CVE-2026-72037

System crash via uninitialized lan743x spinlock

Published Aug 15, 2026 · Updated Aug 15, 2026

Improper initialization in affected Linux kernel branches starting at 6.0 allows local users to crash systems during lan743x PCI device probing. The lan743x_hardware_init() path calls pci11x1x_strap_get_status(), which acquires adapter->eth_syslock_spinlock before that lock is initialized. The crash requires CONFIG_DEBUG_SPINLOCK and compatible PCI11x1x hardware, and it interrupts availability without reported data access or modification.

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

Improper initialization in affected Linux kernel branches starting at 6.0 allows local users to crash systems during lan743x PCI device probing. The lan743x_hardware_init() path calls pci11x1x_strap_get_status(), which acquires adapter->eth_syslock_spinlock before that lock is initialized. The crash requires CONFIG_DEBUG_SPINLOCK and compatible PCI11x1x hardware, and it interrupts availability without reported data access or modification.

The record

CVE
CVE-2026-72037
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499
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=46b777ad9a8c269113634cee6a380bc4e53f3964 <39139b1c1c2b614096519b526112c726adb12ff0
  2. Affected versionversion=46b777ad9a8c269113634cee6a380bc4e53f3964 <6523daa6852b1bfef32ec7a105b0217e8a115687
  3. Affected versionversion=46b777ad9a8c269113634cee6a380bc4e53f3964 <99a6f37b113c46815deb160c5012073563679ef4
  4. Affected versionversion=46b777ad9a8c269113634cee6a380bc4e53f3964 <b6a93a42e0e61f0ba0005a942ee3bffb16c0574e
  5. Affected versionversion=46b777ad9a8c269113634cee6a380bc4e53f3964 <b99e890e6b32ffa11c145a16fefcf2c7137a9578
  6. Affected versionversion=46b777ad9a8c269113634cee6a380bc4e53f3964 <dfaefd9a7808736fcd2ed0de108f55c4badc15cc
  7. Affected versionversion=6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=46b777ad9a8c269113634cee6a380bc4e53f3964 <39139b1c1c2b614096519b526112c726adb12ff0; version=46b777ad9a8c269113634cee6a380bc4e53f3964 <6523daa6852b1bfef32ec7a105b0217e8a115687; version=46b777ad9a8c269113634cee6a380bc4e53f3964 <99a6f37b113c46815deb160c5012073563679ef4; version=46b777ad9a8c269113634cee6a380bc4e53f3964 <b6a93a42e0e61f0ba0005a942ee3bffb16c0574e; version=46b777ad9a8c269113634cee6a380bc4e53f3964 <b99e890e6b32ffa11c145a16fefcf2c7137a9578; version=46b777ad9a8c269113634cee6a380bc4e53f3964 <dfaefd9a7808736fcd2ed0de108f55c4badc15cc; version=6.0

Published CVSS scores

2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
4.0SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.1SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
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

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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

CWE-908Use of Uninitialized Resource
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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