CVE-2026-74459

Service interruption via failed RX URB cleanup

Published Aug 15, 2026 · Updated Aug 15, 2026

Resource leak in the etas_es58x CAN USB driver in affected Linux kernel versions allows local users to exhaust memory and interrupt service. On RX URB resubmission failure, es58x_read_bulk_callback() unanchors the URB and returns without freeing its usb_alloc_coherent() transfer buffer. Triggering the leak requires an attached ETAS ES58X USB CAN adapter and a failed RX URB resubmission; repeated failures progressively consume memory.

CVSS severity5.5
Medium
EPSS probability0.17%
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 etas_es58x CAN USB driver in affected Linux kernel versions allows local users to exhaust memory and interrupt service. On RX URB resubmission failure, es58x_read_bulk_callback() unanchors the URB and returns without freeing its usb_alloc_coherent() transfer buffer. Triggering the leak requires an attached ETAS ES58X USB CAN adapter and a failed RX URB resubmission; repeated failures progressively consume memory.

The record

CVE
CVE-2026-74459
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=18eee279e9b5bff0db1aca9475ae4bc12804f05c <c311f17c261fd375ddf5755f2ebe1f022c19c5b0
  2. Affected versionversion=2185ea6e4ebcb61d1224dc7d187c59723cb5ad59
  3. Affected versionversion=5.15.203 <5.16
  4. Affected versionversion=5eaad4f768266f1f17e01232ffe2ef009f8129b7 <19c6c8c6cd5dd14fab5fcd744584812a57cbb78d
  5. Affected versionversion=5eaad4f768266f1f17e01232ffe2ef009f8129b7 <7a0cf2b2497c757c3cb1286eddf2986abb0d387b
  6. Affected versionversion=6.1.167 <6.2
  7. Affected versionversion=6.12.77 <6.12.103
  8. Affected versionversion=6.18.17 <6.18.44
  9. Affected versionversion=6.19.7 <6.20
  10. Affected versionversion=6.6.130 <6.6.151
  11. Affected versionversion=7.0
  12. Affected versionversion=7a0171b4921ad443fee5ed4fcb9d99fa4776edac
  13. Affected versionversion=b878444519fa03a3edd287d1963cf79ef78be2f1 <b85e5c310382803d27adf6fe6554d4208bc8951c
  14. Affected versionversion=b8f9ca88253574638bcff38900a4c28d570b1919
  15. Affected versionversion=f6e90c113c92e83fc0963d5e60e16b0e8a268981 <0ef136ba052101243ba117a1aca6f4a4c3a81142

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=18eee279e9b5bff0db1aca9475ae4bc12804f05c <c311f17c261fd375ddf5755f2ebe1f022c19c5b0; version=2185ea6e4ebcb61d1224dc7d187c59723cb5ad59; version=5.15.203 <5.16; version=5eaad4f768266f1f17e01232ffe2ef009f8129b7 <19c6c8c6cd5dd14fab5fcd744584812a57cbb78d; version=5eaad4f768266f1f17e01232ffe2ef009f8129b7 <7a0cf2b2497c757c3cb1286eddf2986abb0d387b; version=6.1.167 <6.2; version=6.12.77 <6.12.103; version=6.18.17 <6.18.44; version=6.19.7 <6.20; version=6.6.130 <6.6.151; version=7.0; version=7a0171b4921ad443fee5ed4fcb9d99fa4776edac; version=b878444519fa03a3edd287d1963cf79ef78be2f1 <b85e5c310382803d27adf6fe6554d4208bc8951c; version=b8f9ca88253574638bcff38900a4c28d570b1919; version=f6e90c113c92e83fc0963d5e60e16b0e8a268981 <0ef136ba052101243ba117a1aca6f4a4c3a81142

Published CVSS scores

5.5Red HatCVSS: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 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

CWE-772Missing Release of Resource after Effective Lifetime
T1499.004Application or System Exploitation

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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