ALSA: 6fire: fix use-after-free on disconnect

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Summary

CVECVE-2026-31581
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:32 UTC
Updated2026-04-27 20:28:08 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: 6fire: fix use-after-free on disconnect In usb6fire_chip_abort(), the chip struct is allocated as the card's private data (via snd_card_new with sizeof(struct sfire_chip)). When snd_card_free_when_closed() is called and no file handles are open, the card and embedded chip are freed synchronously. The subsequent chip->card = NULL write then hits freed slab memory. Call trace: usb6fire_chip_abort sound/usb/6fire/chip.c:59 [inline] usb6fire_chip_disconnect+0x348/0x358 sound/usb/6fire/chip.c:182 usb_unbind_interface+0x1a8/0x88c drivers/usb/core/driver.c:458 ... hub_event+0x1a04/0x4518 drivers/usb/core/hub.c:5953 Fix by moving the card lifecycle out of usb6fire_chip_abort() and into usb6fire_chip_disconnect(). The card pointer is saved in a local before any teardown, snd_card_disconnect() is called first to prevent new opens, URBs are aborted while chip is still valid, and snd_card_free_when_closed() is called last so chip is never accessed after the card may be freed.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000180000 probability, percentile 0.048130000 (date 2026-04-27)

Problem Types: CWE-416

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b754e831a94f82f2593af806741392903f359168 e88354b381e2006de63d6b052ed7005c9a47d00e git Not specified
CNA Linux Linux affected 57860a80f03f9dc69a34a5c37b0941ad032a0a8c af75b486f7e883e3422ece23c8d727e6815144a0 git Not specified
CNA Linux Linux affected a0810c3d6dd2d29a9b92604d682eacd2902ce947 d21e8a2af4869b5890b34e081d5aeadc93e9cd5c git Not specified
CNA Linux Linux affected a0810c3d6dd2d29a9b92604d682eacd2902ce947 3dc20d1981d6a67d8184498a5da272942dde1e65 git Not specified
CNA Linux Linux affected a0810c3d6dd2d29a9b92604d682eacd2902ce947 51f6532790b74ffdd6970bc848358a2838c1c185 git Not specified
CNA Linux Linux affected a0810c3d6dd2d29a9b92604d682eacd2902ce947 b9c826916fdce6419b94eb0cd8810fdac18c2386 git Not specified
CNA Linux Linux affected 74357d0b5cd3ef544752bc9f21cbeee4902fae6c git Not specified
CNA Linux Linux affected 273eec23467dfbfbd0e4c10302579ba441fb1e13 git Not specified
CNA Linux Linux affected f2d06d4e129e2508e356136f99bb20a332ff1a00 git Not specified
CNA Linux Linux affected b889a7d68d7e76b8795b754a75c91a2d561d5e8c git Not specified
CNA Linux Linux affected ea8cc56db659cf0ae57073e32a4735ead7bd7ee3 git Not specified
CNA Linux Linux affected 0df7f4b5cc10f5adf98be0845372e9eef7bb5b09 git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.6.136 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0.1 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/51f6532790b74ffdd6970bc848358a2838c1c185 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d21e8a2af4869b5890b34e081d5aeadc93e9cd5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e88354b381e2006de63d6b052ed7005c9a47d00e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b9c826916fdce6419b94eb0cd8810fdac18c2386 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/af75b486f7e883e3422ece23c8d727e6815144a0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3dc20d1981d6a67d8184498a5da272942dde1e65 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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