CVE-2026-80737
Received Received - Intake

Synchronize DMA Teardown in Linux Kernel Serial Driver

Publication date: 2026-09-03

Last updated on: 2026-09-03

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.

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Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-03
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
CVE-2026-80737
EUVD
EUVD-2026-70341

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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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.

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.

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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