CVE-2026-90256 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in Bluetooth L2CAP due to unprotected access to l2cap_data in l2cap_disconn_ind, letting attackers cause memory corruption, exploit requires concurrent deletion of l2cap_conn.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.34% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Use After Free
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/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.

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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