CVE-2026-80737 - Vulnerability Details

- serial: amba-pl011: synchronize DMA teardown

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.

Published: 2026-09-03

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

The AMBA PL011 serial driver in the Linux kernel has a flaw where dmaengine_terminate_all() does not wait for an active hardware callback, allowing the transmit callback to access a transmit buffer after it has been freed. The receive poll timer reads receive buffers without holding the port lock, creating a race condition. This improper synchronization results in a use‑after‑free in kernel space, enabling an attacker to trigger execution of arbitrary code or leak sensitive data by manipulating the driver’s DMA callbacks.

Affected Systems

All Linux kernel releases that include the AMBA PL011 serial driver are potentially impacted. No specific affected versions are listed in the advisory.

Risk and Exploitability

The risk is high because the flaw occurs in kernel space and can lead to privilege escalation. No EPSS score is available and the vulnerability is not currently listed in the CISA KEV catalog. The likely attack vector is a local attacker who can trigger DMA transfers on the affected serial device, or any process that can manipulate the driver via ioctl or sysfs interfaces.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`ead76f329f777c7301e0a5456a0a1c7a081570bd`	affected	< a38fae9d212e2d3ed5e9ec0ef773f8c0a27fb76e
`ead76f329f777c7301e0a5456a0a1c7a081570bd`	affected	< 44bd0ecc3444882d08ecfbc2b2418d2f463d3186
`ead76f329f777c7301e0a5456a0a1c7a081570bd`	affected	< f70c9d4fba46463a5b1c7b3ee9ee3b40c90dac03
`ead76f329f777c7301e0a5456a0a1c7a081570bd`	affected	< c8c8e895f65fbf71ea6224e27cf8dab91b776e0d
`ead76f329f777c7301e0a5456a0a1c7a081570bd`	affected	< 9f6989e477f03a4721d34bb4b09b17accd40283e
`ead76f329f777c7301e0a5456a0a1c7a081570bd`	affected	< 5974cb66681eac367107b05924744d7e3b49d41c
`ead76f329f777c7301e0a5456a0a1c7a081570bd`	affected	< fdfb46c387241b4eddd36d746793764413285913
`ead76f329f777c7301e0a5456a0a1c7a081570bd`	affected	< 440915499231e9db1c361aa45bb702e8fd3b4a32

Linux

affected

Version	Status	Constraints
`2.6.39`	affected	—
`0`	unaffected	< 2.6.39
`5.10.267`	unaffected	≤ 5.10.*
`5.15.218`	unaffected	≤ 5.15.*
`6.1.185`	unaffected	≤ 6.1.*
`6.6.154`	unaffected	≤ 6.6.*
`6.12.106`	unaffected	≤ 6.12.*
`6.18.45`	unaffected	≤ 6.18.*
`7.1.9`	unaffected	≤ 7.1.*
`7.2`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[ead76f329f777c7301e0a5456a0a1c7a081570bd,a38fae9d212e2d3ed5e9ec0ef773f8c0a27fb76e)`	affected	code_commit	—
`[ead76f329f777c7301e0a5456a0a1c7a081570bd,44bd0ecc3444882d08ecfbc2b2418d2f463d3186)`	affected	code_commit	—
`[ead76f329f777c7301e0a5456a0a1c7a081570bd,f70c9d4fba46463a5b1c7b3ee9ee3b40c90dac03)`	affected	code_commit	—
`[ead76f329f777c7301e0a5456a0a1c7a081570bd,c8c8e895f65fbf71ea6224e27cf8dab91b776e0d)`	affected	code_commit	—
`[ead76f329f777c7301e0a5456a0a1c7a081570bd,9f6989e477f03a4721d34bb4b09b17accd40283e)`	affected	code_commit	—
`[ead76f329f777c7301e0a5456a0a1c7a081570bd,5974cb66681eac367107b05924744d7e3b49d41c)`	affected	code_commit	—
`[ead76f329f777c7301e0a5456a0a1c7a081570bd,fdfb46c387241b4eddd36d746793764413285913)`	affected	code_commit	—
`[ead76f329f777c7301e0a5456a0a1c7a081570bd,440915499231e9db1c361aa45bb702e8fd3b4a32)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`2.6.39`	affected	semver	—
`[0,2.6.39)`	unaffected	semver	—
`[5.10.267,5.11.0)`	unaffected	semver	—
`[5.15.218,5.16.0)`	unaffected	semver	—
`[6.1.185,6.2.0)`	unaffected	semver	—
`[6.6.154,6.7.0)`	unaffected	semver	—
`[6.12.106,6.13.0)`	unaffected	semver	—
`[7.1.9,7.2.0)`	unaffected	semver	—
`[6.18.45,6.19.0)`	unaffected	generic	—
`[0,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Update the kernel to a version that includes the fix that changes dmaengine_terminate_all() to the synchronous variant and removes the RX timer before freeing buffers.
If an upgrade is not feasible, disable the AMBA PL011 serial driver or configure it to avoid using DMA transfers on the target device.
Ensure that any services or utilities that interact with the driver run with the minimum required privileges and that the device is not exposed to untrusted code.

Generated by OpenCVE AI on September 3, 2026 at 13:07 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0021.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/440915499231e9db1c361aa45bb702e8fd3b4a32
https://git.kernel.org/stable/c/44bd0ecc3444882d08ecfbc2b2418d2f463d3186
https://git.kernel.org/stable/c/5974cb66681eac367107b05924744d7e3b49d41c
https://git.kernel.org/stable/c/9f6989e477f03a4721d34bb4b09b17accd40283e
https://git.kernel.org/stable/c/a38fae9d212e2d3ed5e9ec0ef773f8c0a27fb76e
https://git.kernel.org/stable/c/c8c8e895f65fbf71ea6224e27cf8dab91b776e0d
https://git.kernel.org/stable/c/f70c9d4fba46463a5b1c7b3ee9ee3b40c90dac03
https://git.kernel.org/stable/c/fdfb46c387241b4eddd36d746793764413285913

History

Fri, 04 Sep 2026 05:15:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Thu, 03 Sep 2026 13:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-362 CWE-416

Thu, 03 Sep 2026 07:30:00 +0000

Type	Values Removed	Values Added
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.
Title		serial: amba-pl011: synchronize DMA teardown
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/440915499231e9db1c361aa45bb702e8fd3b4a32 https://git.kernel.org/stable/c/44bd0ecc3444882d08ecfbc2b2418d2f463d3186 https://git.kernel.org/stable/c/5974cb66681eac367107b05924744d7e3b49d41c https://git.kernel.org/stable/c/9f6989e477f03a4721d34bb4b09b17accd40283e https://git.kernel.org/stable/c/a38fae9d212e2d3ed5e9ec0ef773f8c0a27fb76e https://git.kernel.org/stable/c/c8c8e895f65fbf71ea6224e27cf8dab91b776e0d https://git.kernel.org/stable/c/f70c9d4fba46463a5b1c7b3ee9ee3b40c90dac03 https://git.kernel.org/stable/c/fdfb46c387241b4eddd36d746793764413285913

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-09-03T08:21:52.539Z

Updated: 2026-09-04T04:58:22.813Z

Reserved: 2026-08-26T14:34:25.789Z

Link: CVE-2026-80737

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-09-03T13:06:12.623

Modified: 2026-09-04T05:17:14.247

Link: CVE-2026-80737

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-03T13:15:04Z

Weaknesses

CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416
Use After Free

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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