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CVE-2026-90092— Bluetooth: L2CAP: reject accept queue add unless BT_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.

在 Linux 内核中，以下漏洞已得到修复： Bluetooth: L2CAP: 拒绝在状态非 BT_LISTEN 时向接受队列添加连接 在 中执行 之后，父套接字的接受队列不应再添加新的套接字（sk），因为此时 已被设置为 。如果在此状态下仍向接受队列添加新 sk，可能导致对已失效的父引用进行解引用，从而引发 use-after-free（UAF，释放后使用） 漏洞。 根本原因： 可能与父级 的拆卸过程发生竞态条件，这是因为对 的访问缺乏一致的锁保护： 修复方式： 在 中，在获取套接字锁后，增加对 的检查。同时，

CVSS 8.0 · High EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1548.004 · Elevated Execution with Prompt

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux 0c17c8832562b2aac288e89cefd0f46074f54bcb< bf61a65c6093970e3b50031c4b79ebf3bd411eba affected
5105f3e6b2df619c635b5f6a49fac131a36c7952< 491e4c60017969b053888029998d2a61f298986a affected
c88c185ae0a1067823661b220aeea613df2c127b< 2a3a27aaf19bf069720e024ce6fde54e6bf80df9 affected
1810e42ff6716f320c7269d5850eca48b07b7427< 87276dc15b559d32757a43b4415c8445fbae06c4 affected
2ff1a41a912de8517b4482e946dd951b7d80edbf< c47339e169bf4a0a4cfabb91351471f67744c2bc affected
2ff1a41a912de8517b4482e946dd951b7d80edbf< d4bfa78fd67929b62b02013c107973e0c5b7aa9a affected
1b1c0da227bf63479bac9982fc8d12df9aaea0fb affected
85426e97dc72f2088ba6d27e74cd58c3fbd43e31 affected
… +16 more rows
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I. Basic Information for CVE-2026-90092

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: reject accept queue add unless BT_LISTEN
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: reject accept queue add unless BT_LISTEN New sk should not be added to parent socket accept queue after last l2cap_sock_cleanup_listen() has run in l2cap_sock_teardown_cb() and state set to BT_CLOSED, as that can result to UAF on dereferencing the dangling parent reference. l2cap_sock_new_connection_cb() may race with parent l2cap_chan teardown, due to chan->state accessed without consistent locking: [Task 1] [Task 2] l2cap_sock_release(parent) l2cap_connect l2cap_sock_shutdown pchan = l2cap_global_chan_by_psm l2cap_chan_lock(pchan) l2cap_chan_close l2cap_sock_teardown_cb pchan->state = BT_CLOSED l2cap_chan_unlock(pchan) ------> l2cap_chan_lock(pchan) l2cap_new_connection l2cap_sock_new_connection_cb l2cap_chan_lock(pchan) <-------- l2cap_chan_unlock(pchan) l2cap_sock_kill(parent) /* bt_sk(sk)->parent dangling */ Fix by adding check for sk_state == BT_LISTEN after acquiring sk lock in l2cap_sock_new_connection_cb(). Add lock_sock() around sk_state writes where missing, to avoid data races. Although the data races on pchan->state should be fixed too, this defensive sk_state check probably makes sense in any case.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0c17c8832562b2aac288e89cefd0f46074f54bcb ~ bf61a65c6093970e3b50031c4b79ebf3bd411eba -
Linux Linux 7.1 -

II. Public POCs for CVE-2026-90092

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III. Intelligence Information for CVE-2026-90092

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Patches & Fixes for CVE-2026-90092 (6)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90092

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