CVE-2026-80549

Host compromise via asynchronous vfio-ccw cleanup race

Published Aug 26, 2026 · Updated Aug 27, 2026

A cleanup race in Linux kernel 6.0 through affected 7.1 releases allows local users with privileged VFIO access to compromise the host. The s390 vfio-ccw fsm_notoper() path calls cp_free() synchronously during an asynchronous not-operational transition while the CIO subchannel lock may be held, enabling deadlock or concurrent teardown of live channel-program metadata. Reachability requires an s390 host, an administrator-configured vfio-ccw mediated device, and CAP_SYS_ADMIN-level VFIO/IOMMU access; consequences include kernel hang, panic, memory disclosure, and kernel-state corruption.

CVSS severity8.2
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

A cleanup race in Linux kernel 6.0 through affected 7.1 releases allows local users with privileged VFIO access to compromise the host. The s390 vfio-ccw fsm_notoper() path calls cp_free() synchronously during an asynchronous not-operational transition while the CIO subchannel lock may be held, enabling deadlock or concurrent teardown of live channel-program metadata. Reachability requires an s390 host, an administrator-configured vfio-ccw mediated device, and CAP_SYS_ADMIN-level VFIO/IOMMU access; consequences include kernel hang, panic, memory disclosure, and kernel-state corruption.

The record

CVE
CVE-2026-80549
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=204b394a23ad5e30944f23518e21e844614da2ff <0c11f61a876ed6fcca53d442ed3f33ea8362a0f9
  2. Affected versionversion=204b394a23ad5e30944f23518e21e844614da2ff <4e3301e2a651d742c05914f6074a25b8e41bce19
  3. Affected versionversion=204b394a23ad5e30944f23518e21e844614da2ff <56100baa0eb7055b1026dfa73e696e8066ff71fd
  4. Affected versionversion=204b394a23ad5e30944f23518e21e844614da2ff <af1759d8e6e6da9ba94f30a2f92546f406899aa7
  5. Affected versionversion=204b394a23ad5e30944f23518e21e844614da2ff <c9b85aa2cf73ea645e55e2c2670e0ddebfe1589b
  6. Affected versionversion=204b394a23ad5e30944f23518e21e844614da2ff <f98a9890ca42f4223d2d4c50e0660af3e012fcb4
  7. Affected versionversion=6.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=204b394a23ad5e30944f23518e21e844614da2ff <0c11f61a876ed6fcca53d442ed3f33ea8362a0f9; version=204b394a23ad5e30944f23518e21e844614da2ff <4e3301e2a651d742c05914f6074a25b8e41bce19; version=204b394a23ad5e30944f23518e21e844614da2ff <56100baa0eb7055b1026dfa73e696e8066ff71fd; version=204b394a23ad5e30944f23518e21e844614da2ff <af1759d8e6e6da9ba94f30a2f92546f406899aa7; version=204b394a23ad5e30944f23518e21e844614da2ff <c9b85aa2cf73ea645e55e2c2670e0ddebfe1589b; version=204b394a23ad5e30944f23518e21e844614da2ff <f98a9890ca42f4223d2d4c50e0660af3e012fcb4; version=6.0

Published CVSS scores

8.2UbuntuCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.2LinuxCVSS:3.1/AV:L/AC:L/PR:H/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 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-833Deadlock
T1499.004Application or System Exploitation

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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