CVE-2026-90092

Kernel use-after-free via L2CAP listener race

Published Sep 17, 2026 · Updated Sep 18, 2026

Use-after-free in Linux Bluetooth L2CAP in affected kernel branches allows local users to trigger unsafe access to freed kernel memory. The l2cap_sock_new_connection_cb function can enqueue a new socket after l2cap_sock_teardown_cb closes and destroys the listening parent because channel state is read without consistent locking. Concurrent listener teardown and L2CAP connection creation are required; the published record does not specify whether the dangling parent access causes a crash, data exposure, or code execution.

CVSS severity7.0
High
EPSS probability0.35%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Bluetooth L2CAP in affected kernel branches allows local users to trigger unsafe access to freed kernel memory. The l2cap_sock_new_connection_cb function can enqueue a new socket after l2cap_sock_teardown_cb closes and destroys the listening parent because channel state is read without consistent locking. Concurrent listener teardown and L2CAP connection creation are required; the published record does not specify whether the dangling parent access causes a crash, data exposure, or code execution.

The record

CVE
CVE-2026-90092
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0c17c8832562b2aac288e89cefd0f46074f54bcb <bf61a65c6093970e3b50031c4b79ebf3bd411eba
  2. Affected versionversion=1810e42ff6716f320c7269d5850eca48b07b7427 <87276dc15b559d32757a43b4415c8445fbae06c4
  3. Affected versionversion=1b1c0da227bf63479bac9982fc8d12df9aaea0fb
  4. Affected versionversion=2ff1a41a912de8517b4482e946dd951b7d80edbf <c47339e169bf4a0a4cfabb91351471f67744c2bc
  5. Affected versionversion=2ff1a41a912de8517b4482e946dd951b7d80edbf <d4bfa78fd67929b62b02013c107973e0c5b7aa9a
  6. Affected versionversion=5.10.258 <5.11
  7. Affected versionversion=5105f3e6b2df619c635b5f6a49fac131a36c7952 <491e4c60017969b053888029998d2a61f298986a
  8. Affected versionversion=5.15.209 <5.16
  9. Affected versionversion=6.1.175 <6.1.188
  10. Affected versionversion=6.12.88 <6.12.110
  11. Affected versionversion=6.18.30 <6.18.52
  12. Affected versionversion=6.6.140 <6.6.157
  13. Affected versionversion=7.0.7 <7.1
  14. Affected versionversion=7.1
  15. Affected versionversion=85426e97dc72f2088ba6d27e74cd58c3fbd43e31
  16. Affected versionversion=a2dcf1a61d056aef15b63c6eae9441344d624389
  17. Affected versionversion=c88c185ae0a1067823661b220aeea613df2c127b <2a3a27aaf19bf069720e024ce6fde54e6bf80df9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0c17c8832562b2aac288e89cefd0f46074f54bcb <bf61a65c6093970e3b50031c4b79ebf3bd411eba; version=1810e42ff6716f320c7269d5850eca48b07b7427 <87276dc15b559d32757a43b4415c8445fbae06c4; version=1b1c0da227bf63479bac9982fc8d12df9aaea0fb; version=2ff1a41a912de8517b4482e946dd951b7d80edbf <c47339e169bf4a0a4cfabb91351471f67744c2bc; version=2ff1a41a912de8517b4482e946dd951b7d80edbf <d4bfa78fd67929b62b02013c107973e0c5b7aa9a; version=5.10.258 <5.11; version=5105f3e6b2df619c635b5f6a49fac131a36c7952 <491e4c60017969b053888029998d2a61f298986a; version=5.15.209 <5.16; version=6.1.175 <6.1.188; version=6.12.88 <6.12.110; version=6.18.30 <6.18.52; version=6.6.140 <6.6.157; version=7.0.7 <7.1; version=7.1; version=85426e97dc72f2088ba6d27e74cd58c3fbd43e31; version=a2dcf1a61d056aef15b63c6eae9441344d624389; version=c88c185ae0a1067823661b220aeea613df2c127b <2a3a27aaf19bf069720e024ce6fde54e6bf80df9

Published CVSS scores

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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