CVE-2026-90191 Linux kernel mailbox riscv-sbi-mpxy - Buffer Validation Vulnerability

Linux kernel mailbox riscv-sbi-mpxy contains a buffer validation vulnerability caused by improper validation of RPMI notification lengths, letting attackers cause memory corruption or denial of service, exploit requires crafted shared memory input.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.19% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Validation Vulnerability
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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