CVE-2026-23058

Memory exhaustion via unanchored receive URBs

Published Feb 4, 2026 · Updated Feb 4, 2026

Resource leak in the EMS USB CAN driver in the Linux Kernel allows attackers to exhaust memory through completed USB receive transfers. The USB framework unanchors each receive URB before ems_usb_read_bulk_callback resubmits it, leaving ems_usb_close unable to release completed URBs. Reachability requires the ems_usb driver to process USB-in completions; the published record does not identify who can generate enough completions to interrupt service.

CVSS severityUnavailable
Unscored
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

Resource leak in the EMS USB CAN driver in the Linux Kernel allows attackers to exhaust memory through completed USB receive transfers. The USB framework unanchors each receive URB before ems_usb_read_bulk_callback resubmits it, leaving ems_usb_close unable to release completed URBs. Reachability requires the ems_usb driver to process USB-in completions; the published record does not identify who can generate enough completions to interrupt service.

The record

CVE
CVE-2026-23058
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 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=2.6.32
  2. Affected versionversion=702171adeed3607ee9603ec30ce081411e36ae42 <0ce73a0eb5a27070957b67fd74059b6da89cc516
  3. Affected versionversion=702171adeed3607ee9603ec30ce081411e36ae42 <46a191ff7eeec33a2ccb2a1bfea34e18fbc5dc1a
  4. Affected versionversion=702171adeed3607ee9603ec30ce081411e36ae42 <68c62b3e53901846b5f68c5a8bade72a5d9c0b87
  5. Affected versionversion=702171adeed3607ee9603ec30ce081411e36ae42 <e9410fdd4d5f7eaa6526d8c80e83029d7c86a8e8

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.32; version=702171adeed3607ee9603ec30ce081411e36ae42 <0ce73a0eb5a27070957b67fd74059b6da89cc516; version=702171adeed3607ee9603ec30ce081411e36ae42 <46a191ff7eeec33a2ccb2a1bfea34e18fbc5dc1a; version=702171adeed3607ee9603ec30ce081411e36ae42 <68c62b3e53901846b5f68c5a8bade72a5d9c0b87; version=702171adeed3607ee9603ec30ce081411e36ae42 <e9410fdd4d5f7eaa6526d8c80e83029d7c86a8e8

Published CVSS scores

No CVSS assessment is available in this record.

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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