CVE-2026-68160Network attack vector

Pre-auth kernel corruption via unchecked snaptrace length

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds read in the Linux kernel CephFS client allows remote attackers controlling an MDS connection to corrupt kernel snapshot state. ceph_handle_caps() trusts snap_trace_len and constructs a false buffer end, so ceph_update_snap_trace() accepts reads beyond the message front buffer. A mounted CephFS client with an open MDS session is required; a malicious or compromised MDS can cause a kernel fault, fence I/O, or close MDS sessions.

CVSS severity9.8
Critical
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel CephFS client allows remote attackers controlling an MDS connection to corrupt kernel snapshot state. ceph_handle_caps() trusts snap_trace_len and constructs a false buffer end, so ceph_update_snap_trace() accepts reads beyond the message front buffer. A mounted CephFS client with an open MDS session is required; a malicious or compromised MDS can cause a kernel fault, fence I/O, or close MDS sessions.

The record

CVE
CVE-2026-68160
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, CAPEC-540, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.34
  2. Affected versionversion=a8599bd821d084d04a3290fffae1071624ec00ea <03b417afce19ee6b6e61f1bbbbebac924c9f36d1
  3. Affected versionversion=a8599bd821d084d04a3290fffae1071624ec00ea <4dbc71bcaf9a30abf3920a4e2cc4ed33bba78c02
  4. Affected versionversion=a8599bd821d084d04a3290fffae1071624ec00ea <71893c342a26bcff92eaab0b2b75d64aed19308a
  5. Affected versionversion=a8599bd821d084d04a3290fffae1071624ec00ea <9081c71796724ffe96cba253f68fbe42363c5295
  6. Affected versionversion=a8599bd821d084d04a3290fffae1071624ec00ea <a4228b93706fb74a484e6ffb271c1cc2af3a2ddb

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=a8599bd821d084d04a3290fffae1071624ec00ea <03b417afce19ee6b6e61f1bbbbebac924c9f36d1; version=a8599bd821d084d04a3290fffae1071624ec00ea <4dbc71bcaf9a30abf3920a4e2cc4ed33bba78c02; version=a8599bd821d084d04a3290fffae1071624ec00ea <71893c342a26bcff92eaab0b2b75d64aed19308a; version=a8599bd821d084d04a3290fffae1071624ec00ea <9081c71796724ffe96cba253f68fbe42363c5295; version=a8599bd821d084d04a3290fffae1071624ec00ea <a4228b93706fb74a484e6ffb271c1cc2af3a2ddb

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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