CVE-2026-52968

Host memory corruption via double-scaled GAIT indexing

Published Jun 24, 2026 · Updated Jun 24, 2026

Out-of-bounds access in affected Linux Kernel releases allows local users to corrupt host memory through KVM s390 zPCI operations. The kvm_s390_pci_aif_enable(), kvm_s390_pci_aif_disable(), and aen_host_forward() paths multiply an already typed GAIT pointer index by the entry size, selecting aisb*16 instead of aisb. Exploitation requires local control of a KVM guest with an assigned VFIO zPCI device and an AISB index of at least 32; resulting out-of-bounds accesses disclose or corrupt host kernel memory and crash the host.

CVSS severity8.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in affected Linux Kernel releases allows local users to corrupt host memory through KVM s390 zPCI operations. The kvm_s390_pci_aif_enable(), kvm_s390_pci_aif_disable(), and aen_host_forward() paths multiply an already typed GAIT pointer index by the entry size, selecting aisb*16 instead of aisb. Exploitation requires local control of a KVM guest with an assigned VFIO zPCI device and an AISB index of at least 32; resulting out-of-bounds accesses disclose or corrupt host kernel memory and crash the host.

The record

CVE
CVE-2026-52968
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=6.0
  2. Affected versionversion=73f91b004321f2510fa79e66035dbbf1870fcf56 <11b8ff5b930b351dd1f6f088dce0beb027ac92d0
  3. Affected versionversion=73f91b004321f2510fa79e66035dbbf1870fcf56 <16d990a15491cf76cd6eef0846e1b4100e63261a
  4. Affected versionversion=73f91b004321f2510fa79e66035dbbf1870fcf56 <31a9d9f9942885aae356a1a57c79e82c5b5b0828
  5. Affected versionversion=73f91b004321f2510fa79e66035dbbf1870fcf56 <a99a25db131ece5e6c0f7632da606de631efe4f2
  6. Affected versionversion=73f91b004321f2510fa79e66035dbbf1870fcf56 <b22a2da8792a7bfe743c1a922e77fa499ddedbe8
  7. Affected versionversion=73f91b004321f2510fa79e66035dbbf1870fcf56 <e7216651b94e92e5433fb2f54b77864642b4ea48

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=73f91b004321f2510fa79e66035dbbf1870fcf56 <11b8ff5b930b351dd1f6f088dce0beb027ac92d0; version=73f91b004321f2510fa79e66035dbbf1870fcf56 <16d990a15491cf76cd6eef0846e1b4100e63261a; version=73f91b004321f2510fa79e66035dbbf1870fcf56 <31a9d9f9942885aae356a1a57c79e82c5b5b0828; version=73f91b004321f2510fa79e66035dbbf1870fcf56 <a99a25db131ece5e6c0f7632da606de631efe4f2; version=73f91b004321f2510fa79e66035dbbf1870fcf56 <b22a2da8792a7bfe743c1a922e77fa499ddedbe8; version=73f91b004321f2510fa79e66035dbbf1870fcf56 <e7216651b94e92e5433fb2f54b77864642b4ea48

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

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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