Critical 9.8Published Aug 10, 2026

CVE-2026-68154libceph: reject zero bucket types in crush_decode

Updated under an hour ago (Oct 27, 2026, 6:23 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: libceph: reject zero bucket types in crush_decode CRUSH bucket type 0 is reserved for devices. The mapper relies on that invariant and uses type 0 to identify leaf devices. If crush_decode() accepts a bucket with type 0, a malformed CRUSH map can make the mapper treat a negative bucket ID as a device and pass it to is_out(), which then indexes the OSD weight array with a negative value. Reject zero bucket types while decoding the CRUSH map so the invalid state never reaches the mapper.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f24e9980eb860d8600cbe5ef3d2fd9295320d229 before 952ca5dc99913d169263f59fd689f586729a13c1; from f24e9980eb860d8600cbe5ef3d2fd9295320d229 before 146461f09565afe3665e65b0423d3d6b0fe806c5; from f24e9980eb860d8600cbe5ef3d2fd9295320d229 before 80fc40e11cda1b5d990a3f69c6efa344fb5cd987; from f24e9980eb860d8600cbe5ef3d2fd9295320d229 before b8a9fb6bf806f9c4891e71ae1beab0c07c23a877; from f24e9980eb860d8600cbe5ef3d2fd9295320d229 before 826cd1de5802fd392922785f9b64d76e65d2a100; from f24e9980eb860d8600cbe5ef3d2fd9295320d229 before 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56; from f24e9980eb860d8600cbe5ef3d2fd9295320d229 before 70998f91030ee083ecb336a1dff0701c20a38081; from f24e9980eb860d8600cbe5ef3d2fd9295320d229 before 05f90284223381005d6bcddab3fda4a97f9c3401	CNA record

References

References

https://git.kernel.org/stable/c/952ca5dc99913d169263f59fd689f586729a13c1
https://git.kernel.org/stable/c/146461f09565afe3665e65b0423d3d6b0fe806c5
https://git.kernel.org/stable/c/80fc40e11cda1b5d990a3f69c6efa344fb5cd987
https://git.kernel.org/stable/c/b8a9fb6bf806f9c4891e71ae1beab0c07c23a877
https://git.kernel.org/stable/c/826cd1de5802fd392922785f9b64d76e65d2a100
https://git.kernel.org/stable/c/3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56
https://git.kernel.org/stable/c/70998f91030ee083ecb336a1dff0701c20a38081
https://git.kernel.org/stable/c/05f90284223381005d6bcddab3fda4a97f9c3401

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.