CVE-2026-53194

Memory corruption via oversized USB serial write

Published Jun 25, 2026 · Updated Jun 25, 2026

Out-of-bounds write in the kl5kusb105 USB serial driver in Linux Kernel allows local users to corrupt kernel memory through TTY writes. klsi_105_prepare_write_buffer reserves a two-byte header but copies up to the full 64-byte buffer size at a two-byte offset, overwriting the slab allocation. The driver must be present and its TTY must receive at least 64 bytes; the overwrite extends two bytes beyond the allocated buffer.

CVSS severity7.8
High
EPSS probability0.20%
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 kl5kusb105 USB serial driver in Linux Kernel allows local users to corrupt kernel memory through TTY writes. klsi_105_prepare_write_buffer reserves a two-byte header but copies up to the full 64-byte buffer size at a two-byte offset, overwriting the slab allocation. The driver must be present and its TTY must receive at least 64 bytes; the overwrite extends two bytes beyond the allocated buffer.

The record

CVE
CVE-2026-53194
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 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=2.6.35
  2. Affected versionversion=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <0a57320f71941d4e0b1307453c9a1f0939afe666
  3. Affected versionversion=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <14147b7963685957839c76ba8094924e22777d79
  4. Affected versionversion=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <372f33ebed747d91870f57c0a2e62884a870bffa
  5. Affected versionversion=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <60af1fd82983c26604102e63a3fcc822c186cceb
  6. Affected versionversion=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <70d86e355c564b5510fde61361df014f5476c83e
  7. Affected versionversion=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <96d47e40bf9db4a9efd5c8fb53287a508d165f14
  8. Affected versionversion=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <a1288cd700f721c1a119c4f1e8efa234e59caada
  9. Affected versionversion=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <bde742b076cbe26ecc89c8c68c76ae076a524d02

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.35; version=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <0a57320f71941d4e0b1307453c9a1f0939afe666; version=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <14147b7963685957839c76ba8094924e22777d79; version=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <372f33ebed747d91870f57c0a2e62884a870bffa; version=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <60af1fd82983c26604102e63a3fcc822c186cceb; version=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <70d86e355c564b5510fde61361df014f5476c83e; version=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <96d47e40bf9db4a9efd5c8fb53287a508d165f14; version=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <a1288cd700f721c1a119c4f1e8efa234e59caada; version=60b3013cdaf3fa8a17243ca46b19db3cbe08d943 <bde742b076cbe26ecc89c8c68c76ae076a524d02

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3Red Hat SADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/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

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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