Description
In the Linux kernel, the following vulnerability has been resolved:

amt: fix use-after-free in AMT delayed works

When an AMT device is removed, pending delayed works can still access
the freed amt_dev structure, which may result in kernel crashes or
memory corruption.

amt_dev_stop() cancels req_wq and discovery_wq with
cancel_delayed_work_sync(), but these works can be scheduled again
from event_wq after the cancellation. This allows delayed works to
access the freed amt_dev structure after the netdev has been released.

The following is a simple race scenario:

CPU0 CPU1

amt_dev_stop()
cancel_delayed_work_sync()
amt_event_work()
mod_delayed_work(req_wq)
free netdev
req_wq accesses freed amt_dev

Use disable_delayed_work_sync() in amt_dev_stop() to prevent req_wq and
discovery_wq from being queued again and wait for running work items
to complete.

The delayed works are disabled after initialization in
amt_newlink() and enabled only when the device is successfully opened.
This keeps the delayed work lifecycle synchronized with the lifetime
of the AMT device.
Published: 2026-08-10
Score: n/a
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A use‑after‑free flaw in the AMT subsystem of the Linux kernel allows pending delayed work items to run against a freed device structure after the AMT device has been removed. This bug can cause a kernel crash or corrupt memory. The primary impact is disruption of kernel operation and, depending on the context, could be leveraged to gain elevated privileges if an attacker can trigger the race condition.

Affected Systems

Any Linux kernel that includes AMT support is affected. The exact kernel versions are not specified, so all builds with the AMT driver should be considered vulnerable until the patch is applied.

Risk and Exploitability

No EPSS score is available and the vulnerability is not listed in CISA KEV, indicating that public knowledge of exploitation is limited. The flaw requires a local or privileged attacker to cause the device removal race. However, a kernel crash constitutes a serious denial‑of‑service event, and memory corruption could enable further attacks if the attacker can influence the freed memory region.

Generated by OpenCVE AI on August 10, 2026 at 14:02 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the latest Linux kernel update that incorporates the fix for AMT use‑after‑free
  • Configure the kernel to disable AMT support (e.g., set CONFIG_AMT to n) if the feature is unnecessary
  • If immediate patching is not possible, avoid removing or disconnecting AMT devices while the system is in use and consider keeping AMT devices disabled or offline during vulnerable periods

Generated by OpenCVE AI on August 10, 2026 at 14:02 UTC.

Tracking

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Advisories

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History

Mon, 10 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416

Mon, 10 Aug 2026 12:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: amt: fix use-after-free in AMT delayed works When an AMT device is removed, pending delayed works can still access the freed amt_dev structure, which may result in kernel crashes or memory corruption. amt_dev_stop() cancels req_wq and discovery_wq with cancel_delayed_work_sync(), but these works can be scheduled again from event_wq after the cancellation. This allows delayed works to access the freed amt_dev structure after the netdev has been released. The following is a simple race scenario: CPU0 CPU1 amt_dev_stop() cancel_delayed_work_sync() amt_event_work() mod_delayed_work(req_wq) free netdev req_wq accesses freed amt_dev Use disable_delayed_work_sync() in amt_dev_stop() to prevent req_wq and discovery_wq from being queued again and wait for running work items to complete. The delayed works are disabled after initialization in amt_newlink() and enabled only when the device is successfully opened. This keeps the delayed work lifecycle synchronized with the lifetime of the AMT device.
Title amt: fix use-after-free in AMT delayed works
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-10T11:59:18.270Z

Reserved: 2026-07-30T09:28:09.371Z

Link: CVE-2026-68152

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-10T14:15:03Z

Weaknesses