{"id":"CVE-2026-90191","revision":"f85d9bb7a8e843399fea5b98acb59a0e","records":[{"revision":"f85d9bb7a8e843399fea5b98acb59a0e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90191","aliases":[],"title":"mailbox: riscv-sbi-mpxy: validate RPMI notification lengths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmailbox: riscv-sbi-mpxy: validate RPMI notification lengths\n\nThe SBI return value controls how many bytes are copied from shared\nmemory into the RPMI notification buffer. It is not validated against\nthe negotiated shared-memory size before that copy. The event walker\nalso uses a reversed loop condition and can inspect a short event record.\n\nValidate the complete notification length before copying it, iterate only\nwhile a full event header remains, and stop when a declared event payload\nextends beyond the copied notification data.","state":0,"publishedAt":"2026-09-17T16:07:12.339+00:00","modifiedAt":"2026-10-19T08:59:27.897+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/mailbox/riscv-sbi-mpxy-mbox.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"bf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57\",\n                            \"lessThan\": \"cbc24bce70dfd91c7b2f53b4fa896e9a4b6d6a6b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57\",\n                            \"lessThan\": \"c7bc5e7677bcda7a446d63b989cfaa3fe91d6b76\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bf3022a4eb119c6b4e3424d6b19d8bfdfbc9bb57\",\n                            \"lessThan\": \"11d5af151bcbe78f5a579e0faecd3be9cea0399a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/mailbox/riscv-sbi-mpxy-mbox.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.18\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.18\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/cbc24bce70dfd91c7b2f53b4fa896e9a4b6d6a6b","https://git.kernel.org/stable/c/c7bc5e7677bcda7a446d63b989cfaa3fe91d6b76","https://git.kernel.org/stable/c/11d5af151bcbe78f5a579e0faecd3be9cea0399a"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90191","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90191","identifiers":["CVE-2026-90191"]},"retained":false,"historicalAffected":[]}],"coverage":[]}