CVE-2026-90088Hinoki check available

Memory exhaustion via zero-MTU Bluetooth negotiation

Published Sep 17, 2026 · Updated Sep 17, 2026

Denial of service in Linux Bluetooth RFCOMM allows physically proximate attackers to exhaust memory via zero-MTU negotiation. The rfcomm_apply_pn() function accepts a zero MTU from a peer's Parameter Negotiation frame, causing sendmsg fragmentation to loop indefinitely while allocating zero-length socket buffers. Exploitation requires reachable Bluetooth RFCOMM negotiation and subsequent data transmission; the disclosed consequence is a send-path hang and system-memory exhaustion, not data access.

CVSS severity6.5
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

Denial of service in Linux Bluetooth RFCOMM allows physically proximate attackers to exhaust memory via zero-MTU negotiation. The rfcomm_apply_pn() function accepts a zero MTU from a peer's Parameter Negotiation frame, causing sendmsg fragmentation to loop indefinitely while allocating zero-length socket buffers. Exploitation requires reachable Bluetooth RFCOMM negotiation and subsequent data transmission; the disclosed consequence is a send-path hang and system-memory exhaustion, not data access.

The record

CVE
CVE-2026-90088
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

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

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Is a vulnerable build present?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3988cbb1be501dbff909a2ee024670e3c955a66d
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <44c98fd082eafd49d55a8a4077ff488175b2fe24
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9b2e5f1928c99224345a9ed8c5dae5fc74964d6d
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aeee917a4878af95f0c63e18c5f22eaf6299c7b8
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cbc2962da99b6b89345267d3aa74b4b573340548
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7c0aa45ae6c5a338661b23812bfcdef50bf3e96
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f561e44261344adadf9d6a6dff31e3af9776d5c6
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc4851ff8dfb505e9a19efcc286712132bbd178d
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3988cbb1be501dbff909a2ee024670e3c955a66d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <44c98fd082eafd49d55a8a4077ff488175b2fe24; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9b2e5f1928c99224345a9ed8c5dae5fc74964d6d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aeee917a4878af95f0c63e18c5f22eaf6299c7b8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cbc2962da99b6b89345267d3aa74b4b573340548; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e7c0aa45ae6c5a338661b23812bfcdef50bf3e96; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f561e44261344adadf9d6a6dff31e3af9776d5c6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc4851ff8dfb505e9a19efcc286712132bbd178d; version=2.6.12

Published CVSS scores

6.5Amazon LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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No observations available

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

Weakness, pattern, technique

T1499.004Exploitation for Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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