CVE-2026-90254Hinoki check available

Memory leakage via advertising-timeout cleanup omissions

Published Sep 17, 2026 · Updated Sep 17, 2026

Memory leakage in Linux Bluetooth hci_sync allows local users to consume kernel memory via failed or canceled advertising-timeout work. adv_timeout_expire() queues an allocated instance byte without a destroy callback and ignores queue failure, leaving the allocation unreleased on failure or cancellation. Exposure requires Bluetooth advertising activity and queue failure or cancellation, including controller unregistration; a deterministic crash or hang is not documented.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Memory leakage in Linux Bluetooth hci_sync allows local users to consume kernel memory via failed or canceled advertising-timeout work. adv_timeout_expire() queues an allocated instance byte without a destroy callback and ignores queue failure, leaving the allocation unreleased on failure or cancellation. Exposure requires Bluetooth advertising activity and queue failure or cancellation, including controller unregistration; a deterministic crash or hang is not documented.

The record

CVE
CVE-2026-90254
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772, T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <120d8dc042e3d45073bb6e50ee7b058a0b182627
  3. Affected versionversion=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <193182c6467f508a8a61d5db506d796ffed6eee6
  4. Affected versionversion=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <2e3d827cd56865c14f6ca118bbccd7801091fb21
  5. Affected versionversion=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <9c3b6c1413bd0b4993642d987616331f84d9b7f5
  6. Affected versionversion=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <bb5ca1cc7744c41c59002bd6523714a685ae6595
  7. Affected versionversion=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <c2019224a766245b7db39d87fdfe84c3fdc879d9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1; version=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <120d8dc042e3d45073bb6e50ee7b058a0b182627; version=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <193182c6467f508a8a61d5db506d796ffed6eee6; version=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <2e3d827cd56865c14f6ca118bbccd7801091fb21; version=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <9c3b6c1413bd0b4993642d987616331f84d9b7f5; version=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <bb5ca1cc7744c41c59002bd6523714a685ae6595; version=c249ea9b4309cf3250c5bbb42a05d38d0ed9071c <c2019224a766245b7db39d87fdfe84c3fdc879d9

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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

CWE-772Missing Release of Resource after Effective Lifetime
T1499.001OS Exhaustion Flood

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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