Linux Kernel up to 6.19.8 arc_emac arc_emac_intr race condition

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k1.81

Summaryinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 6.19.8. Affected by this issue is the function arc_emac_intr of the component arc_emac. This manipulation causes race condition. This vulnerability is tracked as CVE-2026-64587. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability classified as very critical was found in Linux Kernel up to 6.19.8. Affected by this vulnerability is the function arc_emac_intr of the component arc_emac. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-64587 since 07/19/2026. The exploitation appears to be easy. An attack has to be approached locally. Additional levels of successful authentication are required for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/06/2026).

Upgrading to version 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19 or 6.19.9 eliminates this vulnerability. Applying the patch abd338da658d7faa8e26cfefc8f83f0066707564/5f29dd540fe5ea3c826fc8ec759ba488b31f9707/6fc7449773748c7b904235a09a67054d78ab1172/81431da777924dddaefa5c9b0ca9da4a93f9df96/d0f2386f529807826e7404d40a245ee428f89f62/8efd5dcd31e22a9308b16b107a052fcd568c0a99/8f9adb3605e36f75639de529bb3d66e94194a388/2503d08f8a2de618e5c3a8183b250ff4a2e2d52c is able to eliminate this problem.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.253/5.15.203/6.1.167/6.6.130/6.12.78/6.18.19/6.19.9
Patch: abd338da658d7faa8e26cfefc8f83f0066707564/5f29dd540fe5ea3c826fc8ec759ba488b31f9707/6fc7449773748c7b904235a09a67054d78ab1172/81431da777924dddaefa5c9b0ca9da4a93f9df96/d0f2386f529807826e7404d40a245ee428f89f62/8efd5dcd31e22a9308b16b107a052fcd568c0a99/8f9adb3605e36f75639de529bb3d66e94194a388/2503d08f8a2de618e5c3a8183b250ff4a2e2d52c

Timelineinfo

07/19/2026 CVE reserved
08/06/2026 +18 days Advisory disclosed
08/06/2026 +0 days VulDB entry created
08/06/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64587 (🔒)
GCVE (CVE): GCVE-0-2026-64587
GCVE (VulDB): GCVE-100-386497

Entryinfo

Created: 08/06/2026 09:41
Changes: 08/06/2026 09:41 (59)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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