CVE-2026-47334: CWE-833 Deadlock in Canonical Ubuntu Linux
Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock in notification handling code. The bug can be triggered by an unprivileged local user and can result in kernel panic or deadlock.
AI Analysis
Technical Summary
This vulnerability is a deadlock issue (CWE-833) in Ubuntu Linux kernels 6.8.0, 6.17.0, and 7.0.0 due to AppArmor SAUCE patches that improperly sleep while holding a spinlock during notification handling. An unprivileged local user can trigger this condition, leading to kernel panic or deadlock, causing system instability or denial of service. The CVSS 3.1 base score is 5.5, reflecting a medium severity with local attack vector, low attack complexity, and no impact on confidentiality or integrity but high impact on availability.
Potential Impact
The vulnerability allows an unprivileged local user to cause a denial of service by triggering a kernel panic or deadlock. There is no impact on confidentiality or integrity. The system availability is severely affected, potentially requiring a reboot or manual intervention to recover.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict local user access and monitor for unusual system behavior that may indicate attempts to trigger this deadlock.
CVE-2026-47334: CWE-833 Deadlock in Canonical Ubuntu Linux
Description
Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock in notification handling code. The bug can be triggered by an unprivileged local user and can result in kernel panic or deadlock.
CVSS v3.1
Score 5.5medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a deadlock issue (CWE-833) in Ubuntu Linux kernels 6.8.0, 6.17.0, and 7.0.0 due to AppArmor SAUCE patches that improperly sleep while holding a spinlock during notification handling. An unprivileged local user can trigger this condition, leading to kernel panic or deadlock, causing system instability or denial of service. The CVSS 3.1 base score is 5.5, reflecting a medium severity with local attack vector, low attack complexity, and no impact on confidentiality or integrity but high impact on availability.
Potential Impact
The vulnerability allows an unprivileged local user to cause a denial of service by triggering a kernel panic or deadlock. There is no impact on confidentiality or integrity. The system availability is severely affected, potentially requiring a reboot or manual intervention to recover.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict local user access and monitor for unusual system behavior that may indicate attempts to trigger this deadlock.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- canonical
- Date Reserved
- 2026-05-19T10:37:36.433Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a188e08e29bf47b501d6829
Added to database: 5/28/2026, 6:48:40 PM
Last enriched: 5/28/2026, 7:04:44 PM
Last updated: 5/29/2026, 12:14:59 PM
Views: 25
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