CVE-2026-90322Hinoki check available

Kernel memory-safety fault via unstable heartbeat node index

Published Sep 17, 2026 · Updated Sep 17, 2026

Out-of-bounds access in Linux OCFS2 allows local users to trigger a kernel memory-safety fault by resetting the local node. o2nm_node_local_store() invalidates the node number but leaves cl_has_local set, while o2hb_do_disk_heartbeat() dynamically rereads the node and uses invalid index 255. The trigger requires privileged local configuration access while disk heartbeat threads remain active; validation establishes an out-of-bounds access, not a specific crash mode or code execution.

CVSS severity5.6
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds access in Linux OCFS2 allows local users to trigger a kernel memory-safety fault by resetting the local node. o2nm_node_local_store() invalidates the node number but leaves cl_has_local set, while o2hb_do_disk_heartbeat() dynamically rereads the node and uses invalid index 255. The trigger requires privileged local configuration access while disk heartbeat threads remain active; validation establishes an out-of-bounds access, not a specific crash mode or code execution.

The record

CVE
CVE-2026-90322
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=2.6.16
  2. Affected versionversion=a7f6a5fb4bde142b622706e2006ba33f793e13ed <688bc88e2046dd6ce81ce18079b5254cb8dadc0e
  3. Affected versionversion=a7f6a5fb4bde142b622706e2006ba33f793e13ed <70d7bb7a0be033e5ebe8a2c48974692b1318891c
  4. Affected versionversion=a7f6a5fb4bde142b622706e2006ba33f793e13ed <8abb2b7c60d2b2c0f40606048c873096c03874d2
  5. Affected versionversion=a7f6a5fb4bde142b622706e2006ba33f793e13ed <8e5cb90f212fda9f6cd29915a1ed74353108ceb3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.16; version=a7f6a5fb4bde142b622706e2006ba33f793e13ed <688bc88e2046dd6ce81ce18079b5254cb8dadc0e; version=a7f6a5fb4bde142b622706e2006ba33f793e13ed <70d7bb7a0be033e5ebe8a2c48974692b1318891c; version=a7f6a5fb4bde142b622706e2006ba33f793e13ed <8abb2b7c60d2b2c0f40606048c873096c03874d2; version=a7f6a5fb4bde142b622706e2006ba33f793e13ed <8e5cb90f212fda9f6cd29915a1ed74353108ceb3

Published CVSS scores

5.6Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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