{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43459",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43459"
  ],
  "published": "2026-05-08T14:22:57Z",
  "summary": "ASoC: soc-core: flush delayed work before removing DAIs and widgets",
  "details": "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).",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43459"
    },
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      "scenario": "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."
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}