CVE-2026-64587 Details
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.
A vulnerability exists in the Linux kernel's ARC EMAC Ethernet driver, specifically in how it manages interrupt requests. The issue arises because the driver can receive stale or latched interrupt signals from the hardware, left by the firmware or bootloader. This can occur if the driver's interrupt handler is installed before the driver has fully initialized, leading to a race condition during the driver's teardown process. The vulnerability affects several versions of the Linux kernel.
The vulnerability has been addressed by modifying the driver to clear any pending interrupt status and disable all interrupt sources before requesting the interrupt handler. This change ensures that no stale interrupts are delivered, preventing the race condition during the device's teardown.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 8, 2026 | CVE Modified | kernel.org |
| Aug 6, 2026 | New CVE Received | kernel.org |