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CVE-2026-80552

s390/vfio_ccw: Ensure index for read/write regions are within range

HIGH
8.8
CVSS Score
Published: August 26, 2026 at 02:37 PM UTC
Updated: October 16, 2026 at 08:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Ensure index for read/write regions are within range The introduction of the capability chain rightly clamped the region indexes to the range of the capabilities itself, but neglected to do so for the existing read/write regions which should also be enforced.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
5.2db8e5d17ac03a65e2e0ee0ba50bf61a99741d871
Vendor states this is fixed in 3acbedf5c0b8e0971f0de423c05cc02bbf6ddb99 (fixed)
Vendor states this is fixed in 649badf3a2fd8929e40198603a2cb21b74c21700 (fixed)
Vendor states this is fixed in 79ea5e0c4c8a9842ae85f45062d947b3297dfc07 (fixed)
Vendor states this is fixed in 988d9b5be3c2c4baf9457ce8e11b477e13eb9fcf (fixed)
Vendor states this is fixed in 9f5f9a78fedc45bc29d6a0a64e3a3472361afae5 (fixed)
Vendor states this is fixed in d3b1e38404b22df5a1f93019f2bb656feaad5ae3 (fixed)
Vendor states this is fixed in d597fa1273802941c7801202135976fecc29672b (fixed)
Vendor states this is fixed in 5.15.218 (unaffected)
Vendor states this is fixed in 5.2 (unaffected)
Vendor states this is fixed in 6.1.184 (unaffected)
Vendor states this is fixed in 6.12.105 (unaffected)
Vendor states this is fixed in 6.18.46 (unaffected)
Vendor states this is fixed in 6.6.153 (unaffected)
Vendor states this is fixed in 7.1.10 (unaffected)
Vendor states this is fixed in 7.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (7)

Source: cverecord
https://git.kernel.org/stable/c/d3b1e38404b22df5a1f93019f2bb656feaad5ae3
Source: cverecord
https://git.kernel.org/stable/c/79ea5e0c4c8a9842ae85f45062d947b3297dfc07
Source: cverecord
https://git.kernel.org/stable/c/d597fa1273802941c7801202135976fecc29672b
Source: cverecord
https://git.kernel.org/stable/c/649badf3a2fd8929e40198603a2cb21b74c21700
Source: cverecord
https://git.kernel.org/stable/c/988d9b5be3c2c4baf9457ce8e11b477e13eb9fcf
Source: cverecord
https://git.kernel.org/stable/c/9f5f9a78fedc45bc29d6a0a64e3a3472361afae5
Source: cverecord
https://git.kernel.org/stable/c/3acbedf5c0b8e0971f0de423c05cc02bbf6ddb99

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusRECEIVED

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