CVE-2026-90091 Linux Kernel Bluetooth L2CAP - Race Condition

Linux kernel Bluetooth L2CAP contains a race condition caused by unsafe lockless read in l2cap_sock_cleanup_listen() accessing l2cap_pi(sk)->chan concurrently with l2cap_sock_kill(), letting attackers cause null pointer dereference and potential denial of service, exploit requires concurrent socket operations.

CVSS base score 8.0 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.35% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Race Condition
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:A/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 the fix for this race condition.

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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