{"id":"CVE-2026-72446","summary":"ALSA: usb-audio: qcom: reject stream disable with no active interface","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: qcom: reject stream disable with no active interface\n\nhandle_uaudio_stream_req() resolves an interface index with\ninfo_idx_from_ifnum(), which returns -EINVAL when no interface matches.\nThe enable branch and the response: cleanup label both guard against a\nnegative index, but the disable branch does not: it forms\ninfo = &uadev[pcm_card_num].info[info_idx] and dereferences it.\n\nuadev[].info is a pointer allocated only when a stream is first enabled,\nso a negative info_idx on the disable path is unsafe in two ways:\n\n - If the card was never enabled, .info is NULL and &info[-EINVAL] is a\n   wild pointer; reading info-\u003edata_ep_pipe faults (kernel oops).\n\n - If the card was enabled at least once (.info allocated) and the\n   disable names an interface that does not match, &info[-EINVAL] points\n   before the allocation; info-\u003edata_ep_pipe / info-\u003esync_ep_pipe are an\n   out-of-bounds slab read and, when non-zero, an out-of-bounds 4-byte\n   write (both pipe fields are cleared to 0). That is memory corruption,\n   not just a NULL dereference.\n\nThe request is reachable from unprivileged local userspace over\nAF_QIPCRTR. Reject a disable request with no resolved interface, matching\nthe guard the enable path already has.","modified":"2026-08-18T03:56:56.047100658Z","published":"2026-08-15T05:56:56.470Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72446.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/25a867aa5e67a84333fa6e5c21292c5bcff86b90"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a22356d1f731553e99aa2707dbd38c659bdd28d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bdb640be82e645e2828731648f485224d0c2587b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72446.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72446"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"326bbc348298ab0946c5560defe024a5f6ef28bb"},{"fixed":"25a867aa5e67a84333fa6e5c21292c5bcff86b90"},{"fixed":"a22356d1f731553e99aa2707dbd38c659bdd28d8"},{"fixed":"bdb640be82e645e2828731648f485224d0c2587b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72446.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.16.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72446.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}