CVE-2026-80589Network attack vector

Kernel memory corruption via dangling timeout timer

Published Aug 26, 2026 · Updated Aug 26, 2026

Use-after-free in the Linux kernel block layer allows remote attackers to corrupt kernel memory through crafted NVMe-oF responses. disk_release() frees a request_queue after a pre-add_disk probe failure without stopping q->timeout, leaving its timer-wheel entry to access freed memory. An attacker must control an established NVMe fabric endpoint and induce namespace I/O plus probe failure; consequences include kernel disclosure, arbitrary writes, or a panic.

CVSS severity9.8
Critical
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel block layer allows remote attackers to corrupt kernel memory through crafted NVMe-oF responses. disk_release() frees a request_queue after a pre-add_disk probe failure without stopping q->timeout, leaving its timer-wheel entry to access freed memory. An attacker must control an established NVMe fabric endpoint and induce namespace I/O plus probe failure; consequences include kernel disclosure, arbitrary writes, or a panic.

The record

CVE
CVE-2026-80589
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-825, CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=5.19.12 <5.20
  2. Affected versionversion=6.0
  3. Affected versionversion=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <1a0ae4d502062a2759f2a92d12bdeab3c64c7372
  4. Affected versionversion=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <26cb8ebbfaf713c82e142d08828d4d765057633b
  5. Affected versionversion=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <6ae7364f68e6c7af6b6df4bbb14040b89e5975d0
  6. Affected versionversion=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <6f06dbe5012c160e0dba418a5a9cb16c456ad46a
  7. Affected versionversion=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <93d620519d71dfc6ee64b5baea74f1d85d4439fb
  8. Affected versionversion=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <bb03b56d1d754908a37a160603be21769da423cf
  9. Affected versionversion=d27b66257db183fe11c10f31246ae965adb005d3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19.12 <5.20; version=6.0; version=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <1a0ae4d502062a2759f2a92d12bdeab3c64c7372; version=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <26cb8ebbfaf713c82e142d08828d4d765057633b; version=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <6ae7364f68e6c7af6b6df4bbb14040b89e5975d0; version=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <6f06dbe5012c160e0dba418a5a9cb16c456ad46a; version=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <93d620519d71dfc6ee64b5baea74f1d85d4439fb; version=6f8191fdf41d3a53cc1d63fe2234e812c55a0092 <bb03b56d1d754908a37a160603be21769da423cf; version=d27b66257db183fe11c10f31246ae965adb005d3

Published CVSS scores

7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.3Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
9.8Linux CNACVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
CWE-416Use After Free
T1499Endpoint Denial of Service

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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