CVE-2026-98312 (GCVE-0-2026-98312)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:46 – Updated: 2026-10-06 08:46
VLAI
Title
ALSA: 6fire: fix OOB write from device-reported iso length
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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 , < 61e665fb48e9eee44ec6d610514af383b1802cc1 (git)
Affected: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 , < 246de677552fe5dede293a1543b632e9853f31e4 (git)
Affected: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 , < 001ba7c1d9677225a5ecbc3e60d4865c08bb21d8 (git)
Affected: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 , < ea11ade10583cc45af515d6b24510dbfa0184ca6 (git)
Affected: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 , < cdc31537012bc7a58c95c6750db321b69dd802bb (git)
Affected: c6d43ba816d1cf1d125bfbfc938f2a28a87facf9 , < 1589afe2d099d3e817873bc474676968d7080410 (git)
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Linux Linux Affected: 2.6.39
Unaffected: 0 , < 2.6.39 (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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      "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": "2026-10-06T08:46:08.388Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        {
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          "url": "https://git.kernel.org/stable/c/ea11ade10583cc45af515d6b24510dbfa0184ca6"
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        {
          "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": "2026-10-06T08:46:08.388Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-10-08",
      "epss": "0.0018",
      "percentile": "0.06948"
    },
    "nvd": {
      "cve": {
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                "product": "Linux",
                "programFiles": [
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                "vendor": "Linux",
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                    "version": "6.12.112",
                    "versionType": "semver"
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                    "version": "7.2.8",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
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        "cveTags": [],
        "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"
          }
        ],
        "id": "CVE-2026-98312",
        "lastModified": "2026-10-06T09:18:22.727",
        "metrics": {},
        "published": "2026-10-06T09:18:22.727",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/001ba7c1d9677225a5ecbc3e60d4865c08bb21d8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1589afe2d099d3e817873bc474676968d7080410"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/246de677552fe5dede293a1543b632e9853f31e4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/61e665fb48e9eee44ec6d610514af383b1802cc1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cdc31537012bc7a58c95c6750db321b69dd802bb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ea11ade10583cc45af515d6b24510dbfa0184ca6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-08T16:47:52Z",
      "cve": "CVE-2026-98312",
      "id": "CVE-2026-98312",
      "initial_release_date": "2026-10-08T16:47:52Z",
      "product_status:known_affected": "301",
      "product_status:known_not_affected": "46",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98312",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98312.json",
      "version": "2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.