CVE-2026-64587

Local teardown race via stale EMAC interrupt

Published Aug 6, 2026 · Updated Aug 6, 2026

A teardown race in the Linux ARC EMAC driver allows local users to reach a releasing net_device through a stale interrupt. The probe path requests the IRQ without first disabling EMAC interrupt sources or clearing pending status, so arc_emac_intr() can run while teardown releases the associated net_device. Reachability requires ARC EMAC hardware with latched firmware or bootloader status plus probe failure; Linux has not described a concrete post-race outcome.

CVSS severity7.0
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

A teardown race in the Linux ARC EMAC driver allows local users to reach a releasing net_device through a stale interrupt. The probe path requests the IRQ without first disabling EMAC interrupt sources or clearing pending status, so arc_emac_intr() can run while teardown releases the associated net_device. Reachability requires ARC EMAC hardware with latched firmware or bootloader status plus probe failure; Linux has not described a concrete post-race outcome.

The record

CVE
CVE-2026-64587
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.11
  2. Affected versionversion=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <2503d08f8a2de618e5c3a8183b250ff4a2e2d52c
  3. Affected versionversion=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <5f29dd540fe5ea3c826fc8ec759ba488b31f9707
  4. Affected versionversion=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <6fc7449773748c7b904235a09a67054d78ab1172
  5. Affected versionversion=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <81431da777924dddaefa5c9b0ca9da4a93f9df96
  6. Affected versionversion=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <8efd5dcd31e22a9308b16b107a052fcd568c0a99
  7. Affected versionversion=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <8f9adb3605e36f75639de529bb3d66e94194a388
  8. Affected versionversion=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <abd338da658d7faa8e26cfefc8f83f0066707564
  9. Affected versionversion=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <d0f2386f529807826e7404d40a245ee428f89f62

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.11; version=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <2503d08f8a2de618e5c3a8183b250ff4a2e2d52c; version=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <5f29dd540fe5ea3c826fc8ec759ba488b31f9707; version=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <6fc7449773748c7b904235a09a67054d78ab1172; version=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <81431da777924dddaefa5c9b0ca9da4a93f9df96; version=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <8efd5dcd31e22a9308b16b107a052fcd568c0a99; version=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <8f9adb3605e36f75639de529bb3d66e94194a388; version=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <abd338da658d7faa8e26cfefc8f83f0066707564; version=e4f2379db6c6823c5d4a4c2c912df00c65de51d7 <d0f2386f529807826e7404d40a245ee428f89f62

Published CVSS scores

7.0LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

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