CVE-2026-80828 (GCVE-0-2026-80828)
Vulnerability from cvelistv5
Published
2026-09-04 15:54
Modified
2026-10-19 08:44
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Complete cleanup after system-resume errors A failed system resume can leave the card unusable until reboot. usb_audio_resume() jumps to err_out when snd_usb_pcm_resume() or snd_usb_mixer_resume() fails. The error path skips the out: block, which restores D0 and decrements chip->num_suspended_intf. The card stays in SNDRV_CTL_POWER_D3hot, so later control access blocks in snd_power_ref_and_wait(). USB core logs an interface resume callback error. It does not retry that callback, so a later callback cannot complete the skipped cleanup. usb_audio_suspend() increments num_suspended_intf before returning success. A system-resume callback must consume the system-suspend count even if a component resume fails. Otherwise, the stranded count skews later suspend and resume cycles. Do not apply this cleanup to runtime-resume errors. Runtime PM can retry -EAGAIN or -EBUSY without another suspend callback. The count must continue to describe that suspended interface. Other runtime-resume errors latch runtime_error in the PM core and do not cause an immediate callback retry. Both parts of the system-resume error path are longstanding. Commit 88a8516a2128a ("ALSA: usbaudio: implement USB autosuspend") introduced err_out past the D0 restore. Commit 862b2509d157c ("ALSA: usb-audio: Fix inconsistent card PM state after resume") later moved num_suspended_intf-- into the out: block. The error path now skips both operations. No third-party code is needed to reach the error path. snd_usb_mixer_resume() ends in snd_usb_mixer_activate(), which returns the result of usb_submit_urb() for devices that have a mixer status URB. Its mixer->private_resume hook can also fail through scarlett2_init_notify(). snd_usb_pcm_resume() issues a SET_CUR request to a UAC3 power domain. It can return -EPIPE or -EIO when the device stalls the request. Route a component error through out: only when system_suspend is nonzero. Continue to return runtime-resume errors through err_out. Later component resume stages remain skipped. The original error still reaches USB core. A later transfer can fail if the device did not recover. I reproduced the system-resume failure on an Audient iD14 MkI with an out-of-tree diagnostic mixer resume hook. An injected -EIO on the unpatched core left control readers in uninterruptible sleep in snd_power_ref_and_wait() until a reboot. With this patch, the same failure restored control access. A second system suspend and resume also succeeded after I disabled fault injection.
References
Impacted products
Vendor Product Version
Linux Linux Version: 88a8516a2128a6d078a106ead48092240e8a138f
Version: 88a8516a2128a6d078a106ead48092240e8a138f
Version: 88a8516a2128a6d078a106ead48092240e8a138f
Version: 88a8516a2128a6d078a106ead48092240e8a138f
Version: 88a8516a2128a6d078a106ead48092240e8a138f
Version: 88a8516a2128a6d078a106ead48092240e8a138f
Version: 88a8516a2128a6d078a106ead48092240e8a138f
Version: 88a8516a2128a6d078a106ead48092240e8a138f
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{
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          "programFiles": [
            "sound/usb/card.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Complete cleanup after system-resume errors\n\nA failed system resume can leave the card unusable until reboot.\nusb_audio_resume() jumps to err_out when snd_usb_pcm_resume() or\nsnd_usb_mixer_resume() fails. The error path skips the out: block, which\nrestores D0 and decrements chip-\u003enum_suspended_intf.\n\nThe card stays in SNDRV_CTL_POWER_D3hot, so later control access blocks in\nsnd_power_ref_and_wait(). USB core logs an interface resume callback error.\nIt does not retry that callback, so a later callback cannot complete the\nskipped cleanup.\n\nusb_audio_suspend() increments num_suspended_intf before returning success.\nA system-resume callback must consume the system-suspend count even if a\ncomponent resume fails. Otherwise, the stranded count skews later suspend\nand resume cycles.\n\nDo not apply this cleanup to runtime-resume errors. Runtime PM can retry\n-EAGAIN or -EBUSY without another suspend callback. The count must continue\nto describe that suspended interface. Other runtime-resume errors latch\nruntime_error in the PM core and do not cause an immediate callback retry.\n\nBoth parts of the system-resume error path are longstanding. Commit\n88a8516a2128a (\"ALSA: usbaudio: implement USB autosuspend\") introduced\nerr_out past the D0 restore. Commit 862b2509d157c (\"ALSA: usb-audio: Fix\ninconsistent card PM state after resume\") later moved\nnum_suspended_intf-- into the out: block. The error path now skips both\noperations.\n\nNo third-party code is needed to reach the error path.\nsnd_usb_mixer_resume() ends in snd_usb_mixer_activate(), which returns the\nresult of usb_submit_urb() for devices that have a mixer status URB. Its\nmixer-\u003eprivate_resume hook can also fail through scarlett2_init_notify().\nsnd_usb_pcm_resume() issues a SET_CUR request to a UAC3 power domain. It\ncan return -EPIPE or -EIO when the device stalls the request.\n\nRoute a component error through out: only when system_suspend is nonzero.\nContinue to return runtime-resume errors through err_out. Later component\nresume stages remain skipped. The original error still reaches USB core.\nA later transfer can fail if the device did not recover.\n\nI reproduced the system-resume failure on an Audient iD14 MkI with an\nout-of-tree diagnostic mixer resume hook. An injected -EIO on the unpatched\ncore left control readers in uninterruptible sleep in\nsnd_power_ref_and_wait() until a reboot. With this patch, the same failure\nrestored control access. A second system suspend and resume also succeeded\nafter I disabled fault injection."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:44:20.734Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3fa521c3c54b42e16cad8ade76551113a783752b"
        },
        {
          "url": "https://git.kernel.org/stable/c/3f06f3f5b16212f180764654a9398ff5f7a855c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1c05c41d07b874635d681ae328d13ec550470c5"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a625fc2284e35f33693efd9534aebaca3b005d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d3e202670b819c414076a5d07dffac8a39274ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c94877b6bab9185898bcad4b082ff5592558921"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1f643b1c0258bd519146f7a342bbb394d413912"
        },
        {
          "url": "https://git.kernel.org/stable/c/1739a976312e110c93a8dee66a1cdf893a1b187e"
        }
      ],
      "title": "ALSA: usb-audio: Complete cleanup after system-resume errors",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80828",
    "datePublished": "2026-09-04T15:54:32.894Z",
    "dateReserved": "2026-08-26T14:34:25.795Z",
    "dateUpdated": "2026-10-19T08:44:20.734Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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