CVE-2026-90191

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxbf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57 < cbc24bce70dfd91c7b2f53b4fa896e9a4b6d6a6baffected
LinuxLinuxbf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57 < c7bc5e7677bcda7a446d63b989cfaa3fe91d6b76affected
LinuxLinuxbf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57 < 11d5af151bcbe78f5a579e0faecd3be9cea0399aaffected
LinuxLinux6.18affected
LinuxLinux0 < 6.18unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References