CVE-2024-26745

LPAR crash via uninitialized IOMMU table

Published Apr 4, 2024 · Updated May 23, 2026

NULL pointer dereference in affected Linux kernel versions allows local users to crash a PowerPC pSeries LPAR during kdump over SR-IOV. iommu_table_setparms_lpar() considers only the absent ibm,dma-window property, leaving a dynamically mapped DDW table uninitialized before iommu_area_alloc() reads through it. Reachability requires administrative control of kdump on a pSeries LPAR with an SR-IOV device and a dynamic DDW; the panic interrupts crash-dump collection.

CVSS severity4.4
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in affected Linux kernel versions allows local users to crash a PowerPC pSeries LPAR during kdump over SR-IOV. iommu_table_setparms_lpar() considers only the absent ibm,dma-window property, leaving a dynamically mapped DDW table uninitialized before iommu_area_alloc() reads through it. Reachability requires administrative control of kdump on a pSeries LPAR with an SR-IOV device and a dynamic DDW; the panic interrupts crash-dump collection.

The record

CVE
CVE-2024-26745
Published
Apr 4, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 4, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=5.18.18 <5.19
  2. Affected versionversion=5.19.2 <5.20
  3. Affected versionversion=58942f672c6d04b6a3cd7866cb459671df881538
  4. Affected versionversion=6.0
  5. Affected versionversion=b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d <09a3c1e46142199adcee372a420b024b4fc61051
  6. Affected versionversion=b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d <5da6d306f315344af1ca2eff4bd9b10b130f0c28
  7. Affected versionversion=b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d <7eb95e0af5c9c2e6fad50356eaf32d216d0e7bc3
  8. Affected versionversion=b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d <d4d1e4b1513d975961de7bb4f75e450a92d65ebf
  9. Affected versionversion=b9f08b2649dddd4eb0698cb428b173bb01dd2fc5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=5.18.18 <5.19; version=5.19.2 <5.20; version=58942f672c6d04b6a3cd7866cb459671df881538; version=6.0; version=b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d <09a3c1e46142199adcee372a420b024b4fc61051; version=b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d <5da6d306f315344af1ca2eff4bd9b10b130f0c28; version=b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d <7eb95e0af5c9c2e6fad50356eaf32d216d0e7bc3; version=b1fc44eaa9ba31e28c4125d6b9205a3582b47b5d <d4d1e4b1513d975961de7bb4f75e450a92d65ebf; version=b9f08b2649dddd4eb0698cb428b173bb01dd2fc5

Published CVSS scores

4.4CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/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.

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No observations available

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

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

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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