{"id":"CVE-2026-53241","title":"ALSA: seq: dummy: fix UMP event stack overread","summary":"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 s…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 32cb23a0f911317cdb5030035e49a204aa86fef5 < a7ef78a2c536242ccb7a4429da01580b2409bb24","Linux >= 32cb23a0f911317cdb5030035e49a204aa86fef5 < 6671a46144f880c5a167930ebb14c12f3d059fe9","Linux >= 32cb23a0f911317cdb5030035e49a204aa86fef5 < 6676b6063440561db600494049ce7ffb695c8cc4","Linux >= 32cb23a0f911317cdb5030035e49a204aa86fef5 < 2b5ff4db5d7aa5b981d966df02e687f79ad7b311","Linux 6.10"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:23:37.290661Z"},"published":"2026-06-25","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:24:08.727Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53241","references":[{"url":"https://git.kernel.org/stable/c/a7ef78a2c536242ccb7a4429da01580b2409bb24"},{"url":"https://git.kernel.org/stable/c/6671a46144f880c5a167930ebb14c12f3d059fe9"},{"url":"https://git.kernel.org/stable/c/6676b6063440561db600494049ce7ffb695c8cc4"},{"url":"https://git.kernel.org/stable/c/2b5ff4db5d7aa5b981d966df02e687f79ad7b311"}],"tags":["cve.org"],"epss":0.00162,"epssPercentile":0.05382,"ingestedAt":"2026-11-06T16:57:43.269Z","slug":"CVE-2026-53241","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 32cb23a0f911317cdb5030035e49a204aa86fef5 < a7ef78a2c536242ccb7a4429da01580b2409bb24`\n- `Linux >= 32cb23a0f911317cdb5030035e49a204aa86fef5 < 6671a46144f880c5a167930ebb14c12f3d059fe9`\n- `Linux >= 32cb23a0f911317cdb5030035e49a204aa86fef5 < 6676b6063440561db600494049ce7ffb695c8cc4`\n- `Linux >= 32cb23a0f911317cdb5030035e49a204aa86fef5 < 2b5ff4db5d7aa5b981d966df02e687f79ad7b311`\n- `Linux 6.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}