CVE-2026-53147

Kernel memory exposure via undersized XDomain packets

Published Jun 25, 2026 · Updated Jun 25, 2026

Out-of-bounds reads in the Linux Kernel Thunderbolt XDomain handler allow physically proximate attackers to expose kernel memory. The tb_xdp_handle_request() function accepts a packet after only a generic header-length check, then casts its kmemdup buffer to larger protocol-specific structures without checking the allocation size. XDomain must be enabled or allowed and a malicious Thunderbolt or USB4 peer must be connected; repeated malformed requests can expose adjacent heap data or interrupt the host through a kernel fault.

CVSS severity8.1
High
EPSS probability0.27%
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 reads in the Linux Kernel Thunderbolt XDomain handler allow physically proximate attackers to expose kernel memory. The tb_xdp_handle_request() function accepts a packet after only a generic header-length check, then casts its kmemdup buffer to larger protocol-specific structures without checking the allocation size. XDomain must be enabled or allowed and a malicious Thunderbolt or USB4 peer must be connected; repeated malformed requests can expose adjacent heap data or interrupt the host through a kernel fault.

The record

CVE
CVE-2026-53147
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1200
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 <07cd2787cdf8942d24a1a3ef81aa89b526fb6381
  3. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <0dd61ba03d05187726ecdf9c0e2175a81b9b24f6
  4. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <46da5c3ea011e884028a91cf913db093920a915b
  5. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <79235c8add5da4bf27a12f5a5dbb579f300c059e
  6. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <a504b9f2797b739e0304d537e8aa4ce883ecce39
  7. Affected versionversion=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <a770e62923090d7572f1f5a8507ae551d354a057

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.15; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <07cd2787cdf8942d24a1a3ef81aa89b526fb6381; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <0dd61ba03d05187726ecdf9c0e2175a81b9b24f6; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <46da5c3ea011e884028a91cf913db093920a915b; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <79235c8add5da4bf27a12f5a5dbb579f300c059e; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <a504b9f2797b739e0304d537e8aa4ce883ecce39; version=cdae7c07e3e3509eaabc18c1640a55dc5b99c179 <a770e62923090d7572f1f5a8507ae551d354a057

Published CVSS scores

8.1Linux CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
2.4UbuntuCVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
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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