CVE-2026-43449

Kernel memory disclosure and service interruption via overread

Published May 8, 2026 · Updated May 8, 2026

Out-of-bounds read in the Linux Kernel NVMe PCI driver allows local users to disclose kernel memory or interrupt service during reset. nvme_dbbuf_set iterates through dev->online_queues inclusively even though it is a count, so the final iteration passes an invalid queue index to nvme_dbbuf_free and reads beyond the allocation. Reachability requires local low-privileged access and an NVMe PCI device using doorbell buffers while the reset work queue reinitializes queues.

CVSS severity7.1
High
EPSS probability0.13%
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 the Linux Kernel NVMe PCI driver allows local users to disclose kernel memory or interrupt service during reset. nvme_dbbuf_set iterates through dev->online_queues inclusively even though it is a count, so the final iteration passes an invalid queue index to nvme_dbbuf_free and reads beyond the allocation. Reachability requires local low-privileged access and an NVMe PCI device using doorbell buffers while the reset work queue reinitializes queues.

The record

CVE
CVE-2026-43449
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, CAPEC-540, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record 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=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <2b9d605c3f0d3262142f196249cd3bd58c857c71
  2. Affected versionversion=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <328c551f0cc81ee776b186b86cc6e5253bb6fda7
  3. Affected versionversion=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <50bad78f03a02d3c0f228edf9912b494d3e7acb9
  4. Affected versionversion=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <78279d2d74c58a0ed64e43cf601a02649771182e
  5. Affected versionversion=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <83e6edd6358326c9c2de31a54bb4a1ec50703f1f
  6. Affected versionversion=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <86183d550559e45e07059bbdf17331fea469e38c
  7. Affected versionversion=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <b4e78f1427c7d6859229ae9616df54e1fc05a516
  8. Affected versionversion=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <d7990c936e25f484b61a5adeeadc1d290a9fd16e
  9. Affected versionversion=4940816604e3ce7e05e8df297773ee86c0476d48
  10. Affected versionversion=5.10
  11. Affected versionversion=55a3b1ad694631cc2698b5500ac5865d7d0f064e
  12. Affected versionversion=930bb3092fe606baa23d57ae59b70b291d67a8af
  13. Affected versionversion=fd1c1de8c4589fdd528733bfd01ed0c5f3f69204

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <2b9d605c3f0d3262142f196249cd3bd58c857c71; version=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <328c551f0cc81ee776b186b86cc6e5253bb6fda7; version=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <50bad78f03a02d3c0f228edf9912b494d3e7acb9; version=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <78279d2d74c58a0ed64e43cf601a02649771182e; version=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <83e6edd6358326c9c2de31a54bb4a1ec50703f1f; version=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <86183d550559e45e07059bbdf17331fea469e38c; version=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <b4e78f1427c7d6859229ae9616df54e1fc05a516; version=0f0d2c876c96d4908a9ef40959a44bec21bdd6cf <d7990c936e25f484b61a5adeeadc1d290a9fd16e; version=4940816604e3ce7e05e8df297773ee86c0476d48; version=5.10; version=55a3b1ad694631cc2698b5500ac5865d7d0f064e; version=930bb3092fe606baa23d57ae59b70b291d67a8af; version=fd1c1de8c4589fdd528733bfd01ed0c5f3f69204

Published CVSS scores

7.1NIST NVDCVSS: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.

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

CWE-125Out-of-bounds Read
CAPEC-540Overread Buffers
T1005Data from Local System

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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