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CVE-2026-43134— Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ

CVSS 8.1 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1AI

T1510

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d< 335071c0c3637064ec250481f589075db44fe4e6affected
27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d< fa6ad76fa8623c0a50d529cd5726fa5d819a3be4affected
27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d< 9118601ff90b79e8df3c0c98f48ae00c1b02ecefaffected
27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d< 481ea39b342c347b6ac029f3d418486280be4e45affected
27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d< ec91078e132179b04e0c3906b599816c056ceaadaffected
27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d< 96581749c7c14fbec32c35728520867929600041affected
27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d< 8dd43f9a9323f9c01bc8246da8d81a4c783c9e97affected
27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d< 138d7eca445ef37a0333425d269ee59900ca1104affected
… +10 more rows
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I. Basic Information for CVE-2026-43134

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ This adds a check for encryption key size upon receiving L2CAP_LE_CONN_REQ which is required by L2CAP/LE/CFC/BV-15-C which expects L2CAP_CR_LE_BAD_KEY_SIZE.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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Bluetooth L2CAP中缺少加密密钥大小检查，可能导致不符合预期行为。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d ~ 335071c0c3637064ec250481f589075db44fe4e6 -
LinuxLinux 3.14 -

II. Public POCs for CVE-2026-43134

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III. Intelligence Information for CVE-2026-43134

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Patches & Fixes for CVE-2026-43134 (8)

Same Patch Batch · Linux · 2026-05-06 · 224 CVEs total

CVE-2026-431859.8 CRITICALksmbd: fix signededness bug in smb_direct_prepare_negotiation()
CVE-2026-431869.8 CRITICALipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()
CVE-2026-432089.8 CRITICALnet: do not pass flow_id to set_rps_cpu()
CVE-2026-431989.8 CRITICALtcp: fix potential race in tcp_v6_syn_recv_sock()
CVE-2026-431259.8 CRITICALdlm: validate length in dlm_search_rsb_tree
CVE-2026-431149.4 CRITICALnetfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
CVE-2026-430839.1 CRITICALnet: ioam6: fix OOB and missing lock
CVE-2026-431179.1 CRITICALbtrfs: tracepoints: get correct superblock from dentry in event btrfs_sync_file()
CVE-2026-431979.1 CRITICALnetconsole: avoid OOB reads, msg is not nul-terminated
CVE-2026-432328.8 HIGHnet: wan: farsync: Fix use-after-free bugs caused by unfinished tasklets
CVE-2026-431128.8 HIGHfs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
CVE-2026-431138.8 HIGHwifi: wl1251: validate packet IDs before indexing tx_frames
CVE-2026-431108.8 HIGHwifi: brcmfmac: validate bsscfg indices in IF events
CVE-2026-431878.8 HIGHxfs: delete attr leaf freemap entries when empty
CVE-2026-432158.8 HIGHcifs: Fix locking usage for tcon fields
CVE-2026-431768.8 HIGHwifi: rtw89: pci: validate release report content before using for RTL8922DE
CVE-2026-432838.8 HIGHnet: ethernet: ec_bhf: Fix dma_free_coherent() dma handle
CVE-2026-432498.8 HIGH9p/xen: protect xen_9pfs_front_free against concurrent calls
CVE-2026-431588.8 HIGHxfs: fix freemap adjustments when adding xattrs to leaf blocks
CVE-2026-431728.8 HIGHwifi: iwlwifi: fix 22000 series SMEM parsing

Showing top 20 of 224 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43134

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