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NVD / CVE Program· CNA Linux

CVE-2026-72310: smb: client: fix overflow in passthrough ioctl bounds check

HighCVSS 8.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 32/100)

  • 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: 0.64% (FIRST EPSS); higher than 51.3% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 160045fc943f6c46b227644261252c8a22b8a87a, 1627e7d5c9b09721a141d07cedb178882f1ded67, 175357ee0c596cb82054650dfa32fda51ad35aaa.

Low priority for now. Upgrade to Linux Linux 160045fc943f6c46b227644261252c8a22b8a87a, 1627e7d5c9b09721a141d07cedb178882f1ded67, 175357ee0c596cb82054650dfa32fda51ad35aaa 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: fix overflow in passthrough ioctl bounds check smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace. The payload offset and length both come from 32-bit fields. The bounds check currently adds OutputOffset and qi.input_buffer_length directly, so the addition can wrap in 32-bit arithmetic before the result is compared against the response buffer length. A malicious server can use a large OutputOffset and a small OutputCount to make the wrapped sum pass the bounds check. The later copy_to_user() then reads from io_rsp + OutputOffset, outside the response buffer. Use size_add() for the offset plus length check so overflow is treated as out of bounds.

Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.6% · 51th percentile
CWE
—

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.1
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-2026-72310

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

    • 2005c32ec99ee2490e8131b3953f3f212009ffea, 5.5affected
    • 2b1116bbe898aefdf584838448c6869f69851e0f and later · before 175357ee0c596cb82054650dfa32fda51ad35aaaaffected · git
    • 2b1116bbe898aefdf584838448c6869f69851e0f and later · before dbd126539c098dba3159ce7d34b10b2daddcbd0faffected · git
    • 2b1116bbe898aefdf584838448c6869f69851e0f and later · before 63feb687e89a3a52a31e6e01764117cc500f1974affected · git
    • 2b1116bbe898aefdf584838448c6869f69851e0f and later · before 160045fc943f6c46b227644261252c8a22b8a87aaffected · git
    • 2b1116bbe898aefdf584838448c6869f69851e0f and later · before b30771b69eafae750afb7385fbcc3d77ed3f3670affected · git
    • 2b1116bbe898aefdf584838448c6869f69851e0f and later · before 1627e7d5c9b09721a141d07cedb178882f1ded67affected · git
    • 2b1116bbe898aefdf584838448c6869f69851e0f and later · before 1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9affected · git
    • 2b1116bbe898aefdf584838448c6869f69851e0f and later · before a4f27ad055392fa164f5649e89a3637b033c5fccaffected · git
    • 5.4.69 and later · before 5.5affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

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-2026-72305Aug 15, 2026 · VDUSE: avoid leaking information to userspace
    0Monitor
  • ← EarlierCVE-2026-72306Aug 15, 2026 · vduse: Fix race in vduse_dev_msg_sync and vduse_dev_read_iter
    0Monitor
  • Later →CVE-2026-72312Aug 15, 2026 · octeontx2-af: fix VF bringup affecting PF promiscuous state
    31Monitor

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 Linux160045fc943f6c46b227644261252c8a22b8a87aVendor (CNA)
Linux Linux1627e7d5c9b09721a141d07cedb178882f1ded67Vendor (CNA)
Linux Linux175357ee0c596cb82054650dfa32fda51ad35aaaVendor (CNA)
Linux Linux1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux63feb687e89a3a52a31e6e01764117cc500f1974Vendor (CNA)
Linux Linuxa4f27ad055392fa164f5649e89a3637b033c5fccVendor (CNA)
Linux Linuxb30771b69eafae750afb7385fbcc3d77ed3f3670Vendor (CNA)
Linux Linuxdbd126539c098dba3159ce7d34b10b2daddcbd0fVendor (CNA)
debian:linux6.1.180-1 · 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).

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • 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
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/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.

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

References

Show all references (7 more)

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

All records