CVE-2022-49720

Kernel out-of-bounds access via offline queue index

Published Feb 26, 2025 · Updated May 11, 2026

Improper array-index validation in Linux kernel 4.16 through 5.18.5 allows local users to read or write kernel memory or crash the host. When an NVMe-oF connection targets an offline hardware queue, blk_mq_alloc_request_hctx() accepts nr_cpu_ids from an empty online-CPU mask and passes it to __blk_mq_get_ctx(), indexing a per-CPU array beyond its bound. Reachability requires local access to initiate an NVMe-oF queue connection while every CPU mapped to that queue is offline.

CVSS severity7.8
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper array-index validation in Linux kernel 4.16 through 5.18.5 allows local users to read or write kernel memory or crash the host. When an NVMe-oF connection targets an offline hardware queue, blk_mq_alloc_request_hctx() accepts nr_cpu_ids from an empty online-CPU mask and passes it to __blk_mq_get_ctx(), indexing a per-CPU array beyond its bound. Reachability requires local access to initiate an NVMe-oF queue connection while every CPU mapped to that queue is offline.

The record

CVE
CVE-2022-49720
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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=20e4d813931961fe26d26a1e98b3aba6ec00b130 <14dc7a18abbe4176f5626c13c333670da8e06aa1
  2. Affected versionversion=20e4d813931961fe26d26a1e98b3aba6ec00b130 <7fa28a7c3d74933a4fc22d341b60927952f31c19
  3. Affected versionversion=20e4d813931961fe26d26a1e98b3aba6ec00b130 <b202a0bd2580ee5b0453772c46d464152fafff73
  4. Affected versionversion=20e4d813931961fe26d26a1e98b3aba6ec00b130 <b5e65ef044d627effdc2599040b6d204e003f955
  5. Affected versionversion=4.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=20e4d813931961fe26d26a1e98b3aba6ec00b130 <14dc7a18abbe4176f5626c13c333670da8e06aa1; version=20e4d813931961fe26d26a1e98b3aba6ec00b130 <7fa28a7c3d74933a4fc22d341b60927952f31c19; version=20e4d813931961fe26d26a1e98b3aba6ec00b130 <b202a0bd2580ee5b0453772c46d464152fafff73; version=20e4d813931961fe26d26a1e98b3aba6ec00b130 <b5e65ef044d627effdc2599040b6d204e003f955; version=4.16

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/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.

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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-129Improper Validation of Array Index
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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