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… (CVE-2026-53025)
A use-after-free vulnerability in the Linux kernel's greybus raw character device driver was fixed. The flaw occurs when a raw bundle is disconnected but its character device remains open by an application, leading to a use-after-free condition and potential kernel panic if CONFIG_INIT_ON_FREE_DEFAULT_ON is enabled. This vulnerability affects multiple versions of the linux-azure kernel prior to specific fixed versions. A patch is available and should be applied to prevent potential system crashes and privilege escalation.
AI Analysis
Technical Summary
The Linux kernel greybus raw driver contained a use-after-free vulnerability triggered when a raw bundle disconnects while its character device (cdev) is still open. Upon later release of the cdev by an application, the kernel attempts to decrement a reference count on freed memory, causing a refcount underflow and kernel panic. The vulnerability is addressed by changing the struct device from a pointer to an embedded structure to prevent use-after-free. This issue is tracked as CVE-2026-53025 and affects linux-azure kernel versions prior to 7.0.0-28.28 and related versions. Ubuntu has released patches in their 7.0.0-28.28 and later kernel packages to fix this vulnerability.
Potential Impact
Exploitation of this use-after-free vulnerability can cause kernel panics leading to denial of service. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability, suggesting potential for privilege escalation or system compromise if exploited. However, no known exploits are reported in the wild at this time.
Mitigation Recommendations
A patch is available and should be applied promptly. Ubuntu has released fixed kernel packages (e.g., linux-image-7.0.0-28.28 and later) that address this vulnerability. After updating, a system reboot is required. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled. Follow vendor advisory instructions for updating and recompiling kernel modules to fully remediate the issue.
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… (CVE-2026-53025)
Description
A use-after-free vulnerability in the Linux kernel's greybus raw character device driver was fixed. The flaw occurs when a raw bundle is disconnected but its character device remains open by an application, leading to a use-after-free condition and potential kernel panic if CONFIG_INIT_ON_FREE_DEFAULT_ON is enabled. This vulnerability affects multiple versions of the linux-azure kernel prior to specific fixed versions. A patch is available and should be applied to prevent potential system crashes and privilege escalation.
CVSS v3.1
Score 7.8high
Affected software
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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
The Linux kernel greybus raw driver contained a use-after-free vulnerability triggered when a raw bundle disconnects while its character device (cdev) is still open. Upon later release of the cdev by an application, the kernel attempts to decrement a reference count on freed memory, causing a refcount underflow and kernel panic. The vulnerability is addressed by changing the struct device from a pointer to an embedded structure to prevent use-after-free. This issue is tracked as CVE-2026-53025 and affects linux-azure kernel versions prior to 7.0.0-28.28 and related versions. Ubuntu has released patches in their 7.0.0-28.28 and later kernel packages to fix this vulnerability.
Potential Impact
Exploitation of this use-after-free vulnerability can cause kernel panics leading to denial of service. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability, suggesting potential for privilege escalation or system compromise if exploited. However, no known exploits are reported in the wild at this time.
Mitigation Recommendations
A patch is available and should be applied promptly. Ubuntu has released fixed kernel packages (e.g., linux-image-7.0.0-28.28 and later) that address this vulnerability. After updating, a system reboot is required. Due to ABI changes, third-party kernel modules must be recompiled and reinstalled. Follow vendor advisory instructions for updating and recompiling kernel modules to fully remediate the issue.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53025
- Osv Schema Version
- 1.7.0
- 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"]
- Cvss Version
- 3.1
Threat ID: 6a5a014c91ae9bcd3f8021a7
Added to database: 07/17/2026, 10:17:48 UTC
Last enriched: 09/07/2026, 23:12:44 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 20
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