CVE-2026-23037

Kernel memory leak via partial URB allocation

Published Jan 31, 2026 · Updated Jan 31, 2026

Resource leak in the Linux kernel ETAS ES58x CAN USB driver allows attackers to retain anchored receive URBs during device open. During es58x_open(), es58x_alloc_rx_urbs() returns an error after allocating some URBs, so the early return bypasses free_urbs and leaves them anchored. Triggering the leak requires the driver to open while receive-URB allocation only partially succeeds; repeated exposure consumes kernel memory.

CVSS severityUnavailable
Unscored
EPSS probability0.22%
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 Linux kernel ETAS ES58x CAN USB driver allows attackers to retain anchored receive URBs during device open. During es58x_open(), es58x_alloc_rx_urbs() returns an error after allocating some URBs, so the early return bypasses free_urbs and leaves them anchored. Triggering the leak requires the driver to open while receive-URB allocation only partially succeeds; repeated exposure consumes kernel memory.

The record

CVE
CVE-2026-23037
Published
Jan 31, 2026
Updated
Jan 31, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

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=5.13
  2. Affected versionversion=8537257874e949a59c834cecfd5a063e11b64b0b <611e839d2d552416b498ed5593e10670f61fcd4d
  3. Affected versionversion=8537257874e949a59c834cecfd5a063e11b64b0b <6c5124a60989051799037834f0a1a4b428718157
  4. Affected versionversion=8537257874e949a59c834cecfd5a063e11b64b0b <b1979778e98569c1e78c2c7f16bb24d76541ab00
  5. Affected versionversion=8537257874e949a59c834cecfd5a063e11b64b0b <ba45e3d6b02c97dbb4578fbae7027fd66f3caa10

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.13; version=8537257874e949a59c834cecfd5a063e11b64b0b <611e839d2d552416b498ed5593e10670f61fcd4d; version=8537257874e949a59c834cecfd5a063e11b64b0b <6c5124a60989051799037834f0a1a4b428718157; version=8537257874e949a59c834cecfd5a063e11b64b0b <b1979778e98569c1e78c2c7f16bb24d76541ab00; version=8537257874e949a59c834cecfd5a063e11b64b0b <ba45e3d6b02c97dbb4578fbae7027fd66f3caa10

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.

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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)
VectorUnavailable
PrivilegesUnavailable
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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