{"id":"CVE-2026-53241","state":"PUBLISHED","title":"ALSA: seq: dummy: fix UMP event stack overread","description":"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.","publishedAt":"2026-06-25T08:39:36.482Z","updatedAt":"2026-06-25T08:39:36.482Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"32cb23a0f911317cdb5030035e49a204aa86fef5","status":"affected","lessThan":"a7ef78a2c536242ccb7a4429da01580b2409bb24","versionType":"git"},{"version":"32cb23a0f911317cdb5030035e49a204aa86fef5","status":"affected","lessThan":"6671a46144f880c5a167930ebb14c12f3d059fe9","versionType":"git"},{"version":"32cb23a0f911317cdb5030035e49a204aa86fef5","status":"affected","lessThan":"6676b6063440561db600494049ce7ffb695c8cc4","versionType":"git"},{"version":"32cb23a0f911317cdb5030035e49a204aa86fef5","status":"affected","lessThan":"2b5ff4db5d7aa5b981d966df02e687f79ad7b311","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/seq/seq_dummy.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/seq/seq_dummy.c"]}],"references":["https://git.kernel.org/stable/c/a7ef78a2c536242ccb7a4429da01580b2409bb24","https://git.kernel.org/stable/c/6671a46144f880c5a167930ebb14c12f3d059fe9","https://git.kernel.org/stable/c/6676b6063440561db600494049ce7ffb695c8cc4","https://git.kernel.org/stable/c/2b5ff4db5d7aa5b981d966df02e687f79ad7b311"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53241.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53241","state":"PUBLISHED","datePublished":"2026-06-25T08:39:36.482Z","dateUpdated":"2026-06-25T08:39:36.482Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.393Z"},"containers":{"cna":{"title":"ALSA: seq: dummy: fix UMP event stack overread","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"32cb23a0f911317cdb5030035e49a204aa86fef5","status":"affected","lessThan":"a7ef78a2c536242ccb7a4429da01580b2409bb24","versionType":"git"},{"version":"32cb23a0f911317cdb5030035e49a204aa86fef5","status":"affected","lessThan":"6671a46144f880c5a167930ebb14c12f3d059fe9","versionType":"git"},{"version":"32cb23a0f911317cdb5030035e49a204aa86fef5","status":"affected","lessThan":"6676b6063440561db600494049ce7ffb695c8cc4","versionType":"git"},{"version":"32cb23a0f911317cdb5030035e49a204aa86fef5","status":"affected","lessThan":"2b5ff4db5d7aa5b981d966df02e687f79ad7b311","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/seq/seq_dummy.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.12.94","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/seq/seq_dummy.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-25T08:39:36.482Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.12.94"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}