46492ab869074ebeeade61f3 (opens in a new tab)
- https://git.kernel.org/stable/c/7ab69426e7ecbd18a222ee2ec87ca612d30197d7 (opens in a new tab)
- https://git.kernel.org/stable/c/01bb4045d2306c266178f49ce0c3576d237a3040 (opens in a new tab)
- https://git.kernel.org/stable/c/91649c02c1baaa18cedf7fb425fa1f0f852c8183 (opens in a new tab)
- https://git.kernel.org/stable/c/c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fb (opens in a new tab)
- https://git.kernel.org/stable/c/fa14e0e19820b1bbdb42185c9c4efa950bcffef9 (opens in a new tab)
- https://git.kernel.org/stable/c/ec17efb1ef91506cfd17a77692eaf4bbacb520ea (opens in a new tab)
- https://git.kernel.org/stable/c/d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-28618 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-43334)Record last updated .