In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Limit BO list entry count to prevent resource exhaustion Userspace… (CVE-2026-23468)
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Limit BO list entry count to prevent resource exhaustion Userspace can pass an arbitrary number of BO list entries via the bo_number field. Although the previous multiplication overflow check prevents out-of-bounds allocation, a large number of entries could still cause excessive memory allocation (up to potentially gigabytes) and unnecessarily long list processing times. Introduce a hard limit of 128k entries per BO list, which is more than sufficient for any realistic use case (e.g., a single list containing all buffers in a large scene). This prevents memory exhaustion attacks and ensures predictable performance. Return -EINVAL if the requested entry count exceeds the limit (cherry picked from commit 688b87d39e0aa8135105b40dc167d74b5ada5332)
AI Analysis
Technical Summary
The Linux kernel's drm/amdgpu driver previously allowed userspace to specify an arbitrary number of buffer object (BO) list entries via the bo_number field. Although an overflow check prevented out-of-bounds allocations, a large number of entries could still cause excessive memory allocation (potentially gigabytes) and prolonged list processing, leading to resource exhaustion. The fix imposes a hard limit of 128,000 entries per BO list, which is sufficient for realistic use cases, returning an error (-EINVAL) if exceeded. This change prevents memory exhaustion attacks and stabilizes performance. The vulnerability is tracked as CVE-2026-23468 with a CVSS 3.1 score of 5.5 (medium severity). The issue affects Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related versions as listed. The vendor advisory confirms a patch is available and recommends updating to fixed versions.
Potential Impact
Exploitation of this vulnerability could allow a local user to cause resource exhaustion on the system by triggering excessive memory allocation and long processing times in the drm/amdgpu subsystem. This results in a denial of service condition due to memory exhaustion but does not impact confidentiality or integrity. The CVSS vector indicates local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high impact on availability.
Mitigation Recommendations
A patch is available that introduces a hard limit of 128k buffer object list entries in the drm/amdgpu driver to prevent resource exhaustion. Users should update their Linux kernel to version 6.8.0-1061.64~22.04.1 or later (or the corresponding patched versions listed) as provided by their distribution vendor. After applying the update, a system reboot is required to activate the fix. No additional mitigation steps are necessary beyond applying the official kernel update.
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Limit BO list entry count to prevent resource exhaustion Userspace… (CVE-2026-23468)
Description
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Limit BO list entry count to prevent resource exhaustion Userspace can pass an arbitrary number of BO list entries via the bo_number field. Although the previous multiplication overflow check prevents out-of-bounds allocation, a large number of entries could still cause excessive memory allocation (up to potentially gigabytes) and unnecessarily long list processing times. Introduce a hard limit of 128k entries per BO list, which is more than sufficient for any realistic use case (e.g., a single list containing all buffers in a large scene). This prevents memory exhaustion attacks and ensures predictable performance. Return -EINVAL if the requested entry count exceeds the limit (cherry picked from commit 688b87d39e0aa8135105b40dc167d74b5ada5332)
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
The Linux kernel's drm/amdgpu driver previously allowed userspace to specify an arbitrary number of buffer object (BO) list entries via the bo_number field. Although an overflow check prevented out-of-bounds allocations, a large number of entries could still cause excessive memory allocation (potentially gigabytes) and prolonged list processing, leading to resource exhaustion. The fix imposes a hard limit of 128,000 entries per BO list, which is sufficient for realistic use cases, returning an error (-EINVAL) if exceeded. This change prevents memory exhaustion attacks and stabilizes performance. The vulnerability is tracked as CVE-2026-23468 with a CVSS 3.1 score of 5.5 (medium severity). The issue affects Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related versions as listed. The vendor advisory confirms a patch is available and recommends updating to fixed versions.
Potential Impact
Exploitation of this vulnerability could allow a local user to cause resource exhaustion on the system by triggering excessive memory allocation and long processing times in the drm/amdgpu subsystem. This results in a denial of service condition due to memory exhaustion but does not impact confidentiality or integrity. The CVSS vector indicates local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high impact on availability.
Mitigation Recommendations
A patch is available that introduces a hard limit of 128k buffer object list entries in the drm/amdgpu driver to prevent resource exhaustion. Users should update their Linux kernel to version 6.8.0-1061.64~22.04.1 or later (or the corresponding patched versions listed) as provided by their distribution vendor. After applying the update, a system reboot is required to activate the fix. No additional mitigation steps are necessary beyond applying the official kernel update.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23468
- 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: 6a5b62792d1edb114c88dff5
Added to database: 07/18/2026, 11:24:41 UTC
Last enriched: 08/01/2026, 06:03:33 UTC
Last updated: 09/14/2026, 22:01:32 UTC
Views: 21
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