CVE-2026-64333

Local kernel code execution via busy URB resubmission

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds write in the Linux Kernel digi_acceleport driver allows local users to execute kernel code through an open Digi ttyUSB device. digi_write_inb_command() updates the transfer buffer and resubmits an occupied URB after timeout, while a broken jiffies test expires no-timeout commands immediately. Ordinary permission to open the attached adapter's tty node is required; corruption can disclose kernel memory, overwrite kernel data, panic, or hang the host.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux Kernel digi_acceleport driver allows local users to execute kernel code through an open Digi ttyUSB device. digi_write_inb_command() updates the transfer buffer and resubmits an occupied URB after timeout, while a broken jiffies test expires no-timeout commands immediately. Ordinary permission to open the attached adapter's tty node is required; corruption can disclose kernel memory, overwrite kernel data, panic, or hang the host.

The record

CVE
CVE-2026-64333
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
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 <1243f120790042c2ac92e84e797dacc75fff4366
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <24ca1fea8f2753bf33e1d458ec1ae5d9b7796a65
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f296974acc279f05f284441bfe3064074958d11
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d9dc88bdf8897788b0eed57113e9eca7fd42ea9
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <699dfb6917503b3cda4d5da6941cf79c3c1b4c8b
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a274b3794fe1852c3d9fe6d900b94053c0b03410
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a3a13fdc53103b07335918e2cdeb465038a71725
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e60e4873e9178da9f4f2674e4c2ff085d5a84f79
  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 <1243f120790042c2ac92e84e797dacc75fff4366; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <24ca1fea8f2753bf33e1d458ec1ae5d9b7796a65; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2f296974acc279f05f284441bfe3064074958d11; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5d9dc88bdf8897788b0eed57113e9eca7fd42ea9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <699dfb6917503b3cda4d5da6941cf79c3c1b4c8b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a274b3794fe1852c3d9fe6d900b94053c0b03410; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a3a13fdc53103b07335918e2cdeb465038a71725; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e60e4873e9178da9f4f2674e4c2ff085d5a84f79; version=2.6.12

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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

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Your stack

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