CVE-2026-90191
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
In the Linux kernel, the riscv-sbi-mpxy driver did not validate the RPMI notification length returned by SBI before copying data from shared memory into the notification buffer. Additionally, the event walker used a reversed loop condition and could inspect a short event record.
Risk Assessment
May lead to buffer overflow or out-of-bounds reads of shared memory, causing memory corruption, kernel panic, or potential security impact on RISC-V platforms.
Recommendation
Update the Linux kernel to a version containing the fix that validates the complete notification length before copying and corrects the event walker loop conditions.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS