{"id":"CVE-2026-46022","revision":"bc2ac87077054bd5a27e6168a080240b","records":[{"revision":"bc2ac87077054bd5a27e6168a080240b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-46022","aliases":[],"title":"misc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: ibmasm: fix OOB MMIO read in ibmasm_handle_mouse_interrupt()\n\nibmasm_handle_mouse_interrupt() performs an out-of-bounds MMIO read\nwhen the queue reader or writer index from hardware exceeds\nREMOTE_QUEUE_SIZE (60).\n\nA compromised service processor can trigger this by writing an\nout-of-range value to the reader or writer MMIO register before\nasserting an interrupt. Since writer is re-read from hardware on\nevery loop iteration, it can also be set to an out-of-range value\nafter the loop has already started.\n\nThe root cause is that get_queue_reader() and get_queue_writer() return\nraw readl() values that are passed directly into get_queue_entry(),\nwhich computes:\n\n  queue_begin + reader * sizeof(struct remote_input)\n\nwith no bounds check. This unchecked MMIO address is then passed to\nmemcpy_fromio(), reading 8 bytes from unintended device registers.\nFor sufficiently large values the address falls outside the PCI BAR\nmapping entirely, triggering a machine check exception.\n\nFix by checking both indices against REMOTE_QUEUE_SIZE at the top of\nthe loop body, before any call to get_queue_entry(). On an out-of-range\nvalue, reset the reader register to 0 via set_queue_reader() before\nbreaking, so that normal queue operation can resume if the corrupted\nhardware state is transient.","state":0,"publishedAt":"2026-05-27T12:56:26.791+00:00","modifiedAt":"2026-10-15T01:20:00.194+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/misc/ibmasm/remote.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"278d72ae8803ffcd16070c95fe1d53f4466dc741\",\n                            \"lessThan\": \"6f6ecc9153df176e956d0664b56f93080b0a45f0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"278d72ae8803ffcd16070c95fe1d53f4466dc741\",\n                            \"lessThan\": \"bac8643486f854dd53af9b23aea7dbbd9b7c1865\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"278d72ae8803ffcd16070c95fe1d53f4466dc741\",\n                            \"lessThan\": \"f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"278d72ae8803ffcd16070c95fe1d53f4466dc741\",\n                            \"lessThan\": \"fc7e9a74e32299d7e93e178ca482a0b59ef1595b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"278d72ae8803ffcd16070c95fe1d53f4466dc741\",\n                            \"lessThan\": \"07c4f18b303106e6b24492c12b95d48a4b985841\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"278d72ae8803ffcd16070c95fe1d53f4466dc741\",\n                            \"lessThan\": \"22a16d3eafee92a165c756081587c95850127107\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"278d72ae8803ffcd16070c95fe1d53f4466dc741\",\n                            \"lessThan\": \"1ca75f6b74ec7f685464e5745ecfcf3a76d284e9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"278d72ae8803ffcd16070c95fe1d53f4466dc741\",\n                            \"lessThan\": \"4b6e6ead556734bdc14024c5f837132b1e7a4b84\",\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/misc/ibmasm/remote.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.258\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.209\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.175\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.140\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.86\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.27\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.4\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/6f6ecc9153df176e956d0664b56f93080b0a45f0","https://git.kernel.org/stable/c/bac8643486f854dd53af9b23aea7dbbd9b7c1865","https://git.kernel.org/stable/c/f7e5b4eefd7be3e09f8bd5fee63ed478fd7446ab","https://git.kernel.org/stable/c/fc7e9a74e32299d7e93e178ca482a0b59ef1595b","https://git.kernel.org/stable/c/07c4f18b303106e6b24492c12b95d48a4b985841","https://git.kernel.org/stable/c/22a16d3eafee92a165c756081587c95850127107","https://git.kernel.org/stable/c/1ca75f6b74ec7f685464e5745ecfcf3a76d284e9","https://git.kernel.org/stable/c/4b6e6ead556734bdc14024c5f837132b1e7a4b84"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-46022","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-46022","identifiers":["CVE-2026-46022"]},"retained":false,"historicalAffected":[]}],"coverage":[]}