CVE-2026-90093 Linux kernel Bluetooth L2CAP - Use After Free

Linux kernel Bluetooth L2CAP contains a use-after-free vulnerability caused by unsafe access to chan->conn in get/setsockopt, letting local attackers cause kernel crashes, exploit requires local access.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing commit b66774b48dd9 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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