CVE-2026-31581 (GCVE-0-2026-31581)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-04-24 14:42
VLAI?
Title
ALSA: 6fire: fix use-after-free on disconnect
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < af75b486f7e883e3422ece23c8d727e6815144a0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d21e8a2af4869b5890b34e081d5aeadc93e9cd5c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3dc20d1981d6a67d8184498a5da272942dde1e65 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 51f6532790b74ffdd6970bc848358a2838c1c185 (git)
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    Linux Linux Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
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{
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        {
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          "product": "Linux",
          "programFiles": [
            "sound/usb/6fire/chip.c"
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          "vendor": "Linux",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: 6fire: fix use-after-free on disconnect\n\nIn usb6fire_chip_abort(), the chip struct is allocated as the card\u0027s\nprivate data (via snd_card_new with sizeof(struct sfire_chip)).  When\nsnd_card_free_when_closed() is called and no file handles are open, the\ncard and embedded chip are freed synchronously.  The subsequent\nchip-\u003ecard = NULL write then hits freed slab memory.\n\nCall trace:\n  usb6fire_chip_abort sound/usb/6fire/chip.c:59 [inline]\n  usb6fire_chip_disconnect+0x348/0x358 sound/usb/6fire/chip.c:182\n  usb_unbind_interface+0x1a8/0x88c drivers/usb/core/driver.c:458\n  ...\n  hub_event+0x1a04/0x4518 drivers/usb/core/hub.c:5953\n\nFix by moving the card lifecycle out of usb6fire_chip_abort() and into\nusb6fire_chip_disconnect().  The card pointer is saved in a local\nbefore any teardown, snd_card_disconnect() is called first to prevent\nnew opens, URBs are aborted while chip is still valid, and\nsnd_card_free_when_closed() is called last so chip is never accessed\nafter the card may be freed."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-04-24T14:42:11.557Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/51f6532790b74ffdd6970bc848358a2838c1c185"
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      ],
      "title": "ALSA: 6fire: fix use-after-free on disconnect",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31581",
    "datePublished": "2026-04-24T14:42:11.557Z",
    "dateReserved": "2026-03-09T15:48:24.119Z",
    "dateUpdated": "2026-04-24T14:42:11.557Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-04-26",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31581\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:32.797\",\"lastModified\":\"2026-04-24T17:51:40.810\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: 6fire: fix use-after-free on disconnect\\n\\nIn usb6fire_chip_abort(), the chip struct is allocated as the card\u0027s\\nprivate data (via snd_card_new with sizeof(struct sfire_chip)).  When\\nsnd_card_free_when_closed() is called and no file handles are open, the\\ncard and embedded chip are freed synchronously.  The subsequent\\nchip-\u003ecard = NULL write then hits freed slab memory.\\n\\nCall trace:\\n  usb6fire_chip_abort sound/usb/6fire/chip.c:59 [inline]\\n  usb6fire_chip_disconnect+0x348/0x358 sound/usb/6fire/chip.c:182\\n  usb_unbind_interface+0x1a8/0x88c drivers/usb/core/driver.c:458\\n  ...\\n  hub_event+0x1a04/0x4518 drivers/usb/core/hub.c:5953\\n\\nFix by moving the card lifecycle out of usb6fire_chip_abort() and into\\nusb6fire_chip_disconnect().  The card pointer is saved in a local\\nbefore any teardown, snd_card_disconnect() is called first to prevent\\nnew opens, URBs are aborted while chip is still valid, and\\nsnd_card_free_when_closed() is called last so chip is never accessed\\nafter the card may be freed.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3dc20d1981d6a67d8184498a5da272942dde1e65\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51f6532790b74ffdd6970bc848358a2838c1c185\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/af75b486f7e883e3422ece23c8d727e6815144a0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d21e8a2af4869b5890b34e081d5aeadc93e9cd5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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