CVE-2022-50756

Kernel compromise via undersized PRP-list mempool

Published Dec 24, 2025 · Updated Dec 24, 2025

Out-of-bounds write in the nvme-pci host driver in Linux allows local users to corrupt kernel memory via crafted block I/O. The driver divides a page-count maximum by a byte-sized PRP-list capacity, allocates one list when two are required, and writes PRP pointers past the mempool object. Triggering requires large fragmented O_DIRECT I/O to an NVMe-backed filesystem on a controller queue without SGL support; consequences include kernel compromise or a crash.

CVSS severity7.8
High
EPSS probability0.20%
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 write in the nvme-pci host driver in Linux allows local users to corrupt kernel memory via crafted block I/O. The driver divides a page-count maximum by a byte-sized PRP-list capacity, allocates one list when two are required, and writes PRP pointers past the mempool object. Triggering requires large fragmented O_DIRECT I/O to an NVMe-backed filesystem on a controller queue without SGL support; consequences include kernel compromise or a crash.

The record

CVE
CVE-2022-50756
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.18
  2. Affected versionversion=943e942e6266f22babee5efeb00f8f672fbff5bd <9141144b37f30e3e7fa024bcfa0a13011e546ba9
  3. Affected versionversion=943e942e6266f22babee5efeb00f8f672fbff5bd <b1814724e0d7162bdf4799f2d565381bc2251c63
  4. Affected versionversion=943e942e6266f22babee5efeb00f8f672fbff5bd <c89a529e823d51dd23c7ec0c047c7a454a428541
  5. Affected versionversion=943e942e6266f22babee5efeb00f8f672fbff5bd <dfb6d54893d544151e7f480bc44cfe7823f5ad23
  6. Affected versionversion=943e942e6266f22babee5efeb00f8f672fbff5bd <e1777b4286e526c58b4ee699344b0ad85aaf83a0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.18; version=943e942e6266f22babee5efeb00f8f672fbff5bd <9141144b37f30e3e7fa024bcfa0a13011e546ba9; version=943e942e6266f22babee5efeb00f8f672fbff5bd <b1814724e0d7162bdf4799f2d565381bc2251c63; version=943e942e6266f22babee5efeb00f8f672fbff5bd <c89a529e823d51dd23c7ec0c047c7a454a428541; version=943e942e6266f22babee5efeb00f8f672fbff5bd <dfb6d54893d544151e7f480bc44cfe7823f5ad23; version=943e942e6266f22babee5efeb00f8f672fbff5bd <e1777b4286e526c58b4ee699344b0ad85aaf83a0

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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