{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98836", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.372Z", "datePublished": "2026-10-18T15:49:51.823Z", "dateUpdated": "2026-10-21T12:57:22.028Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:57:22.028Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: line6: reject oversized playback packets\n\nEach playback URB is handed a slice of out.buffer that is exactly\nLINE6_ISO_PACKETS * max_packet_size_out bytes, sized from the OUT\nendpoint, but the number of bytes written into that slice is never\ncompared against it.\n\nsubmit_audio_out_urb() takes the frame count from prev_fsize, which\naudio_in_callback() derived from the *IN* endpoint's received packet\nlength, and rescales it with the playback frame size; when prev_fsize is\nstill zero it synthesizes a length from the sample rate instead. On a\ndevice declaring a large IN wMaxPacketSize and a small OUT\nwMaxPacketSize, the resulting memcpy(), or the memset() when the\nplayback stream is idle, runs past its slice and, as the reproducer\nbelow shows, beyond the allocation.\n\nusb_submit_urb() is not a backstop. max_packet_size_out comes from\nusb_maxpacket(), which returns only the low 11 bits of wMaxPacketSize,\nwhile USB core validates a high-speed isochronous length against that\nbase scaled by usb_endpoint_maxp_mult(). A length of up to three times\nthe allocated slice is therefore accepted, and even a rejected URB is\nonly rejected after the write.\n\nReject a packet that does not fit the slice the driver allocated for it.\nClamping it instead would silently shorten the capture-derived rate\nfeedback and desynchronize the two streams.\n\n BUG: KASAN: slab-out-of-bounds in submit_audio_out_urb (sound/usb/line6/playback.c:229)\n Write of size 1024 at addr ffff888100bbd400 by task kworker/1:2/5002\n Workqueue: events line6_startup_work\n Call Trace:\n __asan_memcpy (mm/kasan/shadow.c:106)\n submit_audio_out_urb (sound/usb/line6/playback.c:229)\n line6_submit_audio_out_all_urbs (sound/usb/line6/playback.c:291)\n line6_stream_start (sound/usb/line6/pcm.c:194)\n line6_pcm_acquire (sound/usb/line6/pcm.c:337)\n line6_startup_work (sound/usb/line6/driver.c:728)\n process_one_work (kernel/workqueue.c:3396)\n worker_thread (kernel/workqueue.c:3479 kernel/workqueue.c:3560)\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 The buggy address belongs to the object at ffff888100bbd400\n which belongs to the cache kmalloc-256 of size 256\n The buggy address is located 0 bytes inside of\n allocated 256-byte region [ffff888100bbd400, ffff888100bbd500)" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "sound/usb/line6/playback.c" ], "versions": [ { "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692", "lessThan": "933d8ac23388eb208ea195231d682dce0bec86ca", "status": "affected", "versionType": "git" }, { "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692", "lessThan": "a84371be89c39ccc46c7af8b9eb15c448df9265f", "status": "affected", "versionType": "git" }, { "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692", "lessThan": "3f75da1e4ee699f6650d23d6897cf443b01856c7", "status": "affected", "versionType": "git" }, { "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692", "lessThan": "b78748424f29f07d310484b2b36afdececa74389", "status": "affected", "versionType": "git" }, { "version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692", "lessThan": "61b0a5a114fa4552892da5c0ff2f42e63bf08c6b", "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/line6/playback.c" ], "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.10", "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": "4.9", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.12.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.18.56" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.2.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/933d8ac23388eb208ea195231d682dce0bec86ca" }, { "url": "https://git.kernel.org/stable/c/a84371be89c39ccc46c7af8b9eb15c448df9265f" }, { "url": "https://git.kernel.org/stable/c/3f75da1e4ee699f6650d23d6897cf443b01856c7" }, { "url": "https://git.kernel.org/stable/c/b78748424f29f07d310484b2b36afdececa74389" }, { "url": "https://git.kernel.org/stable/c/61b0a5a114fa4552892da5c0ff2f42e63bf08c6b" } ], "title": "ALSA: line6: reject oversized playback packets", "x_generator": { "engine": "bippy-1.2.0" } } } }