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CVE-2026-72066· NVD / CVE Program· CNA Linux

cpu: hotplug: Bound hotplug states sysfs output

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.17% (FIRST EPSS).
  • Someone with local access to the system 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 2408be459c70ef4250da1a9e50f5478e6b250d61, 27481cf4365a6ff5c9be3590143e7ed434000266, 61a73a123ac7a7fbc57382531f8cb7092d569aba.

Low priority for now. Upgrade to Linux Linux 2408be459c70ef4250da1a9e50f5478e6b250d61, 27481cf4365a6ff5c9be3590143e7ed434000266, 61a73a123ac7a7fbc57382531f8cb7092d569aba 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: cpu: hotplug: Bound hotplug states sysfs output states_show() adds CPU hotplug state names into a single sysfs buffer using sprintf(). With enough registered states, this can write past the end of the PAGE_SIZE buffer. Use sysfs_emit_at() so output is bounded.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 6th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
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-2026-72066

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

    • 4.6affected
    • 98f8cdce1db580b99fce823a48eea2cb2bdb261e and later · before 27481cf4365a6ff5c9be3590143e7ed434000266affected · git
    • 98f8cdce1db580b99fce823a48eea2cb2bdb261e and later · before 2408be459c70ef4250da1a9e50f5478e6b250d61affected · git
    • 98f8cdce1db580b99fce823a48eea2cb2bdb261e and later · before de4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635affected · git
    • 98f8cdce1db580b99fce823a48eea2cb2bdb261e and later · before 998f66e9ce320f3433f60b948e3698b744754a46affected · git
    • 98f8cdce1db580b99fce823a48eea2cb2bdb261e and later · before 61a73a123ac7a7fbc57382531f8cb7092d569abaaffected · git
    • 98f8cdce1db580b99fce823a48eea2cb2bdb261e and later · before 6cb15b81ff545840048fb0e1a6e827d560dbf367affected · git
    • 98f8cdce1db580b99fce823a48eea2cb2bdb261e and later · before 631d53102da9f469c96b882b770336bec095b833affected · git
    • 98f8cdce1db580b99fce823a48eea2cb2bdb261e and later · before 86f436567f2516a0083b210bedc933544826a2c3affected · git
    • before 4.6not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
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-2026-72064Aug 15, 2026 · net: mana: Sync page pool RX frags for CPU
    39Monitor
  • ← EarlierCVE-2026-72065Aug 15, 2026 · net: mana: Validate the packet length reported by the NIC
    39Monitor
  • Later →CVE-2026-72067Aug 15, 2026 · cpu: hotplug: Preserve per instance callback errors
    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 Linux2408be459c70ef4250da1a9e50f5478e6b250d61Vendor (CNA)
Linux Linux27481cf4365a6ff5c9be3590143e7ed434000266Vendor (CNA)
Linux Linux61a73a123ac7a7fbc57382531f8cb7092d569abaVendor (CNA)
Linux Linux631d53102da9f469c96b882b770336bec095b833Vendor (CNA)
Linux Linux6cb15b81ff545840048fb0e1a6e827d560dbf367Vendor (CNA)
Linux Linux86f436567f2516a0083b210bedc933544826a2c3Vendor (CNA)
Linux Linux998f66e9ce320f3433f60b948e3698b744754a46Vendor (CNA)
Linux Linuxde4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635Vendor (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).

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-2026-684512 days aparts390/zcrypt: Validate length for CCA ECC private key requests
    31Monitor
  • CVE-2026-684522 days aparts390/zcrypt: Validate length for CCA AES cipher key requests
    31Monitor

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

  • Someone with local access to the system 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
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

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

nvd-secondary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
char buf[256];memcpy(buf, pkt->data, pkt->len);

Fixed

c
char buf[256];if (pkt->len > sizeof(buf)) {  return -EINVAL;}memcpy(buf, pkt->data, pkt->len);

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