CVE-2022-50775

Local resource exhaustion via missing mmap release

Published Dec 24, 2025 · Updated Dec 24, 2025

Resource leakage in Linux kernel 5.17 allows local users to retain HNS RDMA mmap entry references through mapping requests. The hns_roce_mmap path acquires an entry through rdma_user_mmap_entry_get_pgoff() but omits the matching rdma_user_mmap_entry_put(). Access to an HNS RDMA device is required; repeated mappings consume unreleased references, but the terminal failure mode is undisclosed.

CVSS severity4.7
Medium
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

Resource leakage in Linux kernel 5.17 allows local users to retain HNS RDMA mmap entry references through mapping requests. The hns_roce_mmap path acquires an entry through rdma_user_mmap_entry_get_pgoff() but omits the matching rdma_user_mmap_entry_put(). Access to an HNS RDMA device is required; repeated mappings consume unreleased references, but the terminal failure mode is undisclosed.

The record

CVE
CVE-2022-50775
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 2025Record 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=0045e0d3f42ed7d05434bb5bc16acfc793ea4891 <8abd2ff2256a2a99c11c7ecdcb5512429933620f
  2. Affected versionversion=0045e0d3f42ed7d05434bb5bc16acfc793ea4891 <cf6a05c8494a8ae7fec8e5f1229b45ca5b4bcd30
  3. Affected versionversion=0045e0d3f42ed7d05434bb5bc16acfc793ea4891 <fa87cf2e756efe809ee8683d4f282f4de962dab6
  4. Affected versionversion=5.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0045e0d3f42ed7d05434bb5bc16acfc793ea4891 <8abd2ff2256a2a99c11c7ecdcb5512429933620f; version=0045e0d3f42ed7d05434bb5bc16acfc793ea4891 <cf6a05c8494a8ae7fec8e5f1229b45ca5b4bcd30; version=0045e0d3f42ed7d05434bb5bc16acfc793ea4891 <fa87cf2e756efe809ee8683d4f282f4de962dab6; version=5.17

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/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

T1499.004Application or System Exploitation

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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