Is there a public exploit for CVE-2026-87041?

No public exploit for CVE-2026-87041 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-2026-87041?

CVE-2026-87041 scores CVSS 7.8 (v3.1), rated high.

What does CVE-2026-87041 affect?

CVE-2026-87041 affects zephyrproject Zephyr.

7.8 High

The RTIO submission-queue verifier rtiovrfysqe() in subsys/rtio/rtiosyscalls.c (subsys/rtio/rtiohandlers.c before v4.3.0) accumulated the…

CVE-2026-87041

The RTIO submission-queue verifier rtiovrfysqe() in subsys/rtio/rtiosyscalls.c (subsys/rtio/rtiohandlers.c before v4.3.0) accumulated the results of KSYSCALLMEMORY() into its validsqe flag with &=. That macro returns nonzero on failure (it is built on KSYSCALLVERIFYMSG(), which yields !(expr)), so every buffer permission check contributed the opposite of its result. A submission whose tx.buf, rx.buf or txrx.txbuf/txrx.rxbuf pointer was not accessible to the calling thread was accepted, while a legitimate, thread-owned buffer caused the calling thread to be killed with a kernel oops. The verifier runs on behalf of the rtiosqecopyingethandles() system call (also reached through the inline rtiosqecopyin() wrapper), so it is driven directly by untrusted user-mode input on any image built with CONFIGUSERSPACE. A user thread that has been granted an RTIO context and an rtioiodev object — the intended usage of RTIO userspace support, established via rtioaccessgrant() — can submit an SQE whose buffer pointer and length name arbitrary kernel memory; the object check on sqe->iodev is unaffected and still passes, and the crafted SQE is forwarded to the bus driver unchanged. Downstream…

Assessment

CVSS: 7.8 (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: 4 November 2026
Last updated: 4 November 2026
Affected: zephyrproject · Zephyr
Assigner: zephyr

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

At the source

EUVD (ENISA)

References

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