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CVE-2026-43334— Bluetooth: SMP: force responder MITM requirements before building the pairing response

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于蓝牙SMP协议中smp_cmd_pairing_req函数在强制本地BT_SECURITY_HIGH要求前构建配对响应，若发起方省略SMP_AUTH_MITM，响应可能也省略该标志，导致方法选择与配对策略不一致。

CVSS 8.8 · High EPSS 0.25% · P15

Possible ATT&CK Techniques 1 AI

T1042

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 2b64d153a0cc9d2b60e47be013cde8490f16e0a5< 425a22c5373d4e1b46492ab869074ebeeade61f3 affected
2b64d153a0cc9d2b60e47be013cde8490f16e0a5< 7ab69426e7ecbd18a222ee2ec87ca612d30197d7 affected
2b64d153a0cc9d2b60e47be013cde8490f16e0a5< 01bb4045d2306c266178f49ce0c3576d237a3040 affected
2b64d153a0cc9d2b60e47be013cde8490f16e0a5< 91649c02c1baaa18cedf7fb425fa1f0f852c8183 affected
2b64d153a0cc9d2b60e47be013cde8490f16e0a5< c8ff0ca6508535bccabd81c5c9dcc63de8a3d4fb affected
2b64d153a0cc9d2b60e47be013cde8490f16e0a5< fa14e0e19820b1bbdb42185c9c4efa950bcffef9 affected
2b64d153a0cc9d2b60e47be013cde8490f16e0a5< ec17efb1ef91506cfd17a77692eaf4bbacb520ea affected
2b64d153a0cc9d2b60e47be013cde8490f16e0a5< d05111bfe37bfd8bd4d2dfe6675d6bdeef43f7c7 affected
… +10 more rows
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I. Basic Information for CVE-2026-43334

Vulnerability Information
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Vulnerability Title
Bluetooth: SMP: force responder MITM requirements before building the pairing response
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于蓝牙SMP协议中smp_cmd_pairing_req函数在强制本地BT_SECURITY_HIGH要求前构建配对响应，若发起方省略SMP_AUTH_MITM，响应可能也省略该标志，导致方法选择与配对策略不一致。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2b64d153a0cc9d2b60e47be013cde8490f16e0a5 ~ 425a22c5373d4e1b46492ab869074ebeeade61f3 -
Linux Linux 3.3 -

II. Public POCs for CVE-2026-43334

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III. Intelligence Information for CVE-2026-43334

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Patches & Fixes for CVE-2026-43334 (8)

Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total

CVE-2026-43341 9.8 CRITICAL net/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-43414 9.8 CRITICAL scsi: qla2xxx: Completely fix fcport double free
CVE-2026-43402 9.8 CRITICAL kthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-43304 9.8 CRITICAL libceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-43384 9.8 CRITICAL net/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-43379 9.8 CRITICAL ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-43376 9.8 CRITICAL ksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-43378 9.8 CRITICAL smb: server: fix use-after-free in smb2_open()
CVE-2026-43465 9.8 CRITICAL net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-43383 9.4 CRITICAL net/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-43406 9.1 CRITICAL libceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-43407 9.1 CRITICAL libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-43284 8.8 HIGH xfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-43322 8.8 HIGH Bluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-43391 8.8 HIGH nsfs: tighten permission checks for handle opening
CVE-2026-43403 8.8 HIGH nsfs: tighten permission checks for ns iteration ioctls
CVE-2026-43291 8.3 HIGH net: nfc: nci: Fix parameter validation for packet data
CVE-2026-43466 8.2 HIGH net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery
CVE-2026-43365 8.2 HIGH xfs: fix undersized l_iclog_roundoff values
CVE-2026-43452 8.2 HIGH netfilter: x_tables: guard option walkers against 1-byte tail reads

Showing top 20 of 197 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43334

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