Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Wrap DCN32 phantom-plane allocation in…
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Wrap DCN32 phantom-plane allocation in DC_RUN_WITH_PREEMPTION_ENABLED [Why] dcn32_validate_bandwidth() wraps dcn32_internal_validate_bw() with DC_FP_START()/DC_FP_END(). In x86 non-RT, DC_FP_START takes fpregs_lock(), which disables local softirqs. The DML1 path through dcn32_enable_phantom_plane() calls kvzalloc() to allocate ~335 KiB for dc_plane_state. This triggers the vmalloc path, which calls BUG_ON(in_interrupt()) because it's invoked within the FPU-enabled (softirq disabled) region, leading to a kernel crash. [How] Wrap the dc_state_create_phantom_plane() call with the DC_RUN_WITH_PREEMPTION_ENABLED() macro to allow preemption during this memory allocation. (cherry picked from commit 885ccbef7b94a8b38f69c4211c679021aa27ad11)
AI Analysis
Technical Summary
The Linux kernel vulnerability involves the drm/amd/display component where the function dcn32_enable_phantom_plane() calls kvzalloc() to allocate approximately 335 KiB for dc_plane_state within a region where local softirqs are disabled due to floating point register locking (fpregs_lock). This violates kernel constraints because vmalloc calls are not allowed in interrupt context, causing a BUG_ON and kernel crash. The resolution was to wrap the dc_state_create_phantom_plane() call with DC_RUN_WITH_PREEMPTION_ENABLED(), allowing preemption during the allocation and avoiding the crash. This fix was cherry-picked into the linux-hwe-edge kernel.
Potential Impact
The vulnerability causes a kernel crash (denial of service) due to improper memory allocation in a context where it is disallowed. There is no impact on confidentiality or integrity. The crash affects system availability on affected Linux kernel versions.
Mitigation Recommendations
A fix is available that wraps the problematic memory allocation with a macro enabling preemption during the operation. Users should update to linux-hwe-edge kernel versions 7.0.0-28.28.1 or later where this fix is included. Patch status is confirmed by the provided description. No additional mitigations are indicated.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Wrap DCN32 phantom-plane allocation in…
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Wrap DCN32 phantom-plane allocation in DC_RUN_WITH_PREEMPTION_ENABLED [Why] dcn32_validate_bandwidth() wraps dcn32_internal_validate_bw() with DC_FP_START()/DC_FP_END(). In x86 non-RT, DC_FP_START takes fpregs_lock(), which disables local softirqs. The DML1 path through dcn32_enable_phantom_plane() calls kvzalloc() to allocate ~335 KiB for dc_plane_state. This triggers the vmalloc path, which calls BUG_ON(in_interrupt()) because it's invoked within the FPU-enabled (softirq disabled) region, leading to a kernel crash. [How] Wrap the dc_state_create_phantom_plane() call with the DC_RUN_WITH_PREEMPTION_ENABLED() macro to allow preemption during this memory allocation. (cherry picked from commit 885ccbef7b94a8b38f69c4211c679021aa27ad11)
CVSS v3.1
Score 5.5medium
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability involves the drm/amd/display component where the function dcn32_enable_phantom_plane() calls kvzalloc() to allocate approximately 335 KiB for dc_plane_state within a region where local softirqs are disabled due to floating point register locking (fpregs_lock). This violates kernel constraints because vmalloc calls are not allowed in interrupt context, causing a BUG_ON and kernel crash. The resolution was to wrap the dc_state_create_phantom_plane() call with DC_RUN_WITH_PREEMPTION_ENABLED(), allowing preemption during the allocation and avoiding the crash. This fix was cherry-picked into the linux-hwe-edge kernel.
Potential Impact
The vulnerability causes a kernel crash (denial of service) due to improper memory allocation in a context where it is disallowed. There is no impact on confidentiality or integrity. The crash affects system availability on affected Linux kernel versions.
Mitigation Recommendations
A fix is available that wraps the problematic memory allocation with a macro enabling preemption during the operation. Users should update to linux-hwe-edge kernel versions 7.0.0-28.28.1 or later where this fix is included. Patch status is confirmed by the provided description. No additional mitigations are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53285
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu: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: 6a5a00d191ae9bcd3f7f1bdb
Added to database: 07/17/2026, 10:15:45 UTC
Last enriched: 07/20/2026, 22:02:18 UTC
Last updated: 07/31/2026, 19:24:46 UTC
Views: 5
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