ring-buffer: Hold cpu_buffer::lock when resizing a subbuf (CVE-2026-89501) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89501

ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

Answer in brief

CVE-2026-89501 records a Unknown severity vulnerability in ring-buffer: Hold cpu_buffer::lock when resizing a subbuf. 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	>=8e7b58c27b3c567316a51079b375b846f9223bba <8a496aaa3da6e8d545896c2370c7e617cc931ae2 \|\| >=8e7b58c27b3c567316a51079b375b846f9223bba <6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2 \|\| >=8e7b58c27b3c567316a51079b375b846f9223bba <bf242baf58de03467f226c8e29554c9495dca7fc \|\| >=8e7b58c27b3c567316a51079b375b846f9223bba <24974bd0da1b47fd56c975533ead50abf754e74d	8a496aaa3da6e8d545896c2370c7e617cc931ae2, 6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2, bf242baf58de03467f226c8e29554c9495dca7fc, 24974bd0da1b47fd56c975533ead50abf754e74d
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 8a496aaa3da6e8d545896c2370c7e617cc931ae2 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: Hold cpu_buffer::lock when resizing a subbuf Because, ring_buffer_subbuf_order_set() can clear cpu_buffer->free_page, hold cpu_buffer->lock to prevent races with ring_buffer_alloc_read_page() and ring_buffer_free_read_page().

Quoted source text, attributed separately from HOL analysis.