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NVD / CVE Program· CNA Linux

CVE-2026-68433: libceph: bound get_version reply decode to front len

Noroxi assessment

Priority: Monitor (action score 34/100)

  • 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: 0.36% (FIRST EPSS).
  • 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 0d934c934ec746d53fc7e4f53239792647bbae63, 1307028f082756bf453e1889aee9983d30643a4b, 340e0386aa39da181015bee38f309018c335ce16; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.

Low priority for now. Upgrade to Linux Linux 0d934c934ec746d53fc7e4f53239792647bbae63, 1307028f082756bf453e1889aee9983d30643a4b, 340e0386aa39da181015bee38f309018c335ce16; 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: bound get_version reply decode to front len handle_get_version_reply() uses msg->front_alloc_len as the decode boundary for MON_GET_VERSION_REPLY. That is the size of the reused reply buffer, not the number of bytes actually received. A truncated reply can therefore pass ceph_decode_need() and decode the second u64 from stale tail bytes left in the buffer by an earlier message, causing an uninitialized memory read. Use msg->front.iov_len as the receive-side decode boundary, matching other libceph reply handlers and limiting decoding to the bytes that were actually read from the wire.

HighCVSS 8.6 · v3.1—No exploit Fix available
Published
Aug 12, 2026
Updated
Oct 19, 2026
EPSS
0.3% · 29th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.6
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-2026-68433

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

    • 3.16affected
    • 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 and later · before 1307028f082756bf453e1889aee9983d30643a4baffected · git
    • 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 and later · before f6cbf6878f3a1503c872ba8f1e69a58ee68d8b2eaffected · git
    • 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 and later · before 72a35070fcefa229b1b031aa7482ad3788e18f07affected · git
    • 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 and later · before 340e0386aa39da181015bee38f309018c335ce16affected · git
    • 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 and later · before d60de8253c85a02d0e6194b0735e7a562981a04caffected · git
    • 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 and later · before 4e7ebfaa0d14cf50e44041bfde38070d6dbc019faffected · git
    • 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 and later · before 0d934c934ec746d53fc7e4f53239792647bbae63affected · git
    • 513a8243d67f8e8d27f2883bd2f18bc87c7ca376 and later · before d3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0affected · git
    • before 3.16not 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-2026-68450Aug 11, 2026 · btrfs: free mapping node on duplicate reloc root insert
    0Monitor
  • ← EarlierCVE-2026-68432Aug 12, 2026 · vxlan: require CAP_NET_ADMIN in the device netns for changelink
    35Monitor
  • Later →CVE-2026-68435Aug 12, 2026 · LoongArch: Fix address space mismatch in kexec command line lookup
    0Monitor

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 Linux0d934c934ec746d53fc7e4f53239792647bbae63Vendor (CNA)
Linux Linux1307028f082756bf453e1889aee9983d30643a4bVendor (CNA)
Linux Linux340e0386aa39da181015bee38f309018c335ce16Vendor (CNA)
Linux Linux4e7ebfaa0d14cf50e44041bfde38070d6dbc019fVendor (CNA)
Linux Linux72a35070fcefa229b1b031aa7482ad3788e18f07Vendor (CNA)
Linux Linuxd3c32939fa0e3ee9b883b9a0fd1972c5c444e3d0Vendor (CNA)
Linux Linuxd60de8253c85a02d0e6194b0735e7a562981a04cVendor (CNA)
Linux Linuxf6cbf6878f3a1503c872ba8f1e69a58ee68d8b2eVendor (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

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-2026-681602 days apartceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
    39Monitor
  • CVE-2026-683882 days apartsmb/client: handle overlapping allocated ranges in fallocate
    39Monitor
  • CVE-2026-720843 days apartscsi: target: Bound PR-OUT TransportID parsing to the received buffer
    39Monitor
  • CVE-2026-680824 days apartlibceph: fix two unsafe bare decodes in decode_lockers()
    39Monitor
  • CVE-2026-6391224 days apartxfrm: esp: restore combined single-frag length gate
    39Monitor
  • CVE-2026-6393824 days apartKVM: SEV: Check PSC request indices against the actual size of the buffer
    37Monitor

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).

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
low · data can be read
Integrity
low · 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
Low
Integrity impact
Low
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

ATT&CK techniques

—

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