CVE-2026-43459

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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)."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable ASoC/ALSA teardown path is reached locally through open PCM device files and sound-card driver unbind/removal, not by network or adjacent inputs.\nAC:L - Once a PCM playback stream is open and card unbind occurs, the delayed work is queued deterministically after disconnect; no attacker-uncontrolled race win is required.\nPR:L - A low-privileged local user with access to ALSA PCM devices can control the open stream and close side of the sequence. The unbind side is normally root-mediated, but the lower-privileged scenario is defensible when paired with required user/admin interaction.\nUI:R - A non-admin attacker cannot normally write the root-owned sysfs driver unbind attribute or unload the driver, so exploitation in the low-privileged scenario requires a privileged user or system action to unbind/remove the sound card.\nS:U - The impact remains within the local kernel security authority; this is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is a kernel use-after-free in delayed work over freed DAPM/DAI-related objects. Following kernel scoring guidance, UAF memory corruption can enable high-impact information disclosure.\nI:H - The delayed work writes through freed widget/list objects and can corrupt kernel heap state. Following kernel scoring guidance, UAF memory corruption is treated as potentially enabling arbitrary write or control-flow compromise.\nA:H - Even without full exploitation, the use-after-free can dereference or mutate freed kernel objects from a workqueue and plausibly cause an oops, panic, or hang."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/soc/soc-core.c"], "versions": [{"version": "e894efef9ac7c10b7727798dcc711cccf07569f9", "lessThan": "bf80a89da97285d9b877e0c6995e870d46b8025c", "status": "affected", "versionType": "git"}, {"version": "e894efef9ac7c10b7727798dcc711cccf07569f9", "lessThan": "3887e514978d28216246360b46a9cb534969eb5a", "status": "affected", "versionType": "git"}, {"version": "e894efef9ac7c10b7727798dcc711cccf07569f9", "lessThan": "231568afbc0cd25b8fb2a94ebf9738eabe1cf007", "status": "affected", "versionType": "git"}, 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work before removing DAIs and widgets", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-43459", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:17:35.638816Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T19:26:37.236Z"}}]}}

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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)."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable ASoC/ALSA teardown path is reached locally through open PCM device files and sound-card driver unbind/removal, not by network or adjacent inputs.\nAC:L - Once a PCM playback stream is open and card unbind occurs, the delayed work is queued deterministically after disconnect; no attacker-uncontrolled race win is required.\nPR:L - A low-privileged local user with access to ALSA PCM devices can control the open stream and close side of the sequence. The unbind side is normally root-mediated, but the lower-privileged scenario is defensible when paired with required user/admin interaction.\nUI:R - A non-admin attacker cannot normally write the root-owned sysfs driver unbind attribute or unload the driver, so exploitation in the low-privileged scenario requires a privileged user or system action to unbind/remove the sound card.\nS:U - The impact remains within the local kernel security authority; this is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug is a kernel use-after-free in delayed work over freed DAPM/DAI-related objects. Following kernel scoring guidance, UAF memory corruption can enable high-impact information disclosure.\nI:H - The delayed work writes through freed widget/list objects and can corrupt kernel heap state. Following kernel scoring guidance, UAF memory corruption is treated as potentially enabling arbitrary write or control-flow compromise.\nA:H - Even without full exploitation, the use-after-free can dereference or mutate freed kernel objects from a workqueue and plausibly cause an oops, panic, or hang."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["sound/soc/soc-core.c"], "versions": [{"version": "e894efef9ac7c10b7727798dcc711cccf07569f9", "lessThan": "bf80a89da97285d9b877e0c6995e870d46b8025c", "status": "affected", "versionType": "git"}, {"version": "e894efef9ac7c10b7727798dcc711cccf07569f9", "lessThan": "3887e514978d28216246360b46a9cb534969eb5a", "status": "affected", "versionType": "git"}, {"version": "e894efef9ac7c10b7727798dcc711cccf07569f9", "lessThan": "231568afbc0cd25b8fb2a94ebf9738eabe1cf007", "status": "affected", "versionType": "git"}, 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"6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9", "versionEndExcluding": "6.19.9", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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_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)."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nASoC: soc-core: vaciar trabajo retrasado antes de eliminar DAIs y widgets\n\nCuando una tarjeta de sonido se desvincula mientras un flujo PCM est\u00e1 abierto, puede ocurrir un uso despu\u00e9s de liberaci\u00f3n en snd_soc_dapm_stream_event(), llamado desde el gestor de la cola de trabajo close_delayed_work.\n\nDurante la desvinculaci\u00f3n, snd_soc_unbind_card() vac\u00eda el trabajo retrasado y luego llama a soc_cleanup_card_resources(). Dentro de la limpieza, snd_card_disconnect_sync() libera todos los descriptores de archivo PCM, y la ruta de cierre PCM resultante puede llamar a snd_soc_dapm_stream_stop() que programa nuevo trabajo retrasado con un retardo de temporizador pmdown_time. Dado que esto ocurre despu\u00e9s del vaciado en snd_soc_unbind_card(), el nuevo trabajo no es capturado. soc_remove_link_components() luego libera los widgets DAPM antes de que este trabajo se active, lo que lleva al uso despu\u00e9s de liberaci\u00f3n.\n\nEl vaciado existente en soc_free_pcm_runtime() tampoco puede ayudar ya que se ejecuta despu\u00e9s de que soc_remove_link_components() ya ha liberado los widgets.\n\nA\u00f1adir un vaciado en soc_cleanup_card_resources() despu\u00e9s de snd_card_disconnect_sync() (despu\u00e9s de lo cual ning\u00fan nuevo cierre PCM puede programar m\u00e1s trabajo retrasado) y antes de soc_remove_link_dais() y soc_remove_link_components() (que desmantelan las estructuras a las que accede el trabajo retrasado)."}], "id": "CVE-2026-43459", "lastModified": "2026-11-11T20:10:00.273", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43459", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:17:35.638816Z", "version": "2.0.3"}}]}, "published": "2026-05-08T15:16:58.753", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/231568afbc0cd25b8fb2a94ebf9738eabe1cf007"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/317a9298c54bb00319da73e5a7179f00e67fcbdf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3887e514978d28216246360b46a9cb534969eb5a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d33e6140945482a07f8089ee86e13e02553ffdb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/95bc5c225513fc3c4ce169563fb5e3929fbb938b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bf80a89da97285d9b877e0c6995e870d46b8025c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c054f0607c8bb1b1aa529bc109e4149298a1cccd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/eab71e11ce2447c1e01809cbc11eab4234cf8dc8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ASoC: soc-core: flush delayed work before removing DAIs and widgets", "id": "2468227", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468227"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-364", "details": ["A flaw was found in the Linux kernel's sound subsystem (ASoC). When a sound card is unbound while an audio stream is active, a timing issue can lead to a use-after-free vulnerability. This occurs because certain resources are freed before all pending operations are completed. A local attacker could exploit this flaw to cause a system crash, leading to a denial of service."], "name": "CVE-2026-43459", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43459\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43459\nhttps://lore.kernel.org/linux-cve-announce/2026050800-CVE-2026-43459-2ed8@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e894efef9ac7c10b7727798dcc711cccf07569f9,bf80a89da97285d9b877e0c6995e870d46b8025c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e894efef9ac7c10b7727798dcc711cccf07569f9,3887e514978d28216246360b46a9cb534969eb5a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e894efef9ac7c10b7727798dcc711cccf07569f9,231568afbc0cd25b8fb2a94ebf9738eabe1cf007)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e894efef9ac7c10b7727798dcc711cccf07569f9,317a9298c54bb00319da73e5a7179f00e67fcbdf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e894efef9ac7c10b7727798dcc711cccf07569f9,eab71e11ce2447c1e01809cbc11eab4234cf8dc8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e894efef9ac7c10b7727798dcc711cccf07569f9,7d33e6140945482a07f8089ee86e13e02553ffdb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e894efef9ac7c10b7727798dcc711cccf07569f9,c054f0607c8bb1b1aa529bc109e4149298a1cccd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e894efef9ac7c10b7727798dcc711cccf07569f9,95bc5c225513fc3c4ce169563fb5e3929fbb938b)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.20"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.20)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.253,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.203,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.167,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.19,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.9,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-08T16:45:13.006688+00:00", "updated": "2026-05-21T20:15:18.461731+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}