CVE-2026-45922

Memory exhaustion via oversized sysfs-path requests

Published May 27, 2026 · Updated May 27, 2026

Memory leak in the RDMA/mlx5 sysfs-path handler in Linux Kernel allows local users to exhaust kernel memory through repeated calls. UVERBS_HANDLER(MLX5_IB_METHOD_GET_DATA_DIRECT_SYSFS_PATH) allocates a device path with kobject_get_path(), then returns ENOSPC without freeing it when the path exceeds the output buffer. Low-privilege local access and an mlx5 RDMA device are required; repeated triggering consumes kernel memory and can interrupt service.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the RDMA/mlx5 sysfs-path handler in Linux Kernel allows local users to exhaust kernel memory through repeated calls. UVERBS_HANDLER(MLX5_IB_METHOD_GET_DATA_DIRECT_SYSFS_PATH) allocates a device path with kobject_get_path(), then returns ENOSPC without freeing it when the path exceeds the output buffer. Low-privilege local access and an mlx5 RDMA device are required; repeated triggering consumes kernel memory and can interrupt service.

The record

CVE
CVE-2026-45922
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=6.12
  2. Affected versionversion=ec7ad6530909983c8736c80af46e3529ce7bab55 <9b9d253908478f504297ac283c514e5953ddafa6
  3. Affected versionversion=ec7ad6530909983c8736c80af46e3529ce7bab55 <b2bc649c18fbe8a7fd38d17266da3dcbfbcc44d2
  4. Affected versionversion=ec7ad6530909983c8736c80af46e3529ce7bab55 <b3a10eca24fcfe913c0875e620f19596001bd6dc
  5. Affected versionversion=ec7ad6530909983c8736c80af46e3529ce7bab55 <ee998cdbff6680891b0efd9d6ce53a388e5342c3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=ec7ad6530909983c8736c80af46e3529ce7bab55 <9b9d253908478f504297ac283c514e5953ddafa6; version=ec7ad6530909983c8736c80af46e3529ce7bab55 <b2bc649c18fbe8a7fd38d17266da3dcbfbcc44d2; version=ec7ad6530909983c8736c80af46e3529ce7bab55 <b3a10eca24fcfe913c0875e620f19596001bd6dc; version=ec7ad6530909983c8736c80af46e3529ce7bab55 <ee998cdbff6680891b0efd9d6ce53a388e5342c3

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

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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