CVE-2026-64587: net: ethernet: arc: emac: quiesce interrupts before requesting IRQ
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 arcemacopen(), 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 devmrequestirq() has installed the handler, such a stale interrupt can still reach arcemacintr() during teardown and race with release of the associated netdevice.
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
Recommended actions to resolve this vulnerability, in priority order.
- Compensating control
Quiesce/disable all EMAC interrupt sources and clear any pending EMAC interrupt status bits before requesting the IRQ, to prevent spurious IRQ delivery from leftover/stale interrupt state reaching arc_emac_intr() during teardown.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64587?
CVE-2026-64587 has a risk rating of 13, indicating a significant vulnerability.
How do I fix CVE-2026-64587?
To resolve CVE-2026-64587, ensure that your Linux kernel is updated to the latest version where this vulnerability is patched.
What systems are affected by CVE-2026-64587?
CVE-2026-64587 affects systems running vulnerable versions of the Linux kernel with specific Ethernet drivers.
What kind of attacks can exploit CVE-2026-64587?
CVE-2026-64587 can potentially allow for denial-of-service attacks due to improper interrupt handling.
Is CVE-2026-64587 a remote or local vulnerability?
CVE-2026-64587 is primarily a local vulnerability that could be exploited by users with local access to the affected system.