Linux azure: In the Linux kernel, the following vulnerability has been resolved: greybus: raw: fix use-after-free on cdev close This addresses a use-after-free…
A use-after-free vulnerability in the Linux kernel's greybus raw driver was fixed. The issue occurs when a raw bundle is disconnected but its character device (cdev) remains open by an application, leading to a panic due to refcount underflow if init-on-free is enabled. The fix involves embedding the device structure to align lifetimes and using cdev_device_add to manage device release properly.
AI Analysis
Technical Summary
This vulnerability in the Linux kernel's greybus raw driver causes a use-after-free condition when a raw bundle disconnects while its associated character device is still open. The cdev structure is freed during disconnect, but if the application later releases the cdev, it references freed memory, triggering a kernel panic with a refcount underflow warning. The fix changes the device pointer to an embedded structure, ensuring the cdev and device lifetimes are synchronized, and uses cdev_device_add to delay device release until all references are dropped. The structure freeing is delegated to the device release function rather than immediate freeing in the disconnect callback.
Potential Impact
Exploitation of this vulnerability can cause a kernel panic and system instability due to use-after-free and refcount underflow. The vulnerability affects confidentiality, integrity, and availability as indicated by the CVSS vector (C:H/I:H/A:H). There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available that addresses the use-after-free by embedding the device structure and properly managing device lifetime with cdev_device_add. Users should update to patched Linux kernel versions that include this fix. Patch status is confirmed by the description of the resolved issue. No additional mitigations are indicated.
Linux azure: In the Linux kernel, the following vulnerability has been resolved: greybus: raw: fix use-after-free on cdev close This addresses a use-after-free…
Description
A use-after-free vulnerability in the Linux kernel's greybus raw driver was fixed. The issue occurs when a raw bundle is disconnected but its character device (cdev) remains open by an application, leading to a panic due to refcount underflow if init-on-free is enabled. The fix involves embedding the device structure to align lifetimes and using cdev_device_add to manage device release properly.
CVSS v3.1
Score 7.8high
Affected software
pkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email 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protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~18.04.1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips-updates/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email protected]?arch=source&distro=fips/bionicpkg:deb/ubuntu/[email 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in the Linux kernel's greybus raw driver causes a use-after-free condition when a raw bundle disconnects while its associated character device is still open. The cdev structure is freed during disconnect, but if the application later releases the cdev, it references freed memory, triggering a kernel panic with a refcount underflow warning. The fix changes the device pointer to an embedded structure, ensuring the cdev and device lifetimes are synchronized, and uses cdev_device_add to delay device release until all references are dropped. The structure freeing is delegated to the device release function rather than immediate freeing in the disconnect callback.
Potential Impact
Exploitation of this vulnerability can cause a kernel panic and system instability due to use-after-free and refcount underflow. The vulnerability affects confidentiality, integrity, and availability as indicated by the CVSS vector (C:H/I:H/A:H). There are no known exploits in the wild at this time.
Mitigation Recommendations
A fix is available that addresses the use-after-free by embedding the device structure and properly managing device lifetime with cdev_device_add. Users should update to patched Linux kernel versions that include this fix. Patch status is confirmed by the description of the resolved issue. No additional mitigations are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53025
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu: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","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5a014c91ae9bcd3f8021a7
Added to database: 07/17/2026, 10:17:48 UTC
Last enriched: 07/30/2026, 21:07:18 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 2
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