CVE-2026-23031

Local denial of service via leaked URBs

Published Jan 31, 2026 · Updated Jan 31, 2026

Memory leak in the gs_usb CAN driver in affected Linux Kernel versions allows local users to exhaust kernel memory through interface cycling. The gs_usb_receive_bulk_callback function resubmits a completed receive URB after USB has removed it from rx_submitted, so gs_can_close cannot release it. A compatible gs_usb CAN adapter and permission to cycle its network interface are required; the reported consequence is a local service interrupt.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the gs_usb CAN driver in affected Linux Kernel versions allows local users to exhaust kernel memory through interface cycling. The gs_usb_receive_bulk_callback function resubmits a completed receive URB after USB has removed it from rx_submitted, so gs_can_close cannot release it. A compatible gs_usb CAN adapter and permission to cycle its network interface are required; the reported consequence is a local service interrupt.

The record

CVE
CVE-2026-23031
Published
Jan 31, 2026
Updated
Jan 31, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 31, 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=3.16
  2. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <08624b7206ddb9148eeffc2384ebda2c47b6d1e9
  3. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <7352e1d5932a0e777e39fa4b619801191f57e603
  4. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <9f669a38ca70839229b7ba0f851820850a2fe1f7
  5. Affected versionversion=d08e973a77d128b25e01a08c34d89593fdf222da <f905bcfa971edb89e398c98957838d8c6381c0c7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.16; version=d08e973a77d128b25e01a08c34d89593fdf222da <08624b7206ddb9148eeffc2384ebda2c47b6d1e9; version=d08e973a77d128b25e01a08c34d89593fdf222da <7352e1d5932a0e777e39fa4b619801191f57e603; version=d08e973a77d128b25e01a08c34d89593fdf222da <9f669a38ca70839229b7ba0f851820850a2fe1f7; version=d08e973a77d128b25e01a08c34d89593fdf222da <f905bcfa971edb89e398c98957838d8c6381c0c7

Published CVSS scores

5.5OracleCVSS: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

T1499.001Endpoint Denial of Service: OS Exhaustion Flood

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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