Skip to content
Noroxi
NVD / CVE Program· CNA Linux

CVE-2026-68343: smb: client: validate DFS referral PathConsumed

Noroxi assessment

Priority: Monitor (action score 36/100)

  • 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: 0.51% (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 285bd4a5f3f156aa5869843b47a1b1380b774241, 2fdd6d196c656b376cc251e1e9ff110b3ed522e1, 5b439f39f33ec15d319ced3b025e122346fba987; 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 285bd4a5f3f156aa5869843b47a1b1380b774241, 2fdd6d196c656b376cc251e1e9ff110b3ed522e1, 5b439f39f33ec15d319ced3b025e122346fba987; 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: smb: client: validate DFS referral PathConsumed parse_dfs_referrals() validates that the response contains the fixed referral entry array and, on for-next, the per-referral string offsets. However, the response also contains a PathConsumed value that is later used for DFS path parsing. If a malformed response provides a PathConsumed value larger than the search name, later DFS parsing can advance beyond the end of the path. Validate PathConsumed against the search name length before storing it in the parsed referral.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
Aug 10, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 43th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.1
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-2026-68343

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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

    • 4.11affected
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before bfebe5110fd135d86d65a0a346e14c106b02028baffected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before 5b439f39f33ec15d319ced3b025e122346fba987affected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before 285bd4a5f3f156aa5869843b47a1b1380b774241affected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before 2fdd6d196c656b376cc251e1e9ff110b3ed522e1affected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before 9f88a99ed511651b2dc2177d6854b2d1b8322e75affected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before f6f5ee2aa33b350c671721b965251c42cebb962eaffected · git
    • before 4.11not affected · semver
    • 6.1.183 and later · up to and including 6.1.*not affected · semver
    • 6.6.148 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8bpftoolbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.160.1.el8_104.18.0-553.160.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.160.1.rt7.501.el8_104.18.0-553.160.1.rt7.501.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.160.1.rt7.501.el8_104.18.0-553.160.1.rt7.501.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.160.1.rt7.501.el8_104.18.0-553.160.1.rt7.501.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.160.1.rt7.501.el8_104.18.0-553.160.1.rt7.501.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.160.1.rt7.501.el8_104.18.0-553.160.1.rt7.501.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.160.1.rt7.501.el8_104.18.0-553.160.1.rt7.501.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.160.1.rt7.501.el8_104.18.0-553.160.1.rt7.501.el8_10
AlmaLinux:8kernel-rt-develbefore 4.18.0-553.160.1.rt7.501.el8_104.18.0-553.160.1.rt7.501.el8_10
AlmaLinux:8kernel-rt-modulesbefore 4.18.0-553.160.1.rt7.501.el8_104.18.0-553.160.1.rt7.501.el8_10

+65

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-2026-68336Aug 10, 2026 · bonding: fix devconf_all NULL dereference when IPv6 is disabled
    0Monitor
  • ← EarlierCVE-2026-68338Aug 10, 2026 · net/packet: avoid fanout hook re-registration after unregister
    31Monitor
  • Later →CVE-2026-68344Aug 10, 2026 · usb: atm: ueagle-atm: reject descriptors that confuse probe and disconnect
    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 Linux285bd4a5f3f156aa5869843b47a1b1380b774241Vendor (CNA)
Linux Linux2fdd6d196c656b376cc251e1e9ff110b3ed522e1Vendor (CNA)
Linux Linux5b439f39f33ec15d319ced3b025e122346fba987Vendor (CNA)
Linux Linux9f88a99ed511651b2dc2177d6854b2d1b8322e75Vendor (CNA)
Linux Linuxbfebe5110fd135d86d65a0a346e14c106b02028bVendor (CNA)
Linux Linuxf6f5ee2aa33b350c671721b965251c42cebb962eVendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.160.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.160.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.160.1.rt7.501.el8_10 · AlmaLinux:8Package 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-rt0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-core0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-devel0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-kvm0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-modules-extra0:4.18.0-553.160.1.rt7.501.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)

+4

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-2026-681600 days apartceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps()
    39Monitor
  • CVE-2026-683880 days apartsmb/client: handle overlapping allocated ranges in fallocate
    39Monitor
  • CVE-2026-680822 days apartlibceph: fix two unsafe bare decodes in decode_lockers()
    39Monitor
  • CVE-2026-720845 days apartscsi: target: Bound PR-OUT TransportID parsing to the received buffer
    39Monitor
  • CVE-2026-6455114 days apartsctp: validate STALE_COOKIE cause length before reading staleness
    36Monitor
  • CVE-2026-683260 days apartwifi: mwifiex: bound uAP association event IEs to the event buffer
    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
none
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
None
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:H/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.

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 (5 more)

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

All records