CVE-2026-53146

Stale data disclosure via short XDomain responses

Published Jun 25, 2026 · Updated Jun 25, 2026

Out-of-bounds read in the Thunderbolt XDomain component of Linux Kernel allows attackers to obtain stale data through a short response. The tb_xdomain_copy() function copies the expected response size from a DMA pool buffer without limiting the copy to the received frame size. An unauthenticated peer on the adjacent Thunderbolt or USB4 fabric must supply the short frame; the over-read exposes stale prior-transaction data and can corrupt limited XDomain protocol state.

CVSS severity7.1
High
EPSS probability0.24%
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 read in the Thunderbolt XDomain component of Linux Kernel allows attackers to obtain stale data through a short response. The tb_xdomain_copy() function copies the expected response size from a DMA pool buffer without limiting the copy to the received frame size. An unauthenticated peer on the adjacent Thunderbolt or USB4 fabric must supply the short frame; the over-read exposes stale prior-transaction data and can corrupt limited XDomain protocol state.

The record

CVE
CVE-2026-53146
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=4.15
  2. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <033dfa63bf6be2653441a1dccae4a8313a91bb9d
  3. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <4db2bd2ed4785dbadaeeab9f4e346b21ac5fb8eb
  4. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <7720654b4842bcdfeb64bc002f6186041849e1e7
  5. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <a15b6d3136accb2bf84b04d9a3ddd991f7fbf1cb
  6. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <b2c1e5d9f1598cc1a4736d5c6bd1218f90805ee4
  7. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <b5daa920f44cb582272fc9bfaeb67408776cbaef
  8. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <c55da494dfb445fb28df3a9d293c2be6a299cd01
  9. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <fc261397295b8ad0654cec747b0ec25ea0011995

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.15; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <033dfa63bf6be2653441a1dccae4a8313a91bb9d; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <4db2bd2ed4785dbadaeeab9f4e346b21ac5fb8eb; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <7720654b4842bcdfeb64bc002f6186041849e1e7; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <a15b6d3136accb2bf84b04d9a3ddd991f7fbf1cb; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <b2c1e5d9f1598cc1a4736d5c6bd1218f90805ee4; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <b5daa920f44cb582272fc9bfaeb67408776cbaef; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <c55da494dfb445fb28df3a9d293c2be6a299cd01; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <fc261397295b8ad0654cec747b0ec25ea0011995

Published CVSS scores

2.4Amazon LinuxCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
7.1UbuntuCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
7.1LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

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