CVE-2026-90255

Memory leak and use-after-free via SCO cancellation

Published Sep 17, 2026 · Updated Sep 18, 2026

Memory-management errors in Linux kernel Bluetooth allow attackers to leak memory or access freed connection state during SCO setup. hci_setup_sync() queues conn_handle_t without a destroy callback and retains a bare hci_conn pointer, so cancellation leaks the wrapper while queued work can outlive the connection. The trigger requires pending SCO setup work to be canceled, including when a Bluetooth controller is unregistered; no further security consequence has been published.

CVSS severity2.5
Low
EPSS probability0.34%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-management errors in Linux kernel Bluetooth allow attackers to leak memory or access freed connection state during SCO setup. hci_setup_sync() queues conn_handle_t without a destroy callback and retains a bare hci_conn pointer, so cancellation leaks the wrapper while queued work can outlive the connection. The trigger requires pending SCO setup work to be canceled, including when a Bluetooth controller is unregistered; no further security consequence has been published.

The record

CVE
CVE-2026-90255
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=6.1
  2. Affected versionversion=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <37cfec41365c826d5496ef5d00c9e215eee53aa2
  3. Affected versionversion=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <42de40abe25db9211107af8896d0fd741f10648d
  4. Affected versionversion=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <4d7b1c834d2775b73c65e4888e01f5af8b477fe9
  5. Affected versionversion=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <9a2ba69cebe3fc5a3d4fa8eaaad3c42862723c27
  6. Affected versionversion=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <a661de0ee29d0915c5e924edf91d2be2b4d35bae
  7. Affected versionversion=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <c1fe3c74a89a7749cba3caa0dd91236049c66116

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1; version=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <37cfec41365c826d5496ef5d00c9e215eee53aa2; version=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <42de40abe25db9211107af8896d0fd741f10648d; version=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <4d7b1c834d2775b73c65e4888e01f5af8b477fe9; version=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <9a2ba69cebe3fc5a3d4fa8eaaad3c42862723c27; version=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <a661de0ee29d0915c5e924edf91d2be2b4d35bae; version=e07a06b4eb417f5271d33ce2240e93c62d98b7b4 <c1fe3c74a89a7749cba3caa0dd91236049c66116

Published CVSS scores

2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

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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