CVE-2022-50093

Kernel memory disclosure via unchecked NUMA node index

Published Jun 18, 2025 · Updated May 11, 2026

Out-of-bounds read in affected Linux kernel releases allows local users to disclose kernel memory or crash the system during Intel VT-d startup. The dmar_parse_one_rhsa path passes NUMA_NO_NODE from pxm_to_node into node_online, where -1 becomes ULONG_MAX and indexes the node mask outside its bounds. Reachability requires Intel VT-d RHSA parsing when no valid NUMA node is returned, such as during boot with ACPI NUMA disabled; no attacker-controlled trigger is documented.

CVSS severity7.1
High
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

Out-of-bounds read in affected Linux kernel releases allows local users to disclose kernel memory or crash the system during Intel VT-d startup. The dmar_parse_one_rhsa path passes NUMA_NO_NODE from pxm_to_node into node_online, where -1 becomes ULONG_MAX and indexes the node mask outside its bounds. Reachability requires Intel VT-d RHSA parsing when no valid NUMA node is returned, such as during boot with ACPI NUMA disabled; no attacker-controlled trigger is documented.

The record

CVE
CVE-2022-50093
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=2.6.33
  2. Affected versionversion=ee34b32d8c2950f66038c8975747ef9aec855289 <0b4c0003aeda32a600f95df53b2848da8a5aa3fa
  3. Affected versionversion=ee34b32d8c2950f66038c8975747ef9aec855289 <5659efdadf04b56707d58c1b758df16d2e0eff2c
  4. Affected versionversion=ee34b32d8c2950f66038c8975747ef9aec855289 <73ce2046e04ad488cecc66757c36cbe1bdf089d4
  5. Affected versionversion=ee34b32d8c2950f66038c8975747ef9aec855289 <b0b0b77ea611e3088e9523e60860f4f41b62b235
  6. Affected versionversion=ee34b32d8c2950f66038c8975747ef9aec855289 <b12304984654d8e58a2b22ff94c4410906d6267f
  7. Affected versionversion=ee34b32d8c2950f66038c8975747ef9aec855289 <c2304c50f4d94f56c2e326f25c9dc8cf2ba6f5fa

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=ee34b32d8c2950f66038c8975747ef9aec855289 <0b4c0003aeda32a600f95df53b2848da8a5aa3fa; version=ee34b32d8c2950f66038c8975747ef9aec855289 <5659efdadf04b56707d58c1b758df16d2e0eff2c; version=ee34b32d8c2950f66038c8975747ef9aec855289 <73ce2046e04ad488cecc66757c36cbe1bdf089d4; version=ee34b32d8c2950f66038c8975747ef9aec855289 <b0b0b77ea611e3088e9523e60860f4f41b62b235; version=ee34b32d8c2950f66038c8975747ef9aec855289 <b12304984654d8e58a2b22ff94c4410906d6267f; version=ee34b32d8c2950f66038c8975747ef9aec855289 <c2304c50f4d94f56c2e326f25c9dc8cf2ba6f5fa

Published CVSS scores

7.1Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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-125Out-of-bounds Read

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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