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NVD / CVE Program· CNA Linux

CVE-2026-68157: libceph: guard missing CRUSH type name lookup

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.69% (FIRST EPSS); higher than 53.1% 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 3767c9f0c1bbd98dd25cb088356a0fc6c1f09f50, 4716a64b7cc2797741f7be4e283ace78a9dff37d, 6a4b75d90f0cfbf22c14742ab35a803bc13f36ec; 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 3767c9f0c1bbd98dd25cb088356a0fc6c1f09f50, 4716a64b7cc2797741f7be4e283ace78a9dff37d, 6a4b75d90f0cfbf22c14742ab35a803bc13f36ec; 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: guard missing CRUSH type name lookup Localized read selection can walk a parent bucket whose name exists in the CRUSH map while its type has no matching entry in type_names. get_immediate_parent() then dereferences a NULL type_cn and passes an invalid pointer into strcmp(), causing a null-ptr-deref. Skip such malformed parent buckets unless both the bucket name and type name metadata are present. This keeps malformed hierarchy data from crashing locality lookup and safely falls back to "not local". [ idryomov: add WARN_ON_ONCE ]

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.6% · 53th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.5
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-2026-68157

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

    • 5.8affected
    • 117d96a04f007ce8fc2e292369056c3bd09f6f63 and later · before cbfcba275326c8c7dae9acd8f4a0d4c316fdafb0affected · git
    • 117d96a04f007ce8fc2e292369056c3bd09f6f63 and later · before 8ff579ac03d6e9d17d6d9c8443110167c14a382daffected · git
    • 117d96a04f007ce8fc2e292369056c3bd09f6f63 and later · before 6a4b75d90f0cfbf22c14742ab35a803bc13f36ecaffected · git
    • 117d96a04f007ce8fc2e292369056c3bd09f6f63 and later · before c46d82c47afc968d6ee8ef4470fa2dd35b765c21affected · git
    • 117d96a04f007ce8fc2e292369056c3bd09f6f63 and later · before 3767c9f0c1bbd98dd25cb088356a0fc6c1f09f50affected · git
    • 117d96a04f007ce8fc2e292369056c3bd09f6f63 and later · before 4716a64b7cc2797741f7be4e283ace78a9dff37daffected · git
    • 117d96a04f007ce8fc2e292369056c3bd09f6f63 and later · before db9cc9fd9660b2d69ee66f5a4cbec83c21a1c64daffected · git
    • 117d96a04f007ce8fc2e292369056c3bd09f6f63 and later · before bbeae12fda3384a90fbebc8a19ba9d33f85b5361affected · git
    • before 5.8not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:9kernelbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64kbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-corebefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-debugbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-develbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-corebefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-cross-headersbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-debugbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-debug-corebefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-debug-develbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8
AlmaLinux:9kernel-debug-modules-corebefore 5.14.0-687.50.1.el9_85.14.0-687.50.1.el9_8

+96

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-2026-68155Aug 10, 2026 · libceph: Reject monmaps advertising zero monitors
    30Monitor
  • ← EarlierCVE-2026-68156Aug 10, 2026 · libceph: refresh auth->authorizer_buf{,_len} after authorizer update
    39Monitor
  • Later →CVE-2026-68158Aug 10, 2026 · libceph: Fix multiplication overflow in decode_new_up_state_weight()
    39Monitor

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 Linux3767c9f0c1bbd98dd25cb088356a0fc6c1f09f50Vendor (CNA)
Linux Linux4716a64b7cc2797741f7be4e283ace78a9dff37dVendor (CNA)
Linux Linux6a4b75d90f0cfbf22c14742ab35a803bc13f36ecVendor (CNA)
Linux Linux8ff579ac03d6e9d17d6d9c8443110167c14a382dVendor (CNA)
Linux Linuxbbeae12fda3384a90fbebc8a19ba9d33f85b5361Vendor (CNA)
Linux Linuxc46d82c47afc968d6ee8ef4470fa2dd35b765c21Vendor (CNA)
Linux Linuxcbfcba275326c8c7dae9acd8f4a0d4c316fdafb0Vendor (CNA)
Linux Linuxdb9cc9fd9660b2d69ee66f5a4cbec83c21a1c64dVendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.50.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-687.50.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-687.50.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-687.50.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-687.50.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-687.50.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-687.50.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-687.50.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)

+6

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-2026-681360 days apartnet: gro: fix double aggregation of flush-marked skbs
    39Monitor
  • CVE-2026-683850 days aparts390/checksum: Fix csum_partial() without vector facility
    39Monitor
  • CVE-2026-683540 days apartfirewire: net: Fix fragmented datagram reassembly
    35Monitor
  • CVE-2025-68818209 days apartscsi: Revert "scsi: qla2xxx: Perform lockless command completion in abort path"
    35Monitor
  • CVE-2026-720355 days apartnet/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked
    32Monitor
  • CVE-2026-683050 days apartdrm/xe/vf: Add drm_dev guards when detaching CCS read/write buffers
    31Monitor

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

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

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