CVE-2026-80802

Physical system crash via unchecked NFC length

Published Sep 4, 2026 · Updated Sep 4, 2026

Out-of-bounds write in Linux kernel 4.4 through 7.2.0 allows physically proximate attackers to crash the system via an NFC controller. The fdp_nci_i2c_read function uses an unchecked device-supplied length as the I2C receive count for a 261-byte stack buffer and can also replace an allocated skb without freeing it. Exploitation requires the FDP NFC driver and a malicious controller or I2C interposer; oversized frames corrupt the kernel stack, while repeated data frames consume unreclaimable memory.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Out-of-bounds write in Linux kernel 4.4 through 7.2.0 allows physically proximate attackers to crash the system via an NFC controller. The fdp_nci_i2c_read function uses an unchecked device-supplied length as the I2C receive count for a 261-byte stack buffer and can also replace an allocated skb without freeing it. Exploitation requires the FDP NFC driver and a malicious controller or I2C interposer; oversized frames corrupt the kernel stack, while repeated data frames consume unreclaimable memory.

The record

CVE
CVE-2026-80802
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=4.4
  2. Affected versionversion=a06347c04c13e380afce0c9816df51f00b83faf1 <0d723090645b82c1cb27cfd7ebf81f0e7c96bcae
  3. Affected versionversion=a06347c04c13e380afce0c9816df51f00b83faf1 <1aa3fc769b0c45bd19f8dab1697084c2b3f6d706
  4. Affected versionversion=a06347c04c13e380afce0c9816df51f00b83faf1 <1fc32327b927a6e2cde086f82575c29880844228
  5. Affected versionversion=a06347c04c13e380afce0c9816df51f00b83faf1 <7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1
  6. Affected versionversion=a06347c04c13e380afce0c9816df51f00b83faf1 <8d2c243b79854628ff076c38748c020042f02f57
  7. Affected versionversion=a06347c04c13e380afce0c9816df51f00b83faf1 <d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee
  8. Affected versionversion=a06347c04c13e380afce0c9816df51f00b83faf1 <db7e464b350969c6ea8340de00d9796e5fd5123b
  9. Affected versionversion=a06347c04c13e380afce0c9816df51f00b83faf1 <e5eec121f2c3bc4c7022613bedd9121a8aa4c949
  10. Affected versionversion=a06347c04c13e380afce0c9816df51f00b83faf1 <fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.4; version=a06347c04c13e380afce0c9816df51f00b83faf1 <0d723090645b82c1cb27cfd7ebf81f0e7c96bcae; version=a06347c04c13e380afce0c9816df51f00b83faf1 <1aa3fc769b0c45bd19f8dab1697084c2b3f6d706; version=a06347c04c13e380afce0c9816df51f00b83faf1 <1fc32327b927a6e2cde086f82575c29880844228; version=a06347c04c13e380afce0c9816df51f00b83faf1 <7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1; version=a06347c04c13e380afce0c9816df51f00b83faf1 <8d2c243b79854628ff076c38748c020042f02f57; version=a06347c04c13e380afce0c9816df51f00b83faf1 <d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee; version=a06347c04c13e380afce0c9816df51f00b83faf1 <db7e464b350969c6ea8340de00d9796e5fd5123b; version=a06347c04c13e380afce0c9816df51f00b83faf1 <e5eec121f2c3bc4c7022613bedd9121a8aa4c949; version=a06347c04c13e380afce0c9816df51f00b83faf1 <fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectorphysical
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1200Hardware Additions

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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