CVE-2026-90388

Unspecified impact via unchecked page allocation

Published Sep 17, 2026 · Updated Sep 18, 2026

Allocation failure handling in Linux 5.8.6 and 5.9 through affected stable branches allows attackers to cause unspecified impact. In iommu_dma_alloc, the non-blocking, non-coherent path tests cpu_addr instead of the page returned by dma_alloc_from_pool, then passes a failed page allocation to IOMMU mapping. Reachability requires CONFIG_DMA_DIRECT_REMAP, a non-blocking allocation for a non-coherent device, and allocation failure; the Linux kernel CVE team has not published a resulting impact.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Allocation failure handling in Linux 5.8.6 and 5.9 through affected stable branches allows attackers to cause unspecified impact. In iommu_dma_alloc, the non-blocking, non-coherent path tests cpu_addr instead of the page returned by dma_alloc_from_pool, then passes a failed page allocation to IOMMU mapping. Reachability requires CONFIG_DMA_DIRECT_REMAP, a non-blocking allocation for a non-coherent device, and allocation failure; the Linux kernel CVE team has not published a resulting impact.

The record

CVE
CVE-2026-90388
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=47184b9ddf184cc9a77cf441943a0fe9b7afa575
  2. Affected versionversion=5.8.6 <5.9
  3. Affected versionversion=5.9
  4. Affected versionversion=9420139f516d7fbc248ce17f35275cb005ed98ea <06dffc96693083dda3412311406e558cf27f1574
  5. Affected versionversion=9420139f516d7fbc248ce17f35275cb005ed98ea <8c486293ddd0af60991408149fc3e964ea888dc4
  6. Affected versionversion=9420139f516d7fbc248ce17f35275cb005ed98ea <a4ace31d732b657d774e31fb444c0c27d42c78e5
  7. Affected versionversion=9420139f516d7fbc248ce17f35275cb005ed98ea <ac9cd0a669b8be5d178dbd471b0d68039dac58b5
  8. Affected versionversion=9420139f516d7fbc248ce17f35275cb005ed98ea <af95a0ebc0a0db0762be75f51eadf770bad01aaa
  9. Affected versionversion=9420139f516d7fbc248ce17f35275cb005ed98ea <d56c3f955b21e5764c1497e295a5b5d0b3a40470
  10. Affected versionversion=9420139f516d7fbc248ce17f35275cb005ed98ea <db46cb9da83a507d86d2bb080bdb09c865da3d0a
  11. Affected versionversion=9420139f516d7fbc248ce17f35275cb005ed98ea <fb0b39287ba894dbdfac2901c51788b63f5c2291

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=47184b9ddf184cc9a77cf441943a0fe9b7afa575; version=5.8.6 <5.9; version=5.9; version=9420139f516d7fbc248ce17f35275cb005ed98ea <06dffc96693083dda3412311406e558cf27f1574; version=9420139f516d7fbc248ce17f35275cb005ed98ea <8c486293ddd0af60991408149fc3e964ea888dc4; version=9420139f516d7fbc248ce17f35275cb005ed98ea <a4ace31d732b657d774e31fb444c0c27d42c78e5; version=9420139f516d7fbc248ce17f35275cb005ed98ea <ac9cd0a669b8be5d178dbd471b0d68039dac58b5; version=9420139f516d7fbc248ce17f35275cb005ed98ea <af95a0ebc0a0db0762be75f51eadf770bad01aaa; version=9420139f516d7fbc248ce17f35275cb005ed98ea <d56c3f955b21e5764c1497e295a5b5d0b3a40470; version=9420139f516d7fbc248ce17f35275cb005ed98ea <db46cb9da83a507d86d2bb080bdb09c865da3d0a; version=9420139f516d7fbc248ce17f35275cb005ed98ea <fb0b39287ba894dbdfac2901c51788b63f5c2291

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

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)
VectorUnavailable
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.

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Technologies

Your stack

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Your stack

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