s390/vfio_ccw: Free all memory if cp_init() fails (CVE-2026-80555) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80555

s390/vfio_ccw: Free all memory if cp_init() fails

Answer in brief

CVE-2026-80555 records a Unknown severity vulnerability in s390/vfio_ccw: Free all memory if cp_init() fails. 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	>=8b515be512a2435bb8aedc6390cbe140167f9eb9 <6a917199aaf97904f5619afe3dfdacb155b03e8c \|\| >=8b515be512a2435bb8aedc6390cbe140167f9eb9 <32e3d364a7b8295120d37e6a6bd433d2de26f748 \|\| >=8b515be512a2435bb8aedc6390cbe140167f9eb9 <4699b54fada156534cbb39834d47fc9374d7a1f5 \|\| >=8b515be512a2435bb8aedc6390cbe140167f9eb9 <74186c2968f8f756ac3226b545b598457c910c75	6a917199aaf97904f5619afe3dfdacb155b03e8c, 32e3d364a7b8295120d37e6a6bd433d2de26f748, 4699b54fada156534cbb39834d47fc9374d7a1f5, 74186c2968f8f756ac3226b545b598457c910c75
Linux/Linuxgeneric	5.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 6a917199aaf97904f5619afe3dfdacb155b03e8c 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: Free all memory if cp_init() fails The routine cp_free() is called to unpin/free any memory once an I/O is completed successfully, or if cp_prefetch() fails. But if cp_init() fails, and cp->initialized is not enabled, the same routine cannot be used to free all the memory. An attempt to address this exists in ccwchain_handle_ccw(), where a single call to ccwchain_free() is made for the currently-processed CCW segment. But this will leak other segments (created as a result of a Transfer in Channel) that had been allocated as part of the same channel program. Address this by performing the cleanup outside of the recursive ccwchain_handle_ccw()/ccwchain_loop_tic() logic.

Quoted source text, attributed separately from HOL analysis.