{"id":"CVE-2026-43459","title":"ASoC: soc-core: flush delayed work before removing DAIs and widgets","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: soc-core: flush delayed work before removing DAIs and widgets\n\nWhen a sound card is unbound while a PCM stream is open, a\nuse-after-free can occur in snd_soc_dapm…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < bf80a89da97285d9b877e0c6995e870d46b8025c","Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 3887e514978d28216246360b46a9cb534969eb5a","Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 231568afbc0cd25b8fb2a94ebf9738eabe1cf007","Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 317a9298c54bb00319da73e5a7179f00e67fcbdf","Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < eab71e11ce2447c1e01809cbc11eab4234cf8dc8","Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 7d33e6140945482a07f8089ee86e13e02553ffdb","Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < c054f0607c8bb1b1aa529bc109e4149298a1cccd","Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 95bc5c225513fc3c4ce169563fb5e3929fbb938b","Linux 4.20"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:17:35.638816Z"},"published":"2026-05-08","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:42.281Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43459","references":[{"url":"https://git.kernel.org/stable/c/bf80a89da97285d9b877e0c6995e870d46b8025c"},{"url":"https://git.kernel.org/stable/c/3887e514978d28216246360b46a9cb534969eb5a"},{"url":"https://git.kernel.org/stable/c/231568afbc0cd25b8fb2a94ebf9738eabe1cf007"},{"url":"https://git.kernel.org/stable/c/317a9298c54bb00319da73e5a7179f00e67fcbdf"},{"url":"https://git.kernel.org/stable/c/eab71e11ce2447c1e01809cbc11eab4234cf8dc8"},{"url":"https://git.kernel.org/stable/c/7d33e6140945482a07f8089ee86e13e02553ffdb"},{"url":"https://git.kernel.org/stable/c/c054f0607c8bb1b1aa529bc109e4149298a1cccd"},{"url":"https://git.kernel.org/stable/c/95bc5c225513fc3c4ce169563fb5e3929fbb938b"}],"tags":["cve.org"],"epss":0.00165,"epssPercentile":0.05373,"ingestedAt":"2026-10-16T17:24:46.697Z","slug":"CVE-2026-43459","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nASoC: soc-core: flush delayed work before removing DAIs and widgets\n\nWhen a sound card is unbound while a PCM stream is open, a\nuse-after-free can occur in snd_soc_dapm_stream_event(), called from\nthe close_delayed_work workqueue handler.\n\nDuring unbind, snd_soc_unbind_card() flushes delayed work and then\ncalls soc_cleanup_card_resources(). Inside cleanup,\nsnd_card_disconnect_sync() releases all PCM file descriptors, and\nthe resulting PCM close path can call snd_soc_dapm_stream_stop()\nwhich schedules new delayed work with a pmdown_time timer delay.\nSince this happens after the flush in snd_soc_unbind_card(), the\nnew work is not caught. soc_remove_link_components() then frees\nDAPM widgets before this work fires, leading to the use-after-free.\n\nThe existing flush in soc_free_pcm_runtime() also cannot help as it\nruns after soc_remove_link_components() has already freed the widgets.\n\nAdd a flush in soc_cleanup_card_resources() after\nsnd_card_disconnect_sync() (after which no new PCM closes can\nschedule further delayed work) and before soc_remove_link_dais()\nand soc_remove_link_components() (which tear down the structures the\ndelayed work accesses).\n\n## Affected\n\n- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < bf80a89da97285d9b877e0c6995e870d46b8025c`\n- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 3887e514978d28216246360b46a9cb534969eb5a`\n- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 231568afbc0cd25b8fb2a94ebf9738eabe1cf007`\n- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 317a9298c54bb00319da73e5a7179f00e67fcbdf`\n- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < eab71e11ce2447c1e01809cbc11eab4234cf8dc8`\n- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 7d33e6140945482a07f8089ee86e13e02553ffdb`\n- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < c054f0607c8bb1b1aa529bc109e4149298a1cccd`\n- `Linux >= e894efef9ac7c10b7727798dcc711cccf07569f9 < 95bc5c225513fc3c4ce169563fb5e3929fbb938b`\n- `Linux 4.20`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}