CVE-2026-68454

Guest-to-host compromise via bogus AISB address

Published Aug 13, 2026 · Updated Aug 13, 2026

Memory corruption in KVM s390 PCI in Linux allows guest OS users to compromise the host via adapter IRQ registration. A missing summary-bit value makes the IRQ-registration path store a physical address derived from a null page pointer in the GAITE, enabling wild host-memory accesses during interrupt forwarding or teardown. Control of a guest with an assigned zPCI device is required; resulting host-memory disclosure, corruption, control-flow hijacking, or a kernel panic can affect the hypervisor and its guests.

CVSS severity8.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in KVM s390 PCI in Linux allows guest OS users to compromise the host via adapter IRQ registration. A missing summary-bit value makes the IRQ-registration path store a physical address derived from a null page pointer in the GAITE, enabling wild host-memory accesses during interrupt forwarding or teardown. Control of a guest with an assigned zPCI device is required; resulting host-memory disclosure, corruption, control-flow hijacking, or a kernel panic can affect the hypervisor and its guests.

The record

CVE
CVE-2026-68454
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <124a3769c43713a11a93a821b313e61ad5110cb8
  2. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <3e3aa6da87d30a0064a17b836685cd43c90a3572
  3. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <3ef3190e30601b2688bdc64169b938b8d7f42010
  4. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <d48b9b096d11e31690c0a4988f65f21b64c01b2a
  5. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <df72596278b0e22dac5ef2881e9221a3a2c4ed11
  6. Affected versionversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <f887df91826e72b570c5e9298e66dd929f09edde
  7. Affected versionversion=6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <124a3769c43713a11a93a821b313e61ad5110cb8; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <3e3aa6da87d30a0064a17b836685cd43c90a3572; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <3ef3190e30601b2688bdc64169b938b8d7f42010; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <d48b9b096d11e31690c0a4988f65f21b64c01b2a; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <df72596278b0e22dac5ef2881e9221a3a2c4ed11; version=3c5a1b6f0a18520a0edd0600fef6f1a8553b8fdc <f887df91826e72b570c5e9298e66dd929f09edde; version=6.0

Published CVSS scores

8.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-476NULL Pointer Dereference
T1068Exploitation for Privilege Escalation

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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