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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.71% (FIRST EPSS); higher than 53.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 05f90284223381005d6bcddab3fda4a97f9c3401, 146461f09565afe3665e65b0423d3d6b0fe806c5, 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 05f90284223381005d6bcddab3fda4a97f9c3401, 146461f09565afe3665e65b0423d3d6b0fe806c5, 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.7% · 53th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-68154

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.34affected
    • f24e9980eb860d8600cbe5ef3d2fd9295320d229 and later · before 952ca5dc99913d169263f59fd689f586729a13c1affected · git
    • f24e9980eb860d8600cbe5ef3d2fd9295320d229 and later · before 146461f09565afe3665e65b0423d3d6b0fe806c5affected · git
    • f24e9980eb860d8600cbe5ef3d2fd9295320d229 and later · before 80fc40e11cda1b5d990a3f69c6efa344fb5cd987affected · git
    • f24e9980eb860d8600cbe5ef3d2fd9295320d229 and later · before b8a9fb6bf806f9c4891e71ae1beab0c07c23a877affected · git
    • f24e9980eb860d8600cbe5ef3d2fd9295320d229 and later · before 826cd1de5802fd392922785f9b64d76e65d2a100affected · git
    • f24e9980eb860d8600cbe5ef3d2fd9295320d229 and later · before 3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56affected · git
    • f24e9980eb860d8600cbe5ef3d2fd9295320d229 and later · before 70998f91030ee083ecb336a1dff0701c20a38081affected · git
    • f24e9980eb860d8600cbe5ef3d2fd9295320d229 and later · before 05f90284223381005d6bcddab3fda4a97f9c3401affected · git
    • before 2.6.34not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.101-1~deb12u16.12.101-1~deb12u1
Debian:13linuxbefore 6.12.101-16.12.101-1
Debian:14linuxbefore 7.1.6-17.1.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68149Aug 10, 2026 · fs: preserve ACL_DONT_CACHE state in forget_cached_acl()
    33Monitor
  • ← EarlierCVE-2026-68153Aug 10, 2026 · libceph: remove debugfs files before client teardown
    31Monitor
  • Later →CVE-2026-68155Aug 10, 2026 · libceph: Reject monmaps advertising zero monitors
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux05f90284223381005d6bcddab3fda4a97f9c3401Vendor (CNA)
Linux Linux146461f09565afe3665e65b0423d3d6b0fe806c5Vendor (CNA)
Linux Linux3b2f1937f5fce8b7dd5432e7693e3cc8b5eece56Vendor (CNA)
Linux Linux70998f91030ee083ecb336a1dff0701c20a38081Vendor (CNA)
Linux Linux80fc40e11cda1b5d990a3f69c6efa344fb5cd987Vendor (CNA)
Linux Linux826cd1de5802fd392922785f9b64d76e65d2a100Vendor (CNA)
Linux Linux952ca5dc99913d169263f59fd689f586729a13c1Vendor (CNA)
Linux Linuxb8a9fb6bf806f9c4891e71ae1beab0c07c23a877Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days+1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-684775 days apartipvs: fix more places with wrong ipv6 transport offsets
    39Monitor
  • CVE-2026-720655 days apartnet: mana: Validate the packet length reported by the NIC
    39Monitor
  • CVE-2026-9999966 days apartipv4: validate checksum_start before completing checksum
    37Monitor
  • CVE-2026-681990 days apartwifi: ath6kl: fix OOB access from firmware ADDBA window size
    35Monitor
  • CVE-2026-684543 days apartKVM: s390: pci: Fix handling of AIF enable without AISB
    35Monitor
  • CVE-2026-684705 days apartwifi: mac80211: validate extension-frame layout before RX
    35Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records