High 7.8Published Sep 17, 2026

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

Updated under an hour ago (Oct 27, 2026, 3:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	91047a4396a8b1857a6f712a90cf33ec0012b189 builds before 19e154d794eb4d33d99ca4a087b1cea9d5e65786; from 0b0e2bf39cf99e458d991b9df253727e036a7d7d before 3af72bf8f73c519ee562e6963d5ff8e678924f93; from d3b739db5dc6f688a60d56da872fabaf65246032 before 8460dc49c9756a1e9288218060b4d41e1b704905; from b66774b48dd98f07254951f74ea6f513efe7ff8b before f49321c85785178214fd67f2e9b4b73d6363783b; from b66774b48dd98f07254951f74ea6f513efe7ff8b before ca2c4c26498643f421d35ffe258fafbd3ed461c3; 8f90405a4a6f1f1880dc07996b47bf57c712bd8a; 32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b; 8922c7940bae9ce4b1736dddb6362370793835c2; and 8 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/19e154d794eb4d33d99ca4a087b1cea9d5e65786
https://git.kernel.org/stable/c/3af72bf8f73c519ee562e6963d5ff8e678924f93
https://git.kernel.org/stable/c/8460dc49c9756a1e9288218060b4d41e1b704905
https://git.kernel.org/stable/c/f49321c85785178214fd67f2e9b4b73d6363783b
https://git.kernel.org/stable/c/ca2c4c26498643f421d35ffe258fafbd3ed461c3

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.