Is there a public exploit for CVE-2026-85035?

No public exploit for CVE-2026-85035 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-2026-85035?

CVE-2026-85035 scores CVSS 8.8 (v3.1), rated high.

What does CVE-2026-85035 affect?

CVE-2026-85035 affects zephyrproject Zephyr.

8.8 High

The canaddrxfiltermsgq() system call installs a CAN RX filter whose callback (canmsgqput() in drivers/can/cancommon.c) is handed the…

CVE-2026-85035

The canaddrxfiltermsgq() system call installs a CAN RX filter whose callback (canmsgqput() in drivers/can/cancommon.c) is handed the caller's struct kmsgq as userdata. The controller driver stores that raw pointer in its filter table and dereferences it from the RX path every time a matching frame arrives. The system call verifier zvrfycanaddrxfiltermsgq() in drivers/can/canhandlers.c validated the queue only with KSYSCALLOBJ(), which is a point-in-time check of type, initialization and caller permission and says nothing about the object's lifetime. On a build with CONFIGUSERSPACE=y and CONFIGDYNAMICOBJECTS=y, an unprivileged user-mode thread that has been granted access to a CAN device can obtain a message queue whose lifetime it fully controls: kobjectalloc(KOBJMSGQ) followed by kmsgqallocinit(). The lifetime of such an object is driven solely by its permission bitmask, and a pointer retained by the kernel is not represented there. After registering the filter, the thread calls kobjectrelease() — or simply terminates — and unrefcheck() frees the struct kmsgq storage while the CAN driver still holds the pointer. The next matching CAN frame causes kmsgqput() to run in supervisor…

Assessment

CVSS: 8.8 (v3.1)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 3 November 2026
Last updated: 3 November 2026
Affected: zephyrproject · Zephyr
Assigner: zephyr

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

At the source

EUVD (ENISA)

References

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