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NVD / CVE Program· CNA Linux

CVE-2026-72318: cifs: validate DFS referral string offsets

Noroxi assessment

Priority: Monitor (action score 37/100)

  • 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: 0.58% (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 027a84ac6b50c12ef767c15abfc58aa865820e9e, 76c607b9353d377b1d1b11db50e743eee0ccf658, 929a85932d14190988f1eafd6ee8cc68d66ace0b.

Low priority for now. Upgrade to Linux Linux 027a84ac6b50c12ef767c15abfc58aa865820e9e, 76c607b9353d377b1d1b11db50e743eee0ccf658, 929a85932d14190988f1eafd6ee8cc68d66ace0b 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: cifs: validate DFS referral string offsets parse_dfs_referrals() validates that the response header and referral array fit in the received buffer, but each referral also contains string offsets supplied by the server. Those offsets are used to compute the DfsPath and NetworkAddress string pointers without checking whether they still point inside the response buffer. A malformed referral can therefore make the computed pointer exceed the end of the buffer. The resulting negative max_len is then passed to cifs_strndup_from_utf16(), and the non-Unicode path forwards it to kstrndup() as a size_t, allowing strnlen() to read out of bounds. Validate each string offset before deriving the string pointer.

CriticalCVSS 9.4 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.5% · 48th percentile
CWE
—

Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
37 / 40 · 9.4 / 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
9.4
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.

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

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Follow CVE-2026-72318

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  • when exploit code appears or is weaponized
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  • 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

    • 4.11affected
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before 76c607b9353d377b1d1b11db50e743eee0ccf658affected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before d64b6be5740ce230aca184d8d224c75d9866045daffected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before 929a85932d14190988f1eafd6ee8cc68d66ace0baffected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before b784cd1c24d89bf71be2efe1e948ff7c03371e57affected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before c37abc99bb3de3d3219ecef253d649f74117fd83affected · git
    • 4ecce920e13ace16a5ba45efe8909946c28fb2ad and later · before 027a84ac6b50c12ef767c15abfc58aa865820e9eaffected · git
    • before 4.11not affected · semver
    • 6.1.178 and later · up to and including 6.1.*not affected · semver
    • 6.6.145 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:10kernelbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.65.1.el10_26.12.0-211.65.1.el10_2

+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-2026-72316Aug 15, 2026 · dm era: fix NULL pointer dereference in metadata_open()
    0Monitor
  • ← EarlierCVE-2026-72317Aug 15, 2026 · SUNRPC: pin upper rpc_clnt across the TLS connect_worker
    39Monitor
  • Later →CVE-2026-72319Aug 15, 2026 · ipvs: ensure inner headers in ICMP errors are in headroom
    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 Linux027a84ac6b50c12ef767c15abfc58aa865820e9eVendor (CNA)
Linux Linux76c607b9353d377b1d1b11db50e743eee0ccf658Vendor (CNA)
Linux Linux929a85932d14190988f1eafd6ee8cc68d66ace0bVendor (CNA)
Linux Linuxb784cd1c24d89bf71be2efe1e948ff7c03371e57Vendor (CNA)
Linux Linuxc37abc99bb3de3d3219ecef253d649f74117fd83Vendor (CNA)
Linux Linuxd64b6be5740ce230aca184d8d224c75d9866045dVendor (CNA)
almalinux:kernel6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.65.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo-common-aarch640:6.12.0-211.65.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+2

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.

No nightly-computed relations.

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
high · 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
High
Integrity impact
Low
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

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 (5 more)

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

All records