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CVE-2026-64408— Bluetooth: bnep: pin L2CAP connection during netdev registration

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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于bnep_add_connection()函数在读取L2CAP连接时未持有通道锁，控制器拆除过程可能并发清除和释放该连接，导致网络设备注册路径解引用已释放的父设备。

CVSS 8.8 · High EPSS 0.26% · P17

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 65f53e9802dbfae0e5758a91793c3f5f8bece49b< 390b5db3ff8745187f094c4e915663b7b1f98944 affected
65f53e9802dbfae0e5758a91793c3f5f8bece49b< 46a88784c4c9b96954dd86f747ce93f65efa1302 affected
65f53e9802dbfae0e5758a91793c3f5f8bece49b< 551ae773ec64045b4e72099132654887e0270bcc affected
65f53e9802dbfae0e5758a91793c3f5f8bece49b< ae215c5b6422d8eda443b861b124bd1be6969c31 affected
65f53e9802dbfae0e5758a91793c3f5f8bece49b< df22adc7eafc22e651561813c11dc51a796b12ee affected
65f53e9802dbfae0e5758a91793c3f5f8bece49b< a6b22dbd80926556290ad2243be25218d6956a19 affected
65f53e9802dbfae0e5758a91793c3f5f8bece49b< 563a8573047182f550b1e1e030615755cd8c41da affected
65f53e9802dbfae0e5758a91793c3f5f8bece49b< bb067a99a0356196c0b89a95721985485ebce5a5 affected
… +10 more rows
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I. Basic Information for CVE-2026-64408

Vulnerability Information
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Vulnerability Title
Bluetooth: bnep: pin L2CAP connection during netdev registration
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bnep: pin L2CAP connection during netdev registration bnep_add_connection() reads the L2CAP connection without holding the channel lock, then passes its HCI device to register_netdev(). Controller teardown can clear and release that connection concurrently, leaving the network device registration path to dereference a freed parent device. Take a reference to the L2CAP connection while holding the channel lock. Retain it until register_netdev() has taken the parent device reference.
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基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于bnep_add_connection()函数在读取L2CAP连接时未持有通道锁，控制器拆除过程可能并发清除和释放该连接，导致网络设备注册路径解引用已释放的父设备。
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 65f53e9802dbfae0e5758a91793c3f5f8bece49b ~ 390b5db3ff8745187f094c4e915663b7b1f98944 -
Linux Linux 3.13 -

II. Public POCs for CVE-2026-64408

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III. Intelligence Information for CVE-2026-64408

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Patches & Fixes for CVE-2026-64408 (6)

Other References for CVE-2026-64408 (1)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64320 9.1 CRITICAL nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64408

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