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CVE-2026-98765

USB: gadget: dummy-hcd: Fix wait for outstanding request completions

Products / packages Linux

Published

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Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:05:32 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

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.

Excerpt from the original source description below.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

20 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 → before 32721319e89a2be610b0518b88f0d188ce878063

git versions

7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 → before 48ef54100ceffbd1a055f193873574c45f408eb5

git versions

7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 → before d77cc7c0d739fb17413714c5c4914bd396502e20

git versions

7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 → before 6849e51b89de5b6fc7447dc8e612b58df19c7dea

git versions

7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 → before 7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2

git versions

7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 → before 5298c96bf0068f3160969f7ddad81976d01a9b66

git versions

7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 → before 3070806a7bc7bb36ed04a21022c09dafcc5619f4

git versions

7dbd8f4cabd96db5a50513de9d83a8105a5ffc81 → before b263ff9b0fc5c1f371d65c4eb196b31263d039ff

git versions

7b416b9dac6ede26d4ca0c1a88b448b543623ff3

git versions

8590bc1da625dd4a589eac0fc3aa3cf4f400424d

git versions

a867d5b932ac4911d3f8a1e63505061b0c81f889

git versions

e84b4a008365b7edbd842a063ae28d040a98db25

git versions

e39b17143a5b5aac81f066d455e5d3a9877eb3ae

git versions

4f8ae1fcb0dfbb72a7678f81bf01fb7fc85c6715

git versions

3.2.97 → before 3.3

semver versions

3.16.52 → before 3.17

semver versions

4.1.46 → before 4.2

semver versions

4.4.92 → before 4.5

semver versions

4.9.55 → before 4.10

semver versions

4.13.6 → before 4.14

semver versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

10 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.14

unaffected

0 → before 4.14

semver versions

5.10.273 → through 5.10.*

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.160 → through 6.6.*

semver versions

6.12.113 → through 6.12.*

semver versions

6.18.56 → through 6.18.*

semver versions

7.2.10 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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.

References

8 sources
git.kernel.org/stable/c/32721319e89a2be610b0518b88f0d188ce878063
Source referenceLinux
git.kernel.org/stable/c/48ef54100ceffbd1a055f193873574c45f408eb5
Source referenceLinux
git.kernel.org/stable/c/d77cc7c0d739fb17413714c5c4914bd396502e20
Source referenceLinux
git.kernel.org/stable/c/6849e51b89de5b6fc7447dc8e612b58df19c7dea
Source referenceLinux
git.kernel.org/stable/c/7ce4dca0d53b1c3cb2b7e7bb2e42bf5db860caf2
Source referenceLinux
git.kernel.org/stable/c/5298c96bf0068f3160969f7ddad81976d01a9b66
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/3070806a7bc7bb36ed04a21022c09dafcc5619f4
Source referenceLinux
git.kernel.org/stable/c/b263ff9b0fc5c1f371d65c4eb196b31263d039ff
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-98765

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.14

Before: 5.10.273

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.14

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.14

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.14

Before: 6.6.160

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.14

Before: 6.12.113

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.14

Before: 6.18.56

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.14

Before: 7.2.10

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.14

Before: 7.3

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.2.97

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 3.16.52

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.1.46

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.4.92

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.9.55

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.13.6

Applicability preview
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Contributing organizations · 1
Linux

Assigning organization

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.