Out-of-bounds read in Linux kernel - CVE-2026-90191
Published: September 19, 2026
Vulnerability identifier: #VU151297
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90191
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in the riscv-sbi-mpxy mailbox RPMI notification handler when processing SBI-returned notification data. A local user can trigger processing of malformed RPMI notification data to disclose sensitive information.
Affected software
Linux kernel
How to mitigate CVE-2026-90191
Install security update from vendor's repository.