CVE-2026-68389

Adjacent kernel memory corruption via stale memdump pointer

Published Aug 10, 2026 · Updated Aug 10, 2026

Use-after-free in the Linux kernel hci_qca Bluetooth driver allows adjacent attackers to corrupt kernel memory via crafted HCI events. On a sequence-zero memdump packet advertising a zero size, qca_controller_memdump() frees qca->qca_memdump but leaves the saved pointer and collection state intact, so later work dereferences freed memory. An attacker controlling the controller-to-host HCI stream after a firmware crash can disclose or overwrite kernel memory, hijack control flow, or persistently wedge Bluetooth handling without host credentials or user interaction.

CVSS severity8.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel hci_qca Bluetooth driver allows adjacent attackers to corrupt kernel memory via crafted HCI events. On a sequence-zero memdump packet advertising a zero size, qca_controller_memdump() frees qca->qca_memdump but leaves the saved pointer and collection state intact, so later work dereferences freed memory. An attacker controlling the controller-to-host HCI stream after a firmware crash can disclose or overwrite kernel memory, hijack control flow, or persistently wedge Bluetooth handling without host credentials or user interaction.

The record

CVE
CVE-2026-68389
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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?

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

  1. Affected versionversion=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <069258d5111eed9ac9586bee42d03d38e2975715
  2. Affected versionversion=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <2363a757694752426fc47f3eadde15cf5f791fa5
  3. Affected versionversion=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <5a3945e8dea6c9a8ec9e981169ac9487e1d6ad6a
  4. Affected versionversion=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <bf587a10c33e5571a299742e45bc18960b9912e7
  5. Affected versionversion=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <cefb44c367b2b52e50f97bc8526d39df9bcf5e60
  6. Affected versionversion=6.6

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <069258d5111eed9ac9586bee42d03d38e2975715; version=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <2363a757694752426fc47f3eadde15cf5f791fa5; version=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <5a3945e8dea6c9a8ec9e981169ac9487e1d6ad6a; version=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <bf587a10c33e5571a299742e45bc18960b9912e7; version=06d3fdfcdf5cefb06f2024b9d3dad356779399cf <cefb44c367b2b52e50f97bc8526d39df9bcf5e60; version=6.6

Published CVSS scores

8.8Linux CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS: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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1203Exploitation for Client Execution

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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