ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer() (CVE-2026-74602) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-74602

ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer()

Answer in brief

CVE-2026-74602 records a Unknown severity vulnerability in ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer(). 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 22, 2026Updated Aug 22, 2026Source checked Aug 22, 2026First seen by HOL Aug 22, 2026Material review Aug 22, 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 <2e37f2bf111429fbfa4d985b12df3ba496ca70aa \|\| >=f9b94daa542a8d2532f0930f01cd9aec2d19621b <3b3e0a6ee5bb3ac000f135beef26b2b7ed1a771a \|\| >=f9b94daa542a8d2532f0930f01cd9aec2d19621b <6d014e44b68ddd43f71288d2a4dbb1a259869149	2e37f2bf111429fbfa4d985b12df3ba496ca70aa, 3b3e0a6ee5bb3ac000f135beef26b2b7ed1a771a, 6d014e44b68ddd43f71288d2a4dbb1a259869149
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 2e37f2bf111429fbfa4d985b12df3ba496ca70aa if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 22, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer() In rb_allocate_cpu_buffer(), bpage->order was omitted, leaving it as 0. This is an issue for a ring-buffer with subbufs bigger than PAGE_SIZE if when freed: free_buffer_page() relies on this value. Align the value with the actual allocation size (buffer::subbuf_order).

Quoted source text, attributed separately from HOL analysis.