Answer in brief
CVE-2026-90191 records a High severity (CVSS 8.4) vulnerability in mailbox: riscv-sbi-mpxy: validate RPMI notification lengths. 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.
CVSS is 8.4. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=bf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57 <cbc24bce70dfd91c7b2f53b4fa896e9a4b6d6a6b || >=bf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57 <c7bc5e7677bcda7a446d63b989cfaa3fe91d6b76 || >=bf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57 <11d5af151bcbe78f5a579e0faecd3be9cea0399a | cbc24bce70dfd91c7b2f53b4fa896e9a4b6d6a6b, c7bc5e7677bcda7a446d63b989cfaa3fe91d6b76, 11d5af151bcbe78f5a579e0faecd3be9cea0399a |
| Linux/Linuxgeneric | 6.18 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
In the Linux kernel, the following vulnerability has been resolved: mailbox: riscv-sbi-mpxy: validate RPMI notification lengths The SBI return value controls how many bytes are copied from shared memory into the RPMI notification buffer. It is not validated against the negotiated shared-memory size before that copy. The event walker also uses a reversed loop condition and can inspect a short event record. Validate the complete notification length before copying it, iterate only while a full event header remains, and stop when a declared event payload extends beyond the copied notification data.
Quoted source text, attributed separately from HOL analysis.