{"id":"CVE-2026-53241","summary":"ALSA: seq: dummy: fix UMP event stack overread","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: dummy: fix UMP event stack overread\n\nThe dummy sequencer port forwards events by copying an incoming\nstruct snd_seq_event into a stack temporary, rewriting source and\ndestination, and dispatching the temporary to subscribers. That legacy\nevent storage is smaller than struct snd_seq_ump_event.\n\nWhen a UMP event reaches the dummy client, the copy leaves the UMP flag\nset but only provides legacy-sized stack storage. The subscriber\ndelivery path then uses snd_seq_event_packet_size() and copies a\nUMP-sized packet from that stack object, reading past the end of the\ntemporary.\n\nUse the existing union __snd_seq_event storage and copy the packet size\nreported for the incoming event before rewriting the common routing\nfields. This preserves the full UMP packet for UMP events while keeping\nlegacy event handling unchanged.","modified":"2026-07-09T18:31:31.201958600Z","published":"2026-06-25T08:39:36.482Z","related":["CGA-hvcw-mj2w-wp62"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53241.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2b5ff4db5d7aa5b981d966df02e687f79ad7b311"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6671a46144f880c5a167930ebb14c12f3d059fe9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6676b6063440561db600494049ce7ffb695c8cc4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a7ef78a2c536242ccb7a4429da01580b2409bb24"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53241.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53241"},{"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":"32cb23a0f911317cdb5030035e49a204aa86fef5"},{"fixed":"a7ef78a2c536242ccb7a4429da01580b2409bb24"},{"fixed":"6671a46144f880c5a167930ebb14c12f3d059fe9"},{"fixed":"6676b6063440561db600494049ce7ffb695c8cc4"},{"fixed":"2b5ff4db5d7aa5b981d966df02e687f79ad7b311"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53241.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.10.0"},{"fixed":"6.12.94"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53241.json"}}],"schema_version":"1.7.5"}