s390/vfio_ccw: Limit the number of channel program segments (CVE-2026-80554) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80554

s390/vfio_ccw: Limit the number of channel program segments

Answer in brief

CVE-2026-80554 records a Unknown severity vulnerability in s390/vfio_ccw: Limit the number of channel program segments. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 26, 2026Updated Aug 26, 2026Source checked Aug 26, 2026First seen by HOL Aug 26, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=0a19e61e6d4c6192077ead760ba0a2d350987d4c <15fb4559a7fdf0b8725e433a71cfd03a1313a48b \|\| >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <a1625f66eaa1200068a0e2c05bc90e65182fc4e3 \|\| >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2 \|\| >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <4ee94790490ae8dcc97df8597f07836c8a81bbcf \|\| >=0a19e61e6d4c6192077ead760ba0a2d350987d4c <5405c90d6a47b3014e74ee0618a162449abbbc93	15fb4559a7fdf0b8725e433a71cfd03a1313a48b, a1625f66eaa1200068a0e2c05bc90e65182fc4e3, 06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2, 4ee94790490ae8dcc97df8597f07836c8a81bbcf, 5405c90d6a47b3014e74ee0618a162449abbbc93
Linux/Linuxgeneric	4.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 15fb4559a7fdf0b8725e433a71cfd03a1313a48b if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 26, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary (but not architectural) limit to the number of CCWs that can exist in a single channel program. The vfio-ccw logic breaks these channel programs into segments whenever it encounters a Transfer-In-Channel (TIC) CCW, and the combined number of segments count towards the global limit. Impose an equivalent limit to the number of segments until such logic can be made non-recursive.

Quoted source text, attributed separately from HOL analysis.