CVE-2026-19935 Zephyr Bluetooth LE - Use After Free

Zephyr Bluetooth LE host contains a use-after-free caused by improper cancellation of deferred L2CAP channel RX work in l2cap_chan_destroy(), letting remote unauthenticated peers with established CoC channels cause memory corruption or denial of service, exploit requires an established CoC channel.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.18% 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:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
11 October 2026
Updated
15 October 2026
Weakness
CWE-416

Vendor fix

Update to the latest Zephyr version with the fix for proper cancellation of L2CAP RX work in l2cap_chan_destroy().

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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