CVE-2026-80737

Received Received - Intake

Synchronize DMA Teardown in Linux Kernel Serial Driver

Publication date: 2026-09-03

Last updated on: 2026-09-04

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: serial: amba-pl011: synchronize DMA teardown dmaengine_terminate_all() does not wait for a running callback, so the TX callback can still touch the TX buffer after it is freed. The RX poll timer reads the RX buffers without the port lock. Switch to dmaengine_terminate_sync() and delete the RX timer before freeing the buffers.

CVSS Scores

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Meta Information

Published

2026-09-03

Last Modified

2026-09-04

Generated

2026-09-13

AI Q&A

2026-09-03

EPSS Evaluated

2026-09-12

NVD

CVE-2026-80737

EUVD

EUVD-2026-70341

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves improper synchronization during DMA (Direct Memory Access) teardown in the AMBA PL011 serial driver. The issue occurs because dmaengine_terminate_all() does not wait for a running callback, allowing the TX callback to access freed memory. Additionally, the RX poll timer reads RX buffers without proper locking.

Detection Guidance

This vulnerability is specific to the Linux kernel's serial driver (amba-pl011) and involves DMA teardown synchronization issues. Detection requires checking kernel versions and driver behavior rather than network scanning. Examine kernel logs for DMA-related errors or crashes during serial port operations. Check if your system uses the affected driver by inspecting loaded modules with 'lsmod | grep pl011' or 'dmesg | grep pl011'.

Impact Analysis

This vulnerability could lead to memory corruption, crashes, or unexpected behavior in systems using the affected Linux kernel serial driver. Attackers might exploit it to cause denial-of-service or execute arbitrary code with kernel privileges.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it pertains to a Linux kernel DMA synchronization issue without clear implications for data protection or privacy.

Mitigation Strategies

Update the Linux kernel to a patched version where dmaengine_terminate_sync() is used instead of dmaengine_terminate_all() and the RX timer is deleted before freeing buffers.

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