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Vulnerability record · CVE-2026-31581 · published 24 April 2026

CVE-2026-31581: Linux kernel use after free vulnerability

Linux · Linux Kernel

In 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.

7.8 CVSS 3.1 High EPSS 0.17% · top 93.9% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
17 Jun 2026Last modified by NVD

Description

In 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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/3dc20d1981d6a67d8184498a5da272942dde1e65 Patch
https://git.kernel.org/stable/c/51f6532790b74ffdd6970bc848358a2838c1c185 Patch
https://git.kernel.org/stable/c/af75b486f7e883e3422ece23c8d727e6815144a0 Patch
https://git.kernel.org/stable/c/b9c826916fdce6419b94eb0cd8810fdac18c2386 Patch
https://git.kernel.org/stable/c/ba88461f7653636c48321ca993006a74724c2f41
https://git.kernel.org/stable/c/d21e8a2af4869b5890b34e081d5aeadc93e9cd5c Patch
https://git.kernel.org/stable/c/e247a0e01d15ed420f77ec5e2335721bf430a5b3
https://git.kernel.org/stable/c/e719232f4552e29de8027a83918ea94434be87af
https://git.kernel.org/stable/c/e88354b381e2006de63d6b052ed7005c9a47d00e Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31581), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.