Bug 2422800 (CVE-2025-68283)

Summary: CVE-2025-68283 kernel: libceph: replace BUG_ON with bounds check for map->max_osd
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the libceph module of the Linux kernel. OSD index values received from network packets were not properly validated against map->max_osd before use, with only a BUG_ON assertion as protection. A malicious or compromised Ceph cluster could send out-of-bounds OSD indexes, potentially causing kernel crashes or memory corruption.
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Description OSIDB Bzimport 2025-12-16 16:02:31 UTC 
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 ]
Comment 1 Alexander B 2025-12-16 19:40:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121637-CVE-2025-68283-77dd@gregkh/T