Is there a public exploit for CVE-2026-78117?

No public exploit for CVE-2026-78117 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-78117?

CVE-2026-78117 scores CVSS 4.2 (v3.1), rated medium. EPSS puts the chance of exploitation in the next 30 days at 0.16%.

What does CVE-2026-78117 affect?

CVE-2026-78117 affects zephyrproject Zephyr.

4.2 Medium

The Infineon PSOC 6 BLESS HCI driver in drivers/bluetooth/hci/hciinfineonpsoc6bless.c stored the outgoing HCI packet descriptor in a…

CVE-2026-78117

The Infineon PSOC 6 BLESS HCI driver in drivers/bluetooth/hci/hciinfineonpsoc6bless.c stored the outgoing HCI packet descriptor in a file-scope variable, static cystcblehcitxpacketinfot hcitxpkt. psoc6blesssend() cleared and populated that descriptor's packetType, dataLength and data fields before acquiring psoc6blessoperationsem, so the driver's serialising semaphore protected only the call into CyBLESoftHciSendAppPkt() and not the shared state that call reads. The Bluetooth host does not guarantee a single HCI sender. Most transmissions are funnelled through the cooperative TX-processor work queue, but bthcicmdsend() deliberately bypasses btdev.cmdtxqueue for BTHCIOPHOSTNUMCOMPLETEDPACKETS and calls btsend() directly from the caller's thread; that caller is bthcihostnumcompletedpackets(), the aclinpool destroy callback, which runs on whichever thread drops the last reference to a received ACL buffer. CONFIGBTHCIACLFLOWCONTROL defaults to y on this driver's boards, and an application that returns -EINPROGRESS from its L2CAP recv callback and later calls btl2capchanrecvcomplete() performs that unref from its own preemptible thread. A remote peer that generates Bluetooth traffic…

Assessment

CVSS: 4.2 (v3.1)
Severity: Medium
EPSS: 0.16% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 21 October 2026
Last updated: 4 November 2026
Affected: zephyrproject · Zephyr
Assigner: zephyr

CVSS vectorCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

At the source

EUVD (ENISA)

References

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