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CVE-2026-90093— Bluetooth: L2CAP: access chan->conn safely in get/setsockopt

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，已解决以下漏洞： Bluetooth: L2CAP: 在 get/setsockopt 中安全访问 chan->conn 自提交 b66774b48dd9（“Bluetooth: L2CAP: 通过持有 conn 引用修复通道超时引发的 UAF”）之后， 持有了引用计数，即使对应的 已被删除，该指针仍保持非空。在此状态下，访问诸如 等字段是无效的，这会导致在 中访问 时触发 KASAN 崩溃。 在 中使用 之前，需先检查 是否指向一个存活的 。在 / 中持有 ，以确保连接存活，并避免 字段的

CVSS 7.8 · High EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux b66774b48dd98f07254951f74ea6f513efe7ff8b< f49321c85785178214fd67f2e9b4b73d6363783b affected
b66774b48dd98f07254951f74ea6f513efe7ff8b< ca2c4c26498643f421d35ffe258fafbd3ed461c3 affected
8f90405a4a6f1f1880dc07996b47bf57c712bd8a affected
32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b affected
8922c7940bae9ce4b1736dddb6362370793835c2 affected
91047a4396a8b1857a6f712a90cf33ec0012b189 affected
0b0e2bf39cf99e458d991b9df253727e036a7d7d affected
d3b739db5dc6f688a60d56da872fabaf65246032 affected
… +12 more rows
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I. Basic Information for CVE-2026-90093

Vulnerability Information
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Vulnerability Title
Bluetooth: L2CAP: access chan->conn safely in get/setsockopt
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: access chan->conn safely in get/setsockopt Since commit b66774b48dd9 ("Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref") l2cap_chan::conn has held reference and remains non-NULL also after the corresponding hci_conn is deleted. In this state accessing various fields eg. hci_conn::hdev is invalid, which leads to KASAN crash in l2cap_sock_setsockopt() access of conn->hcon->hdev. Check l2cap_chan::conn.hcon corresponds to an alive hci_conn before trying to use it in l2cap_sock.c. Hold l2cap_chan_lock() in getsockopt/setsockopt to ensure it stays alive, and to avoid data races in l2cap_chan fields.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/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 b66774b48dd98f07254951f74ea6f513efe7ff8b ~ f49321c85785178214fd67f2e9b4b73d6363783b -
Linux Linux 7.2 -

II. Public POCs for CVE-2026-90093

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III. Intelligence Information for CVE-2026-90093

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Patches & Fixes for CVE-2026-90093 (2)

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

CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
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-2026-90110 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-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
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
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash

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-2026-90093

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