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CVE-2026-64587

HIGHCVSS 7/10EPSS 0.18%

Last modified

CVE-2026-64587 is a high-severity vulnerability rated 7/10 on the CVSS scale. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.18%

7.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= e4f2379db6c6823c5d4a4c2c912df00c65de51d7, < abd338da658d7faa8e26cfefc8f83f0066707564; >= e4f2379db6c6823c5d4a4c2c912df00c65de51d7, < 5f29dd540fe5ea3c826fc8ec759ba488b31f9707; >= e4f2379db6c6823c5d4a4c2c912df00c65de51d7, < 6fc7449773748c7b904235a09a67054d78ab1172; >= e4f2379db6c6823c5d4a4c2c912df00c65de51d7, < 81431da777924dddaefa5c9b0ca9da4a93f9df96; >= e4f2379db6c6823c5d4a4c2c912df00c65de51d7, < d0f2386f529807826e7404d40a245ee428f89f62; >= e4f2379db6c6823c5d4a4c2c912df00c65de51d7, < 8efd5dcd31e22a9308b16b107a052fcd568c0a99; >= e4f2379db6c6823c5d4a4c2c912df00c65de51d7, < 8f9adb3605e36f75639de529bb3d66e94194a388; >= e4f2379db6c6823c5d4a4c2c912df00c65de51d7, < 2503d08f8a2de618e5c3a8183b250ff4a2e2d52c
LinuxLinux3.11

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-64587?
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.
How severe is CVE-2026-64587?
CVE-2026-64587 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64587?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST