Is there a public exploit for CVE-2026-90590?

No public exploit for CVE-2026-90590 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-2026-90590?

CVE-2026-90590 scores CVSS 6.5 (v3.1), rated medium.

What does CVE-2026-90590 affect?

CVE-2026-90590 affects zephyrproject Zephyr.

6.5 Medium

The NXP ENET QoS Ethernet driver in drivers/ethernet/ethnxpenetqos serialises transmission with a binary semaphore, data->tx.txsem, taken…

CVE-2026-90590

The NXP ENET QoS Ethernet driver in drivers/ethernet/ethnxpenetqos serialises transmission with a binary semaphore, data->tx.txsem, taken in ethnxpenetqostx() and returned only by the transmit-completion interrupt handler txdmadone(). A frame that has been handed to the transmit DMA when the Ethernet link goes down is never written back, so that completion interrupt never arrives. The PHY callback ethnxpenetqosphycb() reacts to carrier loss only by calling netethcarrierset(); it does not stop the DMA, take the descriptors back or release the outstanding frame, and no timeout exists to do so. The trigger is a link-down/link-up transition that lands while a frame is under the transmit DMA. It can be produced by anyone who controls the link partner or the cable — for example by administratively downing and restoring the attached switch port, or by restarting auto-negotiation from a peer device — and can be made reliable by generating traffic that keeps the device transmitting and repeating the transition. No credentials or user interaction are required, and the trigger is at the link layer rather than over IP. Because the semaphore is never given back, every subsequent call to…

Assessment

CVSS: 6.5 (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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

At the source

EUVD (ENISA)

References

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