usb: gadget: u_audio: Fix use-after-free on sound card disconnect

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89736
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:04 UTC
Updated2026-09-11 20:20:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_audio: Fix use-after-free on sound card disconnect g_audio_cleanup() invokes snd_card_free_when_closed() to initiate sound card teardown and immediately frees the underlying struct snd_uac_chip context. However, snd_card_free_when_closed() returns asynchronously while ALSA control elements (kctls) remain open in userspace. When userspace control applications access or close these open file descriptors, kctl callbacks attempt to dereference kctl->private_data pointing to &uac->c_prm or &uac->p_prm within the freed uac structure, resulting in a use-after-free (UAF) memory corruption. Fix this issue by deferring the destruction of struct snd_uac_chip until all references to the ALSA sound card are released. Register a custom card->private_free callback (u_audio_card_free) during g_audio_setup() that frees uac and its associated playback/capture request and ring buffers only when the sound card reference count drops to zero.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b c74ff0b1a0fca53d3ac185873c87d6a719b30a47 git Not specified
CNA Linux Linux affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b 4e747c864a88537e18b1ffc19a1954c9686bb8e1 git Not specified
CNA Linux Linux affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b 79a92896e2bb9471550c56fc23d8d93592f04c27 git Not specified
CNA Linux Linux affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b 858965947081d10d41d9a1010a540d3d5eea958b git Not specified
CNA Linux Linux affected 3e016ef2e72da93a2ea7afbb45de1b481b44d761 git Not specified
CNA Linux Linux affected 3256e152b645fc1e788ba44c2d8ced690113e3e6 git Not specified
CNA Linux Linux affected 0eda2004f38d95ef5715d62be884cd344260535b git Not specified
CNA Linux Linux affected 33f341c1fc60e172a3515c51bdabee11e83d1ee9 git Not specified
CNA Linux Linux affected b131989797f7287d7fdadb2bababc05a15d44750 git Not specified
CNA Linux Linux affected 3bc7324e4911351e39c54a62e6ca46321cb10faf git Not specified
CNA Linux Linux affected 43ca70753dfffd517d2af126da28690f8f615605 git Not specified
CNA Linux Linux affected 4.14.312 4.15 semver Not specified
CNA Linux Linux affected 4.19.280 4.20 semver Not specified
CNA Linux Linux affected 5.4.240 5.5 semver Not specified
CNA Linux Linux affected 5.10.177 5.11 semver Not specified
CNA Linux Linux affected 5.15.105 5.16 semver Not specified
CNA Linux Linux affected 6.1.22 6.2 semver Not specified
CNA Linux Linux affected 6.2.9 6.3 semver Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 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/79a92896e2bb9471550c56fc23d8d93592f04c27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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