CVE-2026-23462

Kernel memory corruption via stale L2CAP reference

Published Apr 3, 2026 · Updated Apr 3, 2026

A use-after-free in Linux kernel Bluetooth HIDP allows physically proximate attackers to corrupt kernel memory during session teardown. hidp_session_remove leaves session->conn usable after L2CAP invokes the user removal callback, so hidp_session_thread later unregisters through a freed connection object. A malicious paired or auto-reconnected Bluetooth HID peer needs no target-system privileges; the demonstrated consequence is a kernel crash.

CVSS severity8.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in Linux kernel Bluetooth HIDP allows physically proximate attackers to corrupt kernel memory during session teardown. hidp_session_remove leaves session->conn usable after L2CAP invokes the user removal callback, so hidp_session_thread later unregisters through a freed connection object. A malicious paired or auto-reconnected Bluetooth HID peer needs no target-system privileges; the demonstrated consequence is a kernel crash.

The record

CVE
CVE-2026-23462
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 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=3.10
  2. Affected versionversion=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <21a47a119f33df9bb157326846390d7e8e1b45ba
  3. Affected versionversion=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <45ebe5b900200ac3e01f3470506a44a447825721
  4. Affected versionversion=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <4d37fa7582aa960ba23e10a7a2596a29f37ad281
  5. Affected versionversion=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <7c805b7d1e580eececcc92470292e3dbc42bc3f5
  6. Affected versionversion=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <dbf666e4fc9bdd975a61bf682b3f75cb0145eedd
  7. Affected versionversion=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <f8b6ed2f06d3baa44f347a0fa2af52433f386463

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.10; version=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <21a47a119f33df9bb157326846390d7e8e1b45ba; version=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <45ebe5b900200ac3e01f3470506a44a447825721; version=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <4d37fa7582aa960ba23e10a7a2596a29f37ad281; version=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <7c805b7d1e580eececcc92470292e3dbc42bc3f5; version=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <dbf666e4fc9bdd975a61bf682b3f75cb0145eedd; version=b4f34d8d9d26b2428fa7cf7c8f97690a297978e6 <f8b6ed2f06d3baa44f347a0fa2af52433f386463

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.8Linux kernel CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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