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CVE-2026-68154

CRITICALCVSS 9.8/10EPSS 0.63%

Last modified

CVE-2026-68154 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.63% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.63%

47.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= f24e9980eb860d8600cbe5ef3d2fd9295320d229, < 952ca5dc99913d169263f59fd689f586729a13c1; >= f24e9980eb860d8600cbe5ef3d2fd9295320d229, < 146461f09565afe3665e65b0423d3d6b0fe806c5; >= f24e9980eb860d8600cbe5ef3d2fd9295320d229, < 80fc40e11cda1b5d990a3f69c6efa344fb5cd987; >= f24e9980eb860d8600cbe5ef3d2fd9295320d229, < b8a9fb6bf806f9c4891e71ae1beab0c07c23a877; >= f24e9980eb860d8600cbe5ef3d2fd9295320d229, < 826cd1de5802fd392922785f9b64d76e65d2a100; >= f24e9980eb860d8600cbe5ef3d2fd9295320d229, < 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56; >= f24e9980eb860d8600cbe5ef3d2fd9295320d229, < 70998f91030ee083ecb336a1dff0701c20a38081; >= f24e9980eb860d8600cbe5ef3d2fd9295320d229, < 05f90284223381005d6bcddab3fda4a97f9c3401
LinuxLinux2.6.34

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-68154?
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.
How severe is CVE-2026-68154?
CVE-2026-68154 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.63% probability of exploitation in the next 30 days.
How do I fix CVE-2026-68154?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST