CVE-2025-40345

Kernel heap corruption via unchecked device PBA

Published Dec 12, 2025 · Updated Dec 12, 2025

Out-of-bounds access in the Linux kernel sddr55 USB storage driver allows physically proximate attackers to corrupt kernel heap memory. After each write, sddr55 reads new_pba from the device status packet and indexes pba_to_lba[] without checking it against the capacity-derived block count. Physical attachment of a malicious SDDR55-compatible USB storage device and a write through the driver are required; the resulting out-of-range mapping access corrupts kernel memory.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in the Linux kernel sddr55 USB storage driver allows physically proximate attackers to corrupt kernel heap memory. After each write, sddr55 reads new_pba from the device status packet and indexes pba_to_lba[] without checking it against the capacity-derived block count. Physical attachment of a malicious SDDR55-compatible USB storage device and a write through the driver are required; the resulting out-of-range mapping access corrupts kernel memory.

The record

CVE
CVE-2025-40345
Published
Dec 12, 2025
Updated
Dec 12, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1200
Attack vector
physical
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 12, 2025Record 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <04a8a6393f3f2f471e05eacca33282dd30b01432
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <26e9b5da3231da7dc357b363883b5b7b51a64092
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ebe8d479aaf4f41ac35e6955332304193c646f6
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a20f1dd19d21dcb70140ea5a71b1f8cbe0c7e68f
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aa64e0e17e3a5991a25e6a46007770c629039869
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b59d4fda7e7d0aff1043a7f742487cb829f5aac1
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d00a6c04a502cd52425dbf35588732c652b16490

What conditions does exploitation require?

Attack vectorphysical
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <04a8a6393f3f2f471e05eacca33282dd30b01432; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <26e9b5da3231da7dc357b363883b5b7b51a64092; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ebe8d479aaf4f41ac35e6955332304193c646f6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a20f1dd19d21dcb70140ea5a71b1f8cbe0c7e68f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <aa64e0e17e3a5991a25e6a46007770c629039869; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b59d4fda7e7d0aff1043a7f742487cb829f5aac1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d00a6c04a502cd52425dbf35588732c652b16490

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.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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