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CVE-2026-64206— Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock

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 3.16版本存在安全漏洞，该漏洞源于Bluetooth L2CAP在释放连接时正确加锁，可能导致死锁。

CVSS 8.8 · High EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 7ab56c3a6eccb215034b0cb096e0313441cbf2a4< fc0c3b9cf27cfa2a06f66dae1d08c668fe0a2faa affected
7ab56c3a6eccb215034b0cb096e0313441cbf2a4< 9901f847a762a5d953871dd95767ce2aed3d684d affected
7ab56c3a6eccb215034b0cb096e0313441cbf2a4< 4a0bb0fd63fe2b0c62e1072cd1811d6f61e0081c affected
7ab56c3a6eccb215034b0cb096e0313441cbf2a4< 8daaf7f73fe998631a160d1a5a7e1b0b0480eef8 affected
7ab56c3a6eccb215034b0cb096e0313441cbf2a4< 8de7b386ffad480ca59222b688c94a2da8f0d805 affected
7ab56c3a6eccb215034b0cb096e0313441cbf2a4< d5616beb3355b5fca2280d796c1cf7ada4ee6551 affected
7ab56c3a6eccb215034b0cb096e0313441cbf2a4< e96fbac8d3a73b0bc165383c092a30628561d320 affected
7ab56c3a6eccb215034b0cb096e0313441cbf2a4< 2641a9e0a1dd4af2e21995470a21d55dd35e5203 affected
… +12 more rows
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I. Basic Information for CVE-2026-64206

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock l2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for pending_rx_work. process_pending_rx() takes the same mutex, so teardown can deadlock against the worker it is flushing. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the l2cap_conn_ready() -> queue_work(..., &conn->pending_rx_work) submit path, the l2cap_conn_del() -> cancel_work_sync(&conn->pending_rx_work) teardown path, and the process_pending_rx() -> mutex_lock(&conn->lock) worker edge. Lockdep WARNING: possible circular locking dependency detected process_pending_rx+0x21/0x2a [vuln_msv] l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv] *** DEADLOCK *** Cancel pending_rx_work before taking conn->lock, matching the existing lock-before-drain ordering used for the two delayed works in the same teardown path. The pending_rx queue is still purged after the work has been cancelled and conn->lock has been acquired.
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 3.16版本存在安全漏洞，该漏洞源于Bluetooth L2CAP在释放连接时正确加锁，可能导致死锁。
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 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 ~ fc0c3b9cf27cfa2a06f66dae1d08c668fe0a2faa -
Linux Linux 3.16 -

II. Public POCs for CVE-2026-64206

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III. Intelligence Information for CVE-2026-64206

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Patches & Fixes for CVE-2026-64206 (8)

Same Patch Batch · Linux · 2026-07-20 · 9 CVEs total

CVE-2026-64188 7.8 HIGH net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink()
CVE-2026-64189 7.8 HIGH netfilter: ipset: fix race between dump and ip_set_list resize
CVE-2026-64191 7.8 HIGH i2c: stub: Reject I2C block transfers with invalid length
CVE-2026-64187 xfs: fail recovery on a committed log item with no regions
CVE-2026-64190 net: team: fix NULL pointer dereference in team_xmit during mode change
CVE-2026-64192 bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized
CVE-2026-64205 i2c: i801: fix hardware state machine corruption in error path
CVE-2026-64207 net/sched: dualpi2: fix GSO backlog accounting

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64206

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