Is there a public exploit for CVE-2026-90585?

No public exploit for CVE-2026-90585 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-2026-90585?

CVE-2026-90585 scores CVSS 4.6 (v3.1), rated medium.

What does CVE-2026-90585 affect?

CVE-2026-90585 affects zephyrproject Zephyr.

4.6 Medium

The Renesas RA SCI UART driver's receive-error ISR, uartrascieriisr() in drivers/serial/uartrenesasrasci.c, acknowledged the error…

CVE-2026-90585

The Renesas RA SCI UART driver's receive-error ISR, uartrascieriisr() in drivers/serial/uartrenesasrasci.c, acknowledged the error condition only when a Zephyr interrupt-driven callback had already been registered. With CONFIGUARTINTERRUPTDRIVEN=y and CONFIGUARTASYNCAPI=n, if data->usercb is NULL the ISR body is empty: the SCI error flags (SSR.ORER, SSR.FER, SSR.PER) are left set and the ICU event flag RICU->IELSRb[eriirq].IR is never cleared, so the interrupt re-pends immediately and the ISR is re-entered without end. The error interrupt is masked at boot by uartrasciinit(), but FSP's RSCIUARTOpen() unconditionally re-enables it, and uartrasciconfigure() - the back end of the public uartconfigure() API, enabled by default via CONFIGUARTUSERUNTIMECONFIGURE - performs a Close()/Open() pair without re-masking it. Any runtime uartconfigure() therefore leaves the error interrupt live regardless of whether a callback has been set, as does calling uartirqerrenable() on its own. An instance used with the polling API, or the window between uartconfigure() and uartirqcallbackuserdataset(), thus runs with the error interrupt unmasked and no callback registered. The trigger is an ordinary…

Assessment

CVSS: 4.6 (v3.1)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 9 November 2026
Last updated: 9 November 2026
Affected: zephyrproject · Zephyr
Assigner: zephyr

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

At the source

EUVD (ENISA)

References

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