{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90220","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.793Z","datePublished":"2026-09-17T16:07:31.423Z","dateUpdated":"2026-09-17T16:07:31.423Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-17T16:07:31.423Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: seq: Don't leak the extension cell pointer in the bounce payload\n\nThe bounce_error_event() embeds the failed event in the bounce payload\nby pointing data.ext.ptr at it.  When that event is a queued\nvariable-length event, its own data.ext.ptr holds the address of its\nfirst extension cell, put there by snd_seq_event_dup().  The payload\ngoes out verbatim through snd_seq_expand_var_event(), so the address\nreaches userspace.\n\nThat is the same address commit 705dd6dcbc0e (\"ALSA: seq: Clear\nvariable event pointer on read\") removed from the event header.  The\nread path still clears it there, just above the call that expands the\npayload.\n\nEmbed a sanitised copy instead, treated exactly as snd_seq_read()\ntreats the header.  A stack copy is enough because delivery is\nsynchronous and snd_seq_event_dup() copies before returning.\n\nAn unprivileged client reaches this by setting SNDRV_SEQ_FILTER_BOUNCE,\nqueueing a variable-length event to a port that does not exist and\nreading the bounce back.  Eight bytes on 64-bit, from its own pool."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/seq/seq_clientmgr.c"],"versions":[{"version":"93d260ce43a81df579c98bee92b91316df9c1c57","lessThan":"42c3f856d13a91a0d4c302a0c6854813621136db","status":"affected","versionType":"git"},{"version":"dae23c545eb5a2be3b27a82fd0f611894fb8ab69","lessThan":"b1e8d40663997aacaa198f37ce6893e07aaba77a","status":"affected","versionType":"git"},{"version":"efc86691e4d8083d9e380ea95042c2cf679f65fd","lessThan":"6e6e471eef1d5d8cb056c7d364023fe048249204","status":"affected","versionType":"git"},{"version":"efc86691e4d8083d9e380ea95042c2cf679f65fd","lessThan":"59e1592d3c270ff4642d5d6dc55c545306eb0693","status":"affected","versionType":"git"},{"version":"0527a56cb327021cb73167cfddf0e49efa043500","status":"affected","versionType":"git"},{"version":"6.12.97","lessThan":"6.12.110","status":"affected","versionType":"semver"},{"version":"6.18.40","lessThan":"6.18.52","status":"affected","versionType":"semver"},{"version":"7.1.5","lessThan":"7.2","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/core/seq/seq_clientmgr.c"],"versions":[{"version":"7.2","status":"affected"},{"version":"0","lessThan":"7.2","status":"unaffected","versionType":"semver"},{"version":"6.12.110","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.52","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.97","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.40","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.2","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.2","versionEndExcluding":"7.3-rc1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1.5"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/42c3f856d13a91a0d4c302a0c6854813621136db"},{"url":"https://git.kernel.org/stable/c/b1e8d40663997aacaa198f37ce6893e07aaba77a"},{"url":"https://git.kernel.org/stable/c/6e6e471eef1d5d8cb056c7d364023fe048249204"},{"url":"https://git.kernel.org/stable/c/59e1592d3c270ff4642d5d6dc55c545306eb0693"}],"title":"ALSA: seq: Don't leak the extension cell pointer in the bounce payload","x_generator":{"engine":"bippy-1.2.0"}}}}