{"id":"CVE-2026-97931","revision":"62640c9abf694e39890855f6997fb56b","records":[{"revision":"62640c9abf694e39890855f6997fb56b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-97931","aliases":[],"title":"ALSA: us122l: Prevent write upgrades for read mappings","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: us122l: Prevent write upgrades for read mappings\n\nThe hwdep mmap callback rejects read-buffer mappings that are initially\nwritable, but leaves VM_MAYWRITE set on mappings created with PROT_READ.\nA process that can open the hwdep node O_RDWR can later use mprotect() to\nmake the mapping writable.\n\nThe read allocation begins with struct usb_stream. Its read_size member is\nused by the fault handler to decide which pages belong to the read buffer.\nThe read VMA intentionally remains expandable because pcm_usb_stream uses\nmremap() after reading that size. Changing read_size first can therefore\nmap and access pages beyond the allocation. The same member is also\nconsumed by usb_stream_free(), where changing it can make\nfree_pages_exact() release pages outside the allocation.\n\nClear VM_MAYWRITE for read-buffer mappings after rejecting an initially\nwritable VMA. This keeps the separate output-buffer mapping writable while\npreventing later permission upgrades.","state":0,"publishedAt":"2026-09-25T10:22:47.382+00:00","modifiedAt":"2026-10-19T09:10:58.123+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                        \"sound/usb/usx2y/us122l.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"030a07e441296c372f946cd4065b5d831d8dc40c\",\n                            \"lessThan\": \"cbc1f954ce67d739d41d1f0757d29850353ebb6a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"030a07e441296c372f946cd4065b5d831d8dc40c\",\n                            \"lessThan\": \"becb89036a1320ef0a77da2d27935ac0704345c4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"030a07e441296c372f946cd4065b5d831d8dc40c\",\n                            \"lessThan\": \"6a5f5a5a32c78e67701f1d0f26bc87af68895604\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"030a07e441296c372f946cd4065b5d831d8dc40c\",\n                            \"lessThan\": \"938e8d6cee8d36f24669dfdcd3717e081eb32d64\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"030a07e441296c372f946cd4065b5d831d8dc40c\",\n                            \"lessThan\": \"64a87950239867682cde128020e1a47088295e5c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"030a07e441296c372f946cd4065b5d831d8dc40c\",\n                            \"lessThan\": \"d9c537b14f4982f17b103e3a2cfeee4bee6bc026\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"030a07e441296c372f946cd4065b5d831d8dc40c\",\n                            \"lessThan\": \"0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"030a07e441296c372f946cd4065b5d831d8dc40c\",\n                            \"lessThan\": \"71c610aeb1770302ac9c9e0b9a4ecd37f1311928\",\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                        \"sound/usb/usx2y/us122l.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.28\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.28\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\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:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/cbc1f954ce67d739d41d1f0757d29850353ebb6a","https://git.kernel.org/stable/c/becb89036a1320ef0a77da2d27935ac0704345c4","https://git.kernel.org/stable/c/6a5f5a5a32c78e67701f1d0f26bc87af68895604","https://git.kernel.org/stable/c/938e8d6cee8d36f24669dfdcd3717e081eb32d64","https://git.kernel.org/stable/c/64a87950239867682cde128020e1a47088295e5c","https://git.kernel.org/stable/c/d9c537b14f4982f17b103e3a2cfeee4bee6bc026","https://git.kernel.org/stable/c/0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f","https://git.kernel.org/stable/c/71c610aeb1770302ac9c9e0b9a4ecd37f1311928"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97931","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97931","identifiers":["CVE-2026-97931"]},"retained":false,"historicalAffected":[]}],"coverage":[]}