CVE-2025-68342

Kernel data disclosure and crash via short URBs

Published Dec 23, 2025 · Updated Dec 23, 2025

Out-of-bounds read in the Linux kernel gs_usb driver allows local users to disclose kernel data or crash the system via short USB frames. gs_usb_receive_bulk_callback derives the expected payload length from frame flags and enabled features, then accesses and copies bytes without first ensuring urb->actual_length contains them. Reachability requires the gs_usb receive path and a connected or emulated USB/CAN device capable of returning a truncated transfer; no data modification is reported.

CVSS severity6.9
Medium
EPSS probability0.18%
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 read in the Linux kernel gs_usb driver allows local users to disclose kernel data or crash the system via short USB frames. gs_usb_receive_bulk_callback derives the expected payload length from frame flags and enabled features, then accesses and copies bytes without first ensuring urb->actual_length contains them. Reachability requires the gs_usb receive path and a connected or emulated USB/CAN device capable of returning a truncated transfer; no data modification is reported.

The record

CVE
CVE-2025-68342
Published
Dec 23, 2025
Updated
Dec 23, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 23, 2025Record 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=3.16
  2. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <395d988f93861101ec89d0dd9e3b876ae9392a5b
  3. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <4ffac725154cf6a253f5e6aa0c8946232b6a0af5
  4. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <ad55004a3cb5b41ef78aa6c09e7bc5a489ba652b
  5. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <fb0c7c77a7ae3a2c3404b7d0173b8739a754b513

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.16; version=d08e973a77d128b25e01a08c34d89593fdf222da <395d988f93861101ec89d0dd9e3b876ae9392a5b; version=d08e973a77d128b25e01a08c34d89593fdf222da <4ffac725154cf6a253f5e6aa0c8946232b6a0af5; version=d08e973a77d128b25e01a08c34d89593fdf222da <ad55004a3cb5b41ef78aa6c09e7bc5a489ba652b; version=d08e973a77d128b25e01a08c34d89593fdf222da <fb0c7c77a7ae3a2c3404b7d0173b8739a754b513

Published CVSS scores

6.9SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
6.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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