CVE-2026-68154

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxf24e9980eb860d8600cbe5ef3d2fd9295320d229 < b8a9fb6bf806f9c4891e71ae1beab0c07c23a877affected
LinuxLinuxf24e9980eb860d8600cbe5ef3d2fd9295320d229 < 826cd1de5802fd392922785f9b64d76e65d2a100affected
LinuxLinuxf24e9980eb860d8600cbe5ef3d2fd9295320d229 < 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56affected
LinuxLinuxf24e9980eb860d8600cbe5ef3d2fd9295320d229 < 70998f91030ee083ecb336a1dff0701c20a38081affected
LinuxLinuxf24e9980eb860d8600cbe5ef3d2fd9295320d229 < 05f90284223381005d6bcddab3fda4a97f9c3401affected
LinuxLinux2.6.34affected
LinuxLinux0 < 2.6.34unaffected
LinuxLinux6.6.148 <= 6.6.*unaffected
LinuxLinux6.12.101 <= 6.12.*unaffected
LinuxLinux6.18.42 <= 6.18.*unaffected
LinuxLinux7.1.6 <= 7.1.*unaffected
LinuxLinux7.2-rc5 <= *unaffected

Weaknesses

References