CVE-2026-98006 (GCVE-0-2026-98006)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: Decoupling ep1_in_urb in caiaq dev The epq_in_urb object belonging to the caiaq device is coupled within the struct snd_usb_caiaqdev. After usb_submit_urb(epq_in_urb, GFP_KERNEL) executes successfully, epq_in_urb is successfully added to the urbp_list queue of the dummy HCD driver (userspace specifies dummy_hcd as the HCD layer driver for the caiaq USB device). When init_card() calls snd_usb_caiaq_send_command() which subsequently fails due to a timeout, and proceeds to call snd_card_free() to release the card, the embedded ep1_in_urb object is also freed. When the dummy HCD driver detects that the URB has been unlinked, it returns the URB (by usb_hcd_giveback_urb()), which triggers [1]. Decouple the ep1_in_urb object from the struct snd_usb_caiaqdev and switch to using a pointer instead. Separately allocate and manage the memory for ep1_in_urb to prevent the release of the snd_card memory object from interfering with it. midi_out_urb has the same issue as ep1_in_urb and is handled in the same way. [1] BUG: KASAN: slab-use-after-free in usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96 Write of size 4 at addr ffff88803cee1050 by task ktimers/1/29 Call Trace: usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96 dummy_timer+0xaac/0x4d50 drivers/usb/gadget/udc/dummy_hcd.c:2019 __run_hrtimer kernel/time/hrtimer.c:2067 [inline] __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2124 hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2141 Allocated by task 36: snd_card_new+0x7b/0x110 sound/core/init.c:184 create_card sound/usb/caiaq/device.c:429 [inline] snd_probe+0x236/0x1af0 sound/usb/caiaq/device.c:544 Freed by task 36: snd_card_free_when_closed sound/core/init.c:630 [inline] snd_card_free+0x138/0x1d0 sound/core/init.c:662 snd_probe+0x162b/0x1af0 sound/usb/caiaq/device.c:553
References
Impacted products
Vendor Product Version
Linux Linux Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
Version: 523f1dce37434a9a6623bf46e7893e2b4b10ac3c
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{
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          "programFiles": [
            "sound/usb/caiaq/device.c",
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          "vendor": "Linux",
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: caiaq: Decoupling ep1_in_urb in caiaq dev\n\nThe epq_in_urb object belonging to the caiaq device is coupled within\nthe struct snd_usb_caiaqdev. After usb_submit_urb(epq_in_urb, GFP_KERNEL)\nexecutes successfully, epq_in_urb is successfully added to the urbp_list\nqueue of the dummy HCD driver (userspace specifies dummy_hcd as the HCD\nlayer driver for the caiaq USB device).\n\nWhen init_card() calls snd_usb_caiaq_send_command() which subsequently\nfails due to a timeout, and proceeds to call snd_card_free() to release\nthe card, the embedded ep1_in_urb object is also freed. When the dummy\nHCD driver detects that the URB has been unlinked, it returns the URB\n(by usb_hcd_giveback_urb()), which triggers [1].\n\nDecouple the ep1_in_urb object from the struct snd_usb_caiaqdev and switch\nto using a pointer instead. Separately allocate and manage the memory for\nep1_in_urb to prevent the release of the snd_card memory object from\ninterfering with it.\n\nmidi_out_urb has the same issue as ep1_in_urb and is handled in the same\nway.\n\n[1]\nBUG: KASAN: slab-use-after-free in usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96\nWrite of size 4 at addr ffff88803cee1050 by task ktimers/1/29\nCall Trace:\n usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96\n dummy_timer+0xaac/0x4d50 drivers/usb/gadget/udc/dummy_hcd.c:2019\n __run_hrtimer kernel/time/hrtimer.c:2067 [inline]\n __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2124\n hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2141\n\nAllocated by task 36:\n snd_card_new+0x7b/0x110 sound/core/init.c:184\n create_card sound/usb/caiaq/device.c:429 [inline]\n snd_probe+0x236/0x1af0 sound/usb/caiaq/device.c:544\n\nFreed by task 36:\n snd_card_free_when_closed sound/core/init.c:630 [inline]\n snd_card_free+0x138/0x1d0 sound/core/init.c:662\n snd_probe+0x162b/0x1af0 sound/usb/caiaq/device.c:553"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:12:11.824Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a3bbd2845bc7188ae18548a591da1067af997e80"
        },
        {
          "url": "https://git.kernel.org/stable/c/fbfbad728da2e95d6560e43266895de5c8e844b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/dbd3effcbdb85394d3c4bd5ee9df785a44303333"
        },
        {
          "url": "https://git.kernel.org/stable/c/671037b282eb7fe477136bd0130ffd9029eb8668"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6dd3c915b0d02457711d8fbaa60efc52144557f"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c1b907d5db2f3508375776e5b78d69591aa5626"
        },
        {
          "url": "https://git.kernel.org/stable/c/d41e6c1533f09b27fc562260d41417490d2b6084"
        },
        {
          "url": "https://git.kernel.org/stable/c/402a9d6aab7ac787ab075adeb562c3db8b8f564b"
        }
      ],
      "title": "ALSA: caiaq: Decoupling ep1_in_urb in caiaq dev",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98006",
    "datePublished": "2026-09-25T10:23:32.334Z",
    "dateReserved": "2026-09-25T10:19:56.068Z",
    "dateUpdated": "2026-10-19T09:12:11.824Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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