Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths In… (CVE-2026-53313)
A vulnerability in the Linux kernel's AMD display driver (drm/amd/display) could cause a NULL pointer dereference leading to a system crash. The issue occurs in error handling paths where a NULL check is improperly implemented, causing the logging function to dereference a NULL pointer. This flaw has been fixed by adjusting the NULL checks to prevent the crash. The vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch is available and should be applied to mitigate the issue.
AI Analysis
Technical Summary
The Linux kernel contained a vulnerability in the drm/amd/display subsystem where error handling functions dc_dmub_srv_log_diagnostic_data() and dc_dmub_srv_enable_dpia_trace() performed NULL checks incorrectly. They checked if dc_dmub_srv or dc_dmub_srv->dmub were NULL and then called DC_LOG_ERROR(), which internally uses dc_dmub_srv->ctx. If dc_dmub_srv was NULL, this led to a NULL pointer dereference and a kernel crash. The fix splits the NULL checks to first return immediately if dc_dmub_srv is NULL, then log errors only if dc_dmub_srv is valid. This vulnerability is tracked as CVE-2026-53313 and affects Linux kernel versions prior to 7.0.0-28.28 and related variants.
Potential Impact
The vulnerability can cause a denial of service by crashing the kernel due to a NULL pointer dereference in the AMD display driver error paths. There is no indication of confidentiality or integrity impact. The CVSS score is 5.5 (medium severity) reflecting local attack vector with low complexity and no user interaction required, resulting in availability impact only.
Mitigation Recommendations
A patch is available and should be applied by updating to Linux kernel versions 7.0.0-28.28 or later (and related fixed builds). After applying the update, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow the vendor's update instructions carefully to ensure the fix is applied.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths In… (CVE-2026-53313)
Description
A vulnerability in the Linux kernel's AMD display driver (drm/amd/display) could cause a NULL pointer dereference leading to a system crash. The issue occurs in error handling paths where a NULL check is improperly implemented, causing the logging function to dereference a NULL pointer. This flaw has been fixed by adjusting the NULL checks to prevent the crash. The vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. A patch is available and should be applied to mitigate the issue.
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=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel contained a vulnerability in the drm/amd/display subsystem where error handling functions dc_dmub_srv_log_diagnostic_data() and dc_dmub_srv_enable_dpia_trace() performed NULL checks incorrectly. They checked if dc_dmub_srv or dc_dmub_srv->dmub were NULL and then called DC_LOG_ERROR(), which internally uses dc_dmub_srv->ctx. If dc_dmub_srv was NULL, this led to a NULL pointer dereference and a kernel crash. The fix splits the NULL checks to first return immediately if dc_dmub_srv is NULL, then log errors only if dc_dmub_srv is valid. This vulnerability is tracked as CVE-2026-53313 and affects Linux kernel versions prior to 7.0.0-28.28 and related variants.
Potential Impact
The vulnerability can cause a denial of service by crashing the kernel due to a NULL pointer dereference in the AMD display driver error paths. There is no indication of confidentiality or integrity impact. The CVSS score is 5.5 (medium severity) reflecting local attack vector with low complexity and no user interaction required, resulting in availability impact only.
Mitigation Recommendations
A patch is available and should be applied by updating to Linux kernel versions 7.0.0-28.28 or later (and related fixed builds). After applying the update, a system reboot is required. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow the vendor's update instructions carefully to ensure the fix is applied.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-53313
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro: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: 6a5a00c091ae9bcd3f7f01a1
Added to database: 07/17/2026, 10:15:28 UTC
Last enriched: 09/07/2026, 21:36:28 UTC
Last updated: 09/14/2026, 22:01:35 UTC
Views: 23
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