ALSA: usb-audio: Complete cleanup after system-resume errors

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80828
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:10 UTC
Updated2026-09-04 16:18:10 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001900000 probability, percentile 0.087020000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 88a8516a2128a6d078a106ead48092240e8a138f 3fa521c3c54b42e16cad8ade76551113a783752b git Not specified
CNA Linux Linux affected 88a8516a2128a6d078a106ead48092240e8a138f 3f06f3f5b16212f180764654a9398ff5f7a855c8 git Not specified
CNA Linux Linux affected 88a8516a2128a6d078a106ead48092240e8a138f f1c05c41d07b874635d681ae328d13ec550470c5 git Not specified
CNA Linux Linux affected 88a8516a2128a6d078a106ead48092240e8a138f 5a625fc2284e35f33693efd9534aebaca3b005d4 git Not specified
CNA Linux Linux affected 88a8516a2128a6d078a106ead48092240e8a138f 6d3e202670b819c414076a5d07dffac8a39274ad git Not specified
CNA Linux Linux affected 88a8516a2128a6d078a106ead48092240e8a138f 6c94877b6bab9185898bcad4b082ff5592558921 git Not specified
CNA Linux Linux affected 88a8516a2128a6d078a106ead48092240e8a138f d1f643b1c0258bd519146f7a342bbb394d413912 git Not specified
CNA Linux Linux affected 88a8516a2128a6d078a106ead48092240e8a138f 1739a976312e110c93a8dee66a1cdf893a1b187e git Not specified
CNA Linux Linux affected 2.6.39 Not specified
CNA Linux Linux unaffected 2.6.39 semver Not specified
CNA Linux Linux unaffected 5.15.220 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.187 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.156 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.108 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.49 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.13 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2.3 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3fa521c3c54b42e16cad8ade76551113a783752b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d1f643b1c0258bd519146f7a342bbb394d413912 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f1c05c41d07b874635d681ae328d13ec550470c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5a625fc2284e35f33693efd9534aebaca3b005d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6d3e202670b819c414076a5d07dffac8a39274ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3f06f3f5b16212f180764654a9398ff5f7a855c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6c94877b6bab9185898bcad4b082ff5592558921 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1739a976312e110c93a8dee66a1cdf893a1b187e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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