CVE-2026-53133

Memory disclosure and corruption via DMA truncation

Published Jun 25, 2026 · Updated Jun 25, 2026

Numeric truncation in the RDMA/umem component of Linux Kernel allows local users to expose or corrupt unintended memory through DMA mappings. __rdma_block_iter_next() reassembles IOMMU-linearized scatter-gather entries with 32-bit stack values, truncating blocks of at least 4 GB and calculating incorrect DMA addresses. Exploitation requires local access to an RDMA uverbs device on an IOMMU-backed deployment; crafted memory registration can disclose or overwrite unintended mapped memory or interrupt RDMA operations.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Numeric truncation in the RDMA/umem component of Linux Kernel allows local users to expose or corrupt unintended memory through DMA mappings. __rdma_block_iter_next() reassembles IOMMU-linearized scatter-gather entries with 32-bit stack values, truncating blocks of at least 4 GB and calculating incorrect DMA addresses. Exploitation requires local access to an RDMA uverbs device on an IOMMU-backed deployment; crafted memory registration can disclose or overwrite unintended mapped memory or interrupt RDMA operations.

The record

CVE
CVE-2026-53133
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-681, T1068
Attack vector
local
Privileges
authenticated

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=5.2
  2. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <15fe76e23615f502d051ef0768f86babaf08746c
  3. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <2ff4b7817e5b78070c30f5fb5e678e452a2628b3
  4. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <8fe0231adebe086c8a459c790944ac026cd99c6e
  5. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <ac1aad8e1281534ce936c250f68084fc79c5469e
  6. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <afd35fec9297195b759078745549c2671223f24f
  7. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <baf8685bcf56dc1efb44b8f6a57c42516e549068
  8. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f
  9. Affected versionversion=a808273a495c657e33281b181fd7fcc2bb28f662 <dee2a49adeeb2a5e16a3fc858fa21b841c519802

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.2; version=a808273a495c657e33281b181fd7fcc2bb28f662 <15fe76e23615f502d051ef0768f86babaf08746c; version=a808273a495c657e33281b181fd7fcc2bb28f662 <2ff4b7817e5b78070c30f5fb5e678e452a2628b3; version=a808273a495c657e33281b181fd7fcc2bb28f662 <8fe0231adebe086c8a459c790944ac026cd99c6e; version=a808273a495c657e33281b181fd7fcc2bb28f662 <ac1aad8e1281534ce936c250f68084fc79c5469e; version=a808273a495c657e33281b181fd7fcc2bb28f662 <afd35fec9297195b759078745549c2671223f24f; version=a808273a495c657e33281b181fd7fcc2bb28f662 <baf8685bcf56dc1efb44b8f6a57c42516e549068; version=a808273a495c657e33281b181fd7fcc2bb28f662 <cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f; version=a808273a495c657e33281b181fd7fcc2bb28f662 <dee2a49adeeb2a5e16a3fc858fa21b841c519802

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-681Incorrect Conversion between Numeric Types
T1068Exploitation for Privilege Escalation

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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