# CVE-2026-64587: linux: In the Linux kernel, the following vulnerability has been resolved:  net: ethernet: arc: emac: quiesce interrupts bef...

CVE-2026-64587 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-64587, released August 6, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-64587
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 6, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.170-1 | [DEBIAN-CVE-2026-64587](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64587.md) | Aug 6, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.85-1 | [DEBIAN-CVE-2026-64587](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64587.md) | Aug 6, 2026 |
| Linux | linux Debian 14 | 6.19.10-1 | [DEBIAN-CVE-2026-64587](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64587.md) | Aug 6, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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