CVE-2025-68283 libceph: replace BUG_ON with bounds check for map->max_osd
A missing bounds check in the Linux kernel's libceph module allows remote attackers to cause a denial of service via crafted network packets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-68283?
CVE-2025-68283 is a high-severity denial of service vulnerability in Linux, published on 16 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
libceph: replace BUG_ON with bounds check for map->max_osd
OSD indexes come from untrusted network packets. Boundary checks are added to validate these against map->max_osd.
[ idryomov: drop BUG_ON in ceph_get_primary_affinity(), minor cosmetic edits ]
Which versions are affected by CVE-2025-68283?
How do I fix CVE-2025-68283?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-68283 being exploited?
There is no known exploitation of CVE-2025-68283 in the wild and no public exploit code.
Sources
Also known as AZL-72610, BELL-CVE-2025-68283, DEBIAN-CVE-2025-68283, GHSA-3g24-mff9-8mv9, ROOT-OS-DEBIAN-11-CVE-2025-68283, ROOT-OS-DEBIAN-12-CVE-2025-68283 and 4 more.