CVE-2026-89963

Kernel panic via unchecked reserved-memory pointer

Published Sep 16, 2026 · Updated Sep 16, 2026

Null pointer dereference in Linux 6.11 allows attackers to panic the kernel through the powerpc kexec file-load path. When a platform has no reserved-memory ranges, get_reserved_memory_ranges() returns success without allocating rmem, but kexec_extra_fdt_size_ppc64() dereferences rmem->nr_ranges while sizing the crash-kernel device tree. Reachability requires a powerpc64 system with no reserved-memory regions and invocation of the kexec file-load path; public sources do not identify the required attacker privilege.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in Linux 6.11 allows attackers to panic the kernel through the powerpc kexec file-load path. When a platform has no reserved-memory ranges, get_reserved_memory_ranges() returns success without allocating rmem, but kexec_extra_fdt_size_ppc64() dereferences rmem->nr_ranges while sizing the crash-kernel device tree. Reachability requires a powerpc64 system with no reserved-memory regions and invocation of the kexec file-load path; public sources do not identify the required attacker privilege.

The record

CVE
CVE-2026-89963
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=0d3ff067331ef84e7e7f49537d768881042ed5ba <11ef1c2a5dbe0bd8c1345f59bab7331d352f02cf
  2. Affected versionversion=0d3ff067331ef84e7e7f49537d768881042ed5ba <4ff3d9fd71c7bc2fc81afdac1970d9c55a5c0dea
  3. Affected versionversion=0d3ff067331ef84e7e7f49537d768881042ed5ba <761eda315a6e1fda3e8e2185b28430771fb1ac29
  4. Affected versionversion=0d3ff067331ef84e7e7f49537d768881042ed5ba <df45337587db21c502fe5251d3bcc7887428f4fb
  5. Affected versionversion=6.11

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0d3ff067331ef84e7e7f49537d768881042ed5ba <11ef1c2a5dbe0bd8c1345f59bab7331d352f02cf; version=0d3ff067331ef84e7e7f49537d768881042ed5ba <4ff3d9fd71c7bc2fc81afdac1970d9c55a5c0dea; version=0d3ff067331ef84e7e7f49537d768881042ed5ba <761eda315a6e1fda3e8e2185b28430771fb1ac29; version=0d3ff067331ef84e7e7f49537d768881042ed5ba <df45337587db21c502fe5251d3bcc7887428f4fb; version=6.11

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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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