CVE-2026-98312 (GCVE-0-2026-98312)
Vulnerability from cvelistv5
Published
2026-10-06 08:46
Modified
2026-10-19 09:17
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: 6fire: fix OOB write from device-reported iso length usb6fire_pcm_in_urb_handler() sizes each outgoing isochronous packet as (actual_length - 4) / (in_n_analog << 2) * (out_n_analog << 2) + 4, where actual_length is the unsigned length the device reported for the matching IN packet. A packet completed with status 0 and actual_length < 4 wraps the subtraction to 0x7fffffec; a zero-length isochronous packet is legal on the bus, and the preceding loop rejects only non-zero status. The sum reaches memset() on out_urb->buffer, a 4832-byte object from kcalloc(PCM_MAX_PACKET_SIZE, PCM_N_PACKETS_PER_URB). Even without the wrap the result is out of bounds: at 88.2/96 kHz the 4-in/6-out scaling turns a full 420-byte IN packet into 628, so eight packets span 5024 bytes of that buffer. usb_submit_urb() rejects an over-long descriptor only after the memset() and the usb6fire_pcm_playback() copy of user PCM data have run. Guard the subtraction as the sibling usb6fire_pcm_capture() already does, and limit the frame count to what fits in rt->out_packet_size, the OUT endpoint's wMaxPacketSize. This bounds total_length by the buffer size while keeping each packet length aligned to a whole output frame. BUG: KASAN: out-of-bounds in usb6fire_pcm_in_urb_handler (sound/usb/6fire/pcm.c:338) Write of size 18446744073709551456 at addr ffff88802a3d0000 by task vhci_rx/5018 Call Trace: dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120) print_report (mm/kasan/report.c:378 mm/kasan/report.c:482) kasan_report (mm/kasan/report.c:595) kasan_check_range (mm/kasan/generic.c:186 mm/kasan/generic.c:200) __asan_memset (mm/kasan/shadow.c:84) usb6fire_pcm_in_urb_handler (sound/usb/6fire/pcm.c:338) __usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1657) usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1741) vhci_rx_loop (drivers/usb/usbip/vhci_rx.c:107 drivers/usb/usbip/vhci_rx.c:242) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) Allocated by task 10: __kmalloc_cache_noprof (mm/slub.c:5563) usb6fire_pcm_init (sound/usb/6fire/pcm.c:560 sound/usb/6fire/pcm.c:595) usb6fire_chip_probe (sound/usb/6fire/chip.c:133) usb_probe_interface (drivers/usb/core/driver.c:399) The buggy address belongs to the object at ffff88802a3d0000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 0 bytes inside of 4832-byte region [ffff88802a3d0000, ffff88802a3d12e0) Kernel panic - not syncing: Fatal exception in interrupt
References
Impacted products
Vendor Product Version
Linux Linux Version: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9
Version: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9
Version: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9
Version: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9
Version: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9
Version: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/6fire/pcm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "61e665fb48e9eee44ec6d610514af383b1802cc1",
              "status": "affected",
              "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9",
              "versionType": "git"
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            {
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              "versionType": "git"
            },
            {
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              "versionType": "git"
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            {
              "lessThan": "cdc31537012bc7a58c95c6750db321b69dd802bb",
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              "versionType": "git"
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            {
              "lessThan": "1589afe2d099d3e817873bc474676968d7080410",
              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "sound/usb/6fire/pcm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.39"
            },
            {
              "lessThan": "2.6.39",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "2.6.39",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "2.6.39",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "2.6.39",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.54",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.8",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: 6fire: fix OOB write from device-reported iso length\n\nusb6fire_pcm_in_urb_handler() sizes each outgoing isochronous packet as\n(actual_length - 4) / (in_n_analog \u003c\u003c 2) * (out_n_analog \u003c\u003c 2) + 4, where\nactual_length is the unsigned length the device reported for the matching\nIN packet.  A packet completed with status 0 and actual_length \u003c 4 wraps\nthe subtraction to 0x7fffffec; a zero-length isochronous packet is legal\non the bus, and the preceding loop rejects only non-zero status.  The sum\nreaches memset() on out_urb-\u003ebuffer, a 4832-byte object from\nkcalloc(PCM_MAX_PACKET_SIZE, PCM_N_PACKETS_PER_URB).\n\nEven without the wrap the result is out of bounds: at 88.2/96 kHz the\n4-in/6-out scaling turns a full 420-byte IN packet into 628, so eight\npackets span 5024 bytes of that buffer.  usb_submit_urb() rejects an\nover-long descriptor only after the memset() and the\nusb6fire_pcm_playback() copy of user PCM data have run.\n\nGuard the subtraction as the sibling usb6fire_pcm_capture() already does,\nand limit the frame count to what fits in rt-\u003eout_packet_size, the OUT\nendpoint\u0027s wMaxPacketSize.  This bounds total_length by the buffer size\nwhile keeping each packet length aligned to a whole output frame.\n\n  BUG: KASAN: out-of-bounds in usb6fire_pcm_in_urb_handler (sound/usb/6fire/pcm.c:338)\n  Write of size 18446744073709551456 at addr ffff88802a3d0000 by task vhci_rx/5018\n  Call Trace:\n   dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)\n   print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)\n   kasan_report (mm/kasan/report.c:595)\n   kasan_check_range (mm/kasan/generic.c:186 mm/kasan/generic.c:200)\n   __asan_memset (mm/kasan/shadow.c:84)\n   usb6fire_pcm_in_urb_handler (sound/usb/6fire/pcm.c:338)\n   __usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1657)\n   usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1741)\n   vhci_rx_loop (drivers/usb/usbip/vhci_rx.c:107 drivers/usb/usbip/vhci_rx.c:242)\n   kthread (kernel/kthread.c:436)\n   ret_from_fork (arch/x86/kernel/process.c:158)\n   ret_from_fork_asm (arch/x86/entry/entry_64.S:245)\n\n  Allocated by task 10:\n   __kmalloc_cache_noprof (mm/slub.c:5563)\n   usb6fire_pcm_init (sound/usb/6fire/pcm.c:560 sound/usb/6fire/pcm.c:595)\n   usb6fire_chip_probe (sound/usb/6fire/chip.c:133)\n   usb_probe_interface (drivers/usb/core/driver.c:399)\n\n  The buggy address belongs to the object at ffff88802a3d0000\n   which belongs to the cache kmalloc-8k of size 8192\n  The buggy address is located 0 bytes inside of\n   4832-byte region [ffff88802a3d0000, ffff88802a3d12e0)\n  Kernel panic - not syncing: Fatal exception in interrupt"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:17:22.807Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/61e665fb48e9eee44ec6d610514af383b1802cc1"
        },
        {
          "url": "https://git.kernel.org/stable/c/246de677552fe5dede293a1543b632e9853f31e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/001ba7c1d9677225a5ecbc3e60d4865c08bb21d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea11ade10583cc45af515d6b24510dbfa0184ca6"
        },
        {
          "url": "https://git.kernel.org/stable/c/cdc31537012bc7a58c95c6750db321b69dd802bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/1589afe2d099d3e817873bc474676968d7080410"
        }
      ],
      "title": "ALSA: 6fire: fix OOB write from device-reported iso length",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98312",
    "datePublished": "2026-10-06T08:46:08.388Z",
    "dateReserved": "2026-09-25T10:25:14.339Z",
    "dateUpdated": "2026-10-19T09:17:22.807Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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