CVE-2026-89483Public exploit

Kernel-memory disclosure via uninitialized discard payload

Published Sep 11, 2026 · Updated Sep 11, 2026

Information disclosure in the Linux NVMe host driver allows attackers to send uninitialized kernel memory to a controller through a discard request. nvme_setup_discard() maps a 4,096-byte DSM payload but initializes only the declared ranges after its atomic allocation fails because the per-controller fallback page is allocated without zeroing. Triggering the leak requires local discard activity during memory pressure, and the exposed tail can contain prior kernel-page data such as vmemmap pointers.

CVSS severityUnavailable
Unscored
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux NVMe host driver allows attackers to send uninitialized kernel memory to a controller through a discard request. nvme_setup_discard() maps a 4,096-byte DSM payload but initializes only the declared ranges after its atomic allocation fails because the per-controller fallback page is allocated without zeroing. Triggering the leak requires local discard activity during memory pressure, and the exposed tail can contain prior kernel-page data such as vmemmap pointers.

The record

CVE
CVE-2026-89483
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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=4.19.92 <4.20
  2. Affected versionversion=530436c45ef2e446c12538a400e465929a0b3ade <67551d8430df94c827e1830bd3a5fae1f66a5219
  3. Affected versionversion=530436c45ef2e446c12538a400e465929a0b3ade <bededeaaeff404978a5a8e2a605a6c3017cddd3e
  4. Affected versionversion=530436c45ef2e446c12538a400e465929a0b3ade <dc4d4b70a863f7e39ef8bd137634be4e6db8b084
  5. Affected versionversion=530436c45ef2e446c12538a400e465929a0b3ade <f5827817b4fc7feeabf4f53fb4b626e6edc52fef
  6. Affected versionversion=5.4.7 <5.5
  7. Affected versionversion=5.5
  8. Affected versionversion=8b0acb768a06083b0d28bace1481c1f6679e76f4
  9. Affected versionversion=ffa56cbdd2409b522b4cb56461bea1c45889417b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.19.92 <4.20; version=530436c45ef2e446c12538a400e465929a0b3ade <67551d8430df94c827e1830bd3a5fae1f66a5219; version=530436c45ef2e446c12538a400e465929a0b3ade <bededeaaeff404978a5a8e2a605a6c3017cddd3e; version=530436c45ef2e446c12538a400e465929a0b3ade <dc4d4b70a863f7e39ef8bd137634be4e6db8b084; version=530436c45ef2e446c12538a400e465929a0b3ade <f5827817b4fc7feeabf4f53fb4b626e6edc52fef; version=5.4.7 <5.5; version=5.5; version=8b0acb768a06083b0d28bace1481c1f6679e76f4; version=ffa56cbdd2409b522b4cb56461bea1c45889417b

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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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