CVE-2026-23461Public exploit

Adjacent kernel memory corruption via L2CAP locking race

Published Apr 3, 2026 · Updated Apr 3, 2026

Use-after-free in Linux Kernel Bluetooth L2CAP allows physically proximate attackers to corrupt kernel memory during connection teardown. l2cap_register_user() and l2cap_unregister_user() access conn->users and conn->hchan without conn->lock while l2cap_conn_del() tears down the same structure. Bluetooth L2CAP reachability and concurrent connection teardown are required; the documented outcomes are list corruption and access to freed connection state.

CVSS severity8.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel Bluetooth L2CAP allows physically proximate attackers to corrupt kernel memory during connection teardown. l2cap_register_user() and l2cap_unregister_user() access conn->users and conn->hchan without conn->lock while l2cap_conn_del() tears down the same structure. Bluetooth L2CAP reachability and concurrent connection teardown are required; the documented outcomes are list corruption and access to freed connection state.

The record

CVE
CVE-2026-23461
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499
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=18ab6b6078fa8191ca30a3065d57bf35d5635761
  2. Affected versionversion=6.14
  3. Affected versionversion=ab4eedb790cae44313759b50fe47da285e2519d5 <71030f3b3015a412133a805ff47970cdcf30c2b8
  4. Affected versionversion=ab4eedb790cae44313759b50fe47da285e2519d5 <752a6c9596dd25efd6978a73ff21f3b592668f4a
  5. Affected versionversion=ab4eedb790cae44313759b50fe47da285e2519d5 <da3000cbe4851458a22be38bb18c0689c39fdd5f
  6. Affected versionversion=efc30877bd4bc85fefe98d80af60fafc86e5775e <11a87dd5df428a4b79a84d2790cac7f3c73f1f0d
  7. Affected versionversion=f87271d21dd4ee83857ca11b94e7b4952749bbae <c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=18ab6b6078fa8191ca30a3065d57bf35d5635761; version=6.14; version=ab4eedb790cae44313759b50fe47da285e2519d5 <71030f3b3015a412133a805ff47970cdcf30c2b8; version=ab4eedb790cae44313759b50fe47da285e2519d5 <752a6c9596dd25efd6978a73ff21f3b592668f4a; version=ab4eedb790cae44313759b50fe47da285e2519d5 <da3000cbe4851458a22be38bb18c0689c39fdd5f; version=efc30877bd4bc85fefe98d80af60fafc86e5775e <11a87dd5df428a4b79a84d2790cac7f3c73f1f0d; version=f87271d21dd4ee83857ca11b94e7b4952749bbae <c22a5e659959eb77c2fbb58a5adfaf3c3dab7abf

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

Public exploit references

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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