CVE-2026-64335

Port reception loss via stale throttle state

Published Jul 25, 2026 · Updated Jul 25, 2026

Availability failure in the Linux Kernel digi_acceleport USB serial driver allows attackers to stop port reception. When a throttled port is closed, digi_close leaves the restart state set, and digi_open fails to clear the throttle flags or resubmit the read URB. The condition requires access to close and reopen a throttled Digi AccelePort port; reception remains blocked until device reconnection or driver rebinding.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Availability failure in the Linux Kernel digi_acceleport USB serial driver allows attackers to stop port reception. When a throttled port is closed, digi_close leaves the restart state set, and digi_open fails to clear the throttle flags or resubmit the read URB. The condition requires access to close and reopen a throttled Digi AccelePort port; reception remains blocked until device reconnection or driver rebinding.

The record

CVE
CVE-2026-64335
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4f3f6f44db71e469933a7c36c5d57d937ba0a21b
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61954033326fc7e637ed2aeeb4b52021e0ee4657
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <83a3dfc018943b05b6daf3a6f891833e1aabfa1f
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8d50a910194f66566a5eb252b33283855c8d5203
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <92fa3e1a49848509ea3f7995751963fc65095998
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <abacd67e6f689c62d8a13e3da25f4272bc9ad4af
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5d2660caef78d4c996d34d123574c8e86f5b5ac
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eab394781e9321c0c7e97a24fd092387cb262f40
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4f3f6f44db71e469933a7c36c5d57d937ba0a21b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <61954033326fc7e637ed2aeeb4b52021e0ee4657; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <83a3dfc018943b05b6daf3a6f891833e1aabfa1f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8d50a910194f66566a5eb252b33283855c8d5203; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <92fa3e1a49848509ea3f7995751963fc65095998; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <abacd67e6f689c62d8a13e3da25f4272bc9ad4af; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d5d2660caef78d4c996d34d123574c8e86f5b5ac; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <eab394781e9321c0c7e97a24fd092387cb262f40; version=2.6.12

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/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.

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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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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