CVE-2026-64587

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: ethernet: arc: emac: quiesce interrupts before requesting IRQ

Normal RX/TX interrupts are enabled later, in arc_emac_open(), so probe

should not see interrupt delivery in the usual case. However, hardware may

still present stale or latched interrupt status left by firmware or the

bootloader.

If probe later unwinds after devm_request_irq() has installed the handler,

such a stale interrupt can still reach arc_emac_intr() during teardown and

race with release of the associated net_device.

Avoid that window by putting the device into a known quiescent state before

requesting the IRQ: disable all EMAC interrupt sources and clear any

pending EMAC interrupt status bits. This keeps the change hardware-focused

and minimal, while preventing spurious IRQ delivery from leftover state.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References