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CVE-2026-53358— Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()

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Bluetooth L2CAP协议中cleanup_listen()函数调用l2cap_chan_close()时锁定顺序不当，可能导致通道关闭过程中的竞争条件。

CVSS 8.8 · High EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3df91ea20e744344100b10ae69a17211fcf5b207< 3634cbdc2eb414b69ffa752ddbe5e0458518e321 affected
3df91ea20e744344100b10ae69a17211fcf5b207< e1c100e2d61bd8c718b7d91fe3e050780a9bf72d affected
3df91ea20e744344100b10ae69a17211fcf5b207< deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9 affected
3df91ea20e744344100b10ae69a17211fcf5b207< 89dec92041717b027216e110599e4f6d6c921b79 affected
3df91ea20e744344100b10ae69a17211fcf5b207< 50dfec218808b148ab4247b1858031b7a32015c5 affected
3df91ea20e744344100b10ae69a17211fcf5b207< 859d3ace791ed878ae9ba5522c7844d960da8f88 affected
3df91ea20e744344100b10ae69a17211fcf5b207< 7555fd885a0603f50e49a655850a1f2bd8a25398 affected
3df91ea20e744344100b10ae69a17211fcf5b207< 8c8e620467a7b51562dbcefbd1f09f288d7d710d affected
… +10 more rows
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I. Basic Information for CVE-2026-53358

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: use chan timer to close channels in cleanup_listen() l2cap_chan_close() removes the channel from conn->chan_l, which must be done under conn->lock. cleanup_listen() runs under the parent sk_lock, so acquiring conn->lock would invert the established conn->lock -> chan->lock -> sk_lock order. Instead of calling l2cap_chan_close() directly, schedule l2cap_chan_timeout with delay 0 to close the channel asynchronously. The timeout handler already acquires conn->lock and chan->lock in the correct order. The timer is only armed when chan->conn is still set: if it is already NULL, l2cap_conn_del() has already processed this channel (l2cap_chan_del + l2cap_sock_teardown_cb + l2cap_sock_close_cb), so there is nothing left to do. If l2cap_conn_del() races in after the timer is armed, __clear_chan_timer() inside l2cap_chan_del() cancels it; if the timer has already fired, the handler returns harmlessly because chan->conn was cleared.
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Bluetooth L2CAP协议中cleanup_listen()函数调用l2cap_chan_close()时锁定顺序不当，可能导致通道关闭过程中的竞争条件。
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 3df91ea20e744344100b10ae69a17211fcf5b207 ~ 3634cbdc2eb414b69ffa752ddbe5e0458518e321 -
Linux Linux 3.4 -

II. Public POCs for CVE-2026-53358

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III. Intelligence Information for CVE-2026-53358

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Patches & Fixes for CVE-2026-53358 (7)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53358

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