CVE-2026-90093
Received
Received - Intake
BaseFortify
Vulnerability report for CVE-2026-90093, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-17
Last updated on: 2026-09-18
Assigner: kernel.org
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | b66774b48dd98f07254951f74ea6f513efe7ff8b |
| Linux | Linux | b66774b48dd98f07254951f74ea6f513efe7ff8b |
| Linux | Linux | 8f90405a4a6f1f1880dc07996b47bf57c712bd8a |
| Linux | Linux | 32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b |
| Linux | Linux | 8922c7940bae9ce4b1736dddb6362370793835c2 |
| Linux | Linux | 91047a4396a8b1857a6f712a90cf33ec0012b189 |
| Linux | Linux | 0b0e2bf39cf99e458d991b9df253727e036a7d7d |
| Linux | Linux | d3b739db5dc6f688a60d56da872fabaf65246032 |
| Linux | Linux | 50c38d9f42a529691e4e67ea9cedf4f0bfc8d277 |
| Linux | Linux | 5.10.265 |
| Linux | Linux | 5.15.216 |
| Linux | Linux | 6.1.183 |
| Linux | Linux | 6.6.145 |
| Linux | Linux | 6.12.97 |
| Linux | Linux | 6.18.39 |
| Linux | Linux | 7.1.4 |
| Linux | Linux | 7.2 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
