Linux Kernel up to 6.12.112/6.18.55/7.2.9/7.3-rc5 Dummy-HCD Driver race condition

CVSS Meta Temp Score
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CTI Interest Score
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3.3$0-$5k0.91

Summaryinfo

A vulnerability categorized as problematic has been discovered in Linux Kernel up to 6.12.112/6.18.55/7.2.9/7.3-rc5. The affected element is an unknown function of the component Dummy-HCD Driver. The manipulation results in race condition. This vulnerability is known as CVE-2026-98765. Attacking locally is a requirement. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 6.12.112/6.18.55/7.2.9/7.3-rc5. Affected is an unknown functionality of the component Dummy-HCD Driver. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: USB: gadget: dummy-hcd: Fix wait for outstanding request completions The dummy-hcd driver emulates synchronize_irq() by waiting until its private callback_usage counter drops to 0 (with the private lock not held). This counter is incremented whenever a gadget driver callback occurs (which requires the private lock to be dropped), but not when a request completion handler is called. This is an oversight. Request completion is triggered by timer interrupts (emulating device IRQs in a real UDC), and the interrupt handlers are supposed to have completed when the synchronize_irq() emulation routine returns -- they aren't supposed to be in the middle of a completion callback. If this happens it can lead to a gadget driver's unbind routine running before all outstanding request completions have finished, maybe even allowing the gadget driver's module to be unloaded while a completion handler is still running. Fix the oversight by incrementing the callback_usage value across request completion callbacks.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-98765 since 09/25/2026. The exploitability is told to be easy. Local access is required to approach this attack. The exploitation requires an enhanced level of successful authentication. The technical details are unknown and an exploit is not available.

Upgrading to version 6.12.113, 6.18.56, 7.2.10 or 7.3-rc6 eliminates this vulnerability. Applying the patch 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2/5298c96bf0068f3160969f7ddad81976d01a9b66/3070806a7bc7bb36ed04a21022c09dafcc5619f4/b263ff9b0fc5c1f371d65c4eb196b31263d039ff is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.4
VulDB Meta Temp Score: 3.3

VulDB Base Score: 3.4
VulDB Temp Score: 3.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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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 6.12.113/6.18.56/7.2.10/7.3-rc6
Patch: 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2/5298c96bf0068f3160969f7ddad81976d01a9b66/3070806a7bc7bb36ed04a21022c09dafcc5619f4/b263ff9b0fc5c1f371d65c4eb196b31263d039ff

Timelineinfo

09/25/2026 CVE reserved
10/18/2026 +23 days Advisory disclosed
10/18/2026 +0 days VulDB entry created
10/18/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98765 (🔒)
GCVE (CVE): GCVE-0-2026-98765
GCVE (VulDB): GCVE-100-422010

Entryinfo

Created: 10/18/2026 19:48
Changes: 10/18/2026 19:48 (58)
Complete: 🔍
Cache ID: 216::103

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