Horizon Alert
Summary of the vulnerability and why it matters
This CVE involves a flaw in the Linux kernel's Ceph storage component that could allow a specially crafted network message to cause a denial-of-service condition. The issue has been resolved by ensuring that certain data lengths are properly bounded during processing. The main concern is confirming relevance and exposure, as the vulnerability requires specific conditions within a Ceph environment to be exploitable.
- Flaw in Linux kernel's Ceph component.
- Matters if using Ceph storage in Linux.
- Confirm relevance and exposure to Ceph.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this vulnerability by sending a crafted OSD map to a Linux kernel that uses the Ceph filesystem. This could lead to a stack-based buffer overflow, potentially allowing for arbitrary code execution on the affected system.
- Network access to a Ceph monitor is required.
- Processing a malformed OSD map triggers the vulnerability.
- Risk of arbitrary code execution on the system.
Live Threat
Current exploitation, exposure, and threat context
The Linux kernel's Ceph component could be affected by a stack out-of-bounds write when processing specific OSDMap data. This vulnerability occurs when a monitor sends an OSDMap with an unusually long `pg_temp` or `pg_upmap` entry, potentially allowing an attacker to write to unintended memory locations on the stack.
- Kernel memory integrity.
- Malformed OSDMap data processed.
- System instability or crashes.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability resides within the Linux kernel's Ceph filesystem client, specifically in how it handles OSDMap data. Ownership likely falls to the infrastructure or platform team managing the Ceph cluster and its associated Linux hosts, in coordination with the application owners who rely on Ceph for storage. The first practical step is to confirm the presence of the affected Linux kernel component within your Ceph deployment, assess its reachability from untrusted sources (though unlikely given the context), and identify the specific hosts running this code.
- Infrastructure/Platform team owns remediation.
- Verify Ceph hosts and kernel component.
- Plan updates during maintenance windows.
