ring-buffer: Free cpu_buffer::free_page with subbuf_order (CVE-2026-89502) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89502

ring-buffer: Free cpu_buffer::free_page with subbuf_order

Answer in brief

CVE-2026-89502 records a Unknown severity vulnerability in ring-buffer: Free cpu_buffer::free_page with subbuf_order. 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 Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 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	>=f9b94daa542a8d2532f0930f01cd9aec2d19621b <77275ccea06eaf297e8e6ac3fc830cb72086379a \|\| >=f9b94daa542a8d2532f0930f01cd9aec2d19621b <8c1ecdcdea738efe0494af908f12c0ae3a97fffa \|\| >=f9b94daa542a8d2532f0930f01cd9aec2d19621b <81063bbb16c4fcf0136c9117d5e49d3621dd6a1e \|\| >=f9b94daa542a8d2532f0930f01cd9aec2d19621b <234b1a72e9706fe20c08c96f4374ec8e83b934cb	77275ccea06eaf297e8e6ac3fc830cb72086379a, 8c1ecdcdea738efe0494af908f12c0ae3a97fffa, 81063bbb16c4fcf0136c9117d5e49d3621dd6a1e, 234b1a72e9706fe20c08c96f4374ec8e83b934cb
Linux/Linuxgeneric	6.8	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 77275ccea06eaf297e8e6ac3fc830cb72086379a if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Free cpu_buffer::free_page with subbuf_order When sub-buffers use an order greater than 0, cpu_buffer->free_page is allocated with subbuf_order. Use the correct order for cpu_buffer->free_page.

Quoted source text, attributed separately from HOL analysis.