CVE-2025-68284
A critical vulnerability in the Linux kernel’s libceph component could allow attackers to write outside intended memory bounds when processing authentication data from untrusted network packets. The issue has been fixed by adding boundary checks in the handle_auth_session_key() function. Users should update to a kernel version that includes this patch.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel users, especially those running Ceph storage or other services that use the libceph component.
Real-world impact
An attacker could overwrite memory, potentially leading to arbitrary code execution, denial of service, or data corruption.
Why this severity
The CVSS score of 9.8 reflects that the vulnerability is exploitable over the network with no authentication or user interaction, and it can compromise confidentiality, integrity, and availability.
What to do about it
- 01Upgrade your Linux kernel to a version that includes the libceph patch that prevents out-of-bounds writes in handle_auth_session_key().
- 02Reboot the system to load the updated kernel.
NVD description
Timeline
- Dec 16, 2025 · Dec 16, 2025PublishedDisclosed and added to the National Vulnerability Database.
- Jul 30, 2026 · 6d agoAdvisory updatedThe NVD record was last revised.
- Jul 30, 2026 · 6d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.