CVE-2026-43023

Kernel memory corruption via concurrent SCO connects

Published May 1, 2026 · Updated May 1, 2026

Race condition in Linux Kernel 6.3 and affected later branches allows local users to corrupt kernel memory through concurrent SCO connects. The sco_sock_connect() path reads sk_state and sk_type before taking the socket lock, so simultaneous connect() calls can attach a socket twice while an HCI disconnect closes it. Low-privilege local access and precise concurrency with a disconnect are required; later cleanup performs a double sock_put(), causing use-after-free and leaking the orphaned connection.

CVSS severity7.8
High
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel 6.3 and affected later branches allows local users to corrupt kernel memory through concurrent SCO connects. The sco_sock_connect() path reads sk_state and sk_type before taking the socket lock, so simultaneous connect() calls can attach a socket twice while an HCI disconnect closes it. Low-privilege local access and precise concurrency with a disconnect are required; later cleanup performs a double sock_put(), causing use-after-free and leaking the orphaned connection.

The record

CVE
CVE-2026-43023
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=6.3
  2. Affected versionversion=70a13b1e25fef37c87c8a1228ddb8900efbca7cf <dabf22269242e2f2bf44c43fcdc2fa763df7f9cc
  3. Affected versionversion=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <7e296ffdab5bdab718dff7c14288fdcb9154fa27
  4. Affected versionversion=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <8a5b0135d4a5d9683203a3d9a12a711ccec5936b
  5. Affected versionversion=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <98c8d3bfdaa657d8f472dbbebd7ea8cd816d8a8d
  6. Affected versionversion=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <adb90cd0f9f7a8d438fcb93354040fbafc5ae2a0
  7. Affected versionversion=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <d002bd11024bd231bcb606877e33951ffb7bed14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.3; version=70a13b1e25fef37c87c8a1228ddb8900efbca7cf <dabf22269242e2f2bf44c43fcdc2fa763df7f9cc; version=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <7e296ffdab5bdab718dff7c14288fdcb9154fa27; version=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <8a5b0135d4a5d9683203a3d9a12a711ccec5936b; version=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <98c8d3bfdaa657d8f472dbbebd7ea8cd816d8a8d; version=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <adb90cd0f9f7a8d438fcb93354040fbafc5ae2a0; version=9a8ec9e8ebb5a7c0cfbce2d6b4a6b67b2b78e8f3 <d002bd11024bd231bcb606877e33951ffb7bed14

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1068Exploitation for Privilege Escalation

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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