CVE-2026-53188

Local RDMA validation bypass via device aliasing

Published Jun 25, 2026 · Updated Jun 25, 2026

Improper device validation in Linux Kernel 6.15 allows local users to bypass RDMA UCAP descriptor checks through device aliasing. In drivers/infiniband/core/ucaps.c, ib_get_ucaps() compares only the supplied descriptor's device number and fails to verify that its file operations belong to the expected character device. Exploitation requires local access and a block-device descriptor with the same dev_t, which the kernel then accepts as an authentic UCAP device.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper device validation in Linux Kernel 6.15 allows local users to bypass RDMA UCAP descriptor checks through device aliasing. In drivers/infiniband/core/ucaps.c, ib_get_ucaps() compares only the supplied descriptor's device number and fails to verify that its file operations belong to the expected character device. Exploitation requires local access and a block-device descriptor with the same dev_t, which the kernel then accepts as an authentic UCAP device.

The record

CVE
CVE-2026-53188
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
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=6.15
  2. Affected versionversion=61e51682816d395307f78ae06d640089054c28ab <4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee
  3. Affected versionversion=61e51682816d395307f78ae06d640089054c28ab <96b6e98ff12d50ed5817230c6f1188e1150d225d
  4. Affected versionversion=61e51682816d395307f78ae06d640089054c28ab <aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.15; version=61e51682816d395307f78ae06d640089054c28ab <4a1b1ac2744694a2ecd66a84bdb1445f4ef24bee; version=61e51682816d395307f78ae06d640089054c28ab <96b6e98ff12d50ed5817230c6f1188e1150d225d; version=61e51682816d395307f78ae06d640089054c28ab <aa181287ebdcc53ee0ba5c2f8243e2d541ebc19b

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

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

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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