CVE-2026-98593

Kernel crash via unchecked debug-area copy

Published Oct 18, 2026 · Updated Oct 18, 2026

NULL dereference in Linux s390 debug handling allows local users to crash the kernel by opening a failed debug area's view. After debug_register_static() clears area pointers but retains their bounds, debug_info_copy() loops over those bounds without checking whether the source areas exist. The trigger requires a prior registration failure and access to the affected view file or a kernel caller of debug_dump(); required privileges are not specified.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL dereference in Linux s390 debug handling allows local users to crash the kernel by opening a failed debug area's view. After debug_register_static() clears area pointers but retains their bounds, debug_info_copy() loops over those bounds without checking whether the source areas exist. The trigger requires a prior registration failure and access to the affected view file or a kernel caller of debug_dump(); required privileges are not specified.

The record

CVE
CVE-2026-98593
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=5.15
  2. Affected versionversion=d72541f945127b4873dace501406a1bc8cd8e1e9 <012bfcd5a51082d5a65f096dfb9ca652b5267965
  3. Affected versionversion=d72541f945127b4873dace501406a1bc8cd8e1e9 <13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225
  4. Affected versionversion=d72541f945127b4873dace501406a1bc8cd8e1e9 <2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b
  5. Affected versionversion=d72541f945127b4873dace501406a1bc8cd8e1e9 <33f706884821da9cb55b650b7b1d4f2bdf800137
  6. Affected versionversion=d72541f945127b4873dace501406a1bc8cd8e1e9 <9c6af88fbefbe77608b77409df23a1617e28398c
  7. Affected versionversion=d72541f945127b4873dace501406a1bc8cd8e1e9 <a19bede30f0da5ae56782edac62b5998a7434cba
  8. Affected versionversion=d72541f945127b4873dace501406a1bc8cd8e1e9 <c593f38e1cdb92f87d01be4c4e5ac12417b1454b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=d72541f945127b4873dace501406a1bc8cd8e1e9 <012bfcd5a51082d5a65f096dfb9ca652b5267965; version=d72541f945127b4873dace501406a1bc8cd8e1e9 <13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225; version=d72541f945127b4873dace501406a1bc8cd8e1e9 <2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b; version=d72541f945127b4873dace501406a1bc8cd8e1e9 <33f706884821da9cb55b650b7b1d4f2bdf800137; version=d72541f945127b4873dace501406a1bc8cd8e1e9 <9c6af88fbefbe77608b77409df23a1617e28398c; version=d72541f945127b4873dace501406a1bc8cd8e1e9 <a19bede30f0da5ae56782edac62b5998a7434cba; version=d72541f945127b4873dace501406a1bc8cd8e1e9 <c593f38e1cdb92f87d01be4c4e5ac12417b1454b

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.

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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