{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98312", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.339Z", "datePublished": "2026-10-06T08:46:08.388Z", "dateUpdated": "2026-10-19T09:17:22.807Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:17:22.807Z" }, "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 << 2) * (out_n_analog << 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 < 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->buffer, 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->out_packet_size, the OUT\nendpoint's 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" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "sound/usb/6fire/pcm.c" ], "versions": [ { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "lessThan": "61e665fb48e9eee44ec6d610514af383b1802cc1", "status": "affected", "versionType": "git" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "lessThan": "246de677552fe5dede293a1543b632e9853f31e4", "status": "affected", "versionType": "git" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "lessThan": "001ba7c1d9677225a5ecbc3e60d4865c08bb21d8", "status": "affected", "versionType": "git" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "lessThan": "ea11ade10583cc45af515d6b24510dbfa0184ca6", "status": "affected", "versionType": "git" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "lessThan": "cdc31537012bc7a58c95c6750db321b69dd802bb", "status": "affected", "versionType": "git" }, { "version": "c6d43ba816d1cf1d125bfbfc938f2a28a87facf9", "lessThan": "1589afe2d099d3e817873bc474676968d7080410", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "sound/usb/6fire/pcm.c" ], "versions": [ { "version": "2.6.39", "status": "affected" }, { "version": "0", "lessThan": "2.6.39", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.8", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "6.18.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "7.2.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.39", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }