CVE-2026-90090

Memory disclosure via unpadded SDIO transmit buffers

Published Sep 17, 2026 · Updated Sep 17, 2026

Out-of-bounds reads in Linux's btmtksdio driver allow attackers to expose kernel memory to the Bluetooth device via SDIO transfers. The btmtksdio_tx_packet() function rounds the DMA transfer length to 256-byte blocks without extending and initializing the packet buffer, exposing up to 255 bytes beyond the packet data. Exposure requires transmission through the affected SDIO Bluetooth driver; disclosure to a remote Bluetooth peer is not established.

CVSS severity3.3
Low
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds reads in Linux's btmtksdio driver allow attackers to expose kernel memory to the Bluetooth device via SDIO transfers. The btmtksdio_tx_packet() function rounds the DMA transfer length to 256-byte blocks without extending and initializing the packet buffer, exposing up to 255 bytes beyond the packet data. Exposure requires transmission through the affected SDIO Bluetooth driver; disclosure to a remote Bluetooth peer is not established.

The record

CVE
CVE-2026-90090
Published
Sep 17, 2026
Updated
Sep 17, 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 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=5.2
  2. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <0b71a6caaf284915c8cf9cd320ecee9f0361824a
  3. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <7b37556d7d801b79096c7ba8ea92db2338aa8b00
  4. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <7b80d2701a68456c536f82e577dbed2f60ccb82b
  5. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <9a785ea864214aaffd8300683825c3f788d0b634
  6. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <c8742f53c9ef623decd5285403df0e5b5273c9fd
  7. Affected versionversion=9aebfd4a2200ab8075e44379c758bccefdc589bb <fa0ad2d277c7adead61d1c22411c55cea6990c2a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.2; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <0b71a6caaf284915c8cf9cd320ecee9f0361824a; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <7b37556d7d801b79096c7ba8ea92db2338aa8b00; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <7b80d2701a68456c536f82e577dbed2f60ccb82b; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <9a785ea864214aaffd8300683825c3f788d0b634; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <c8742f53c9ef623decd5285403df0e5b5273c9fd; version=9aebfd4a2200ab8075e44379c758bccefdc589bb <fa0ad2d277c7adead61d1c22411c55cea6990c2a

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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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