In the Linux kernel, the following vulnerability has been resolved: dmaengine: at_hdmac: fix device leak on of_dma_xlate() Make sure to drop the… (CVE-2025-71191)
A vulnerability in the Linux kernel's dmaengine subsystem (at_hdmac driver) was identified and resolved. The issue involved a device reference leak during the of_dma_xlate() function, where the reference taken when looking up the DMA platform device was not properly released on successful allocation. This flaw could lead to resource exhaustion affecting system availability. The vulnerability has been assigned CVE-2025-71191 and is rated medium severity with a CVSS score of 5.5. Fixes have been released in updated Linux kernel packages, particularly for Ubuntu 20.04 LTS and 22.04 LTS distributions, requiring system updates and reboots to apply. Users should update to the fixed kernel versions to mitigate the issue.
AI Analysis
Technical Summary
CVE-2025-71191 addresses a resource leak in the Linux kernel's dmaengine at_hdmac driver. Specifically, the of_dma_xlate() function failed to drop a device reference after successfully allocating a DMA channel, causing a device reference leak. Previous fixes addressed some error paths but did not cover the successful allocation path. This leak could degrade system stability by exhausting device references. The issue affects multiple Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and related versions. Ubuntu has released patches in their 5.15 kernel updates for various platforms, including NVIDIA Tegra, AWS, GCP, and generic kernels. The updates require rebooting the system and recompiling third-party kernel modules due to ABI changes.
Potential Impact
The vulnerability causes a device reference leak in the Linux kernel's DMA engine subsystem, which can lead to resource exhaustion and potentially impact system availability. There is no indication of confidentiality or integrity impact. The CVSS score of 5.5 reflects a medium severity with local attack vector, low complexity, and requiring low privileges. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages for affected versions. Users should apply the standard system update and reboot to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of any third-party kernel modules are required after updating. Ubuntu Pro users have access to extended support and fixes. No additional mitigation steps are indicated beyond applying the official updates.
In the Linux kernel, the following vulnerability has been resolved: dmaengine: at_hdmac: fix device leak on of_dma_xlate() Make sure to drop the… (CVE-2025-71191)
Description
A vulnerability in the Linux kernel's dmaengine subsystem (at_hdmac driver) was identified and resolved. The issue involved a device reference leak during the of_dma_xlate() function, where the reference taken when looking up the DMA platform device was not properly released on successful allocation. This flaw could lead to resource exhaustion affecting system availability. The vulnerability has been assigned CVE-2025-71191 and is rated medium severity with a CVSS score of 5.5. Fixes have been released in updated Linux kernel packages, particularly for Ubuntu 20.04 LTS and 22.04 LTS distributions, requiring system updates and reboots to apply. Users should update to the fixed kernel versions to mitigate the issue.
CVSS v3.1
Score 5.5medium
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-71191 addresses a resource leak in the Linux kernel's dmaengine at_hdmac driver. Specifically, the of_dma_xlate() function failed to drop a device reference after successfully allocating a DMA channel, causing a device reference leak. Previous fixes addressed some error paths but did not cover the successful allocation path. This leak could degrade system stability by exhausting device references. The issue affects multiple Linux kernel versions prior to 5.15.0-1099.102~20.04.1 and related versions. Ubuntu has released patches in their 5.15 kernel updates for various platforms, including NVIDIA Tegra, AWS, GCP, and generic kernels. The updates require rebooting the system and recompiling third-party kernel modules due to ABI changes.
Potential Impact
The vulnerability causes a device reference leak in the Linux kernel's DMA engine subsystem, which can lead to resource exhaustion and potentially impact system availability. There is no indication of confidentiality or integrity impact. The CVSS score of 5.5 reflects a medium severity with local attack vector, low complexity, and requiring low privileges. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages for affected versions. Users should apply the standard system update and reboot to ensure the fix is applied. Due to an ABI change, recompilation and reinstallation of any third-party kernel modules are required after updating. Ubuntu Pro users have access to extended support and fixes. No additional mitigation steps are indicated beyond applying the official updates.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2025-71191
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 3.1
Threat ID: 6a5b63af2d1edb114c8b8f08
Added to database: 07/18/2026, 11:29:51 UTC
Last enriched: 08/22/2026, 22:02:00 UTC
Last updated: 09/10/2026, 19:24:57 UTC
Views: 6
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