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vuln-cve/data/2026/98xxx/CVE-2026-98836.json
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{
"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": "2026-10-30T12:40:05.522Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:40:05.522Z"
},
"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": "48c76820dd8858ce60a6e42519141ebcf3dfeebf",
"status": "affected",
"versionType": "git"
},
{
"version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692",
"lessThan": "7f31587e26e1d4735924bc324e7fa506d85de150",
"status": "affected",
"versionType": "git"
},
{
"version": "7a0f55aeeb8f1fa32a119d34ddfefc6100936692",
"lessThan": "e3b68b1d92f279e203923dc8bf45c8860e5b5985",
"status": "affected",
"versionType": "git"
},
{
"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": "5.10.273",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.224",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.191",
"lessThanOrEqual": "6.1.*",
"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": "5.10.273"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9",
"versionEndExcluding": "5.15.224"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9",
"versionEndExcluding": "6.1.191"
},
{
"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/48c76820dd8858ce60a6e42519141ebcf3dfeebf"
},
{
"url": "https://git.kernel.org/stable/c/7f31587e26e1d4735924bc324e7fa506d85de150"
},
{
"url": "https://git.kernel.org/stable/c/e3b68b1d92f279e203923dc8bf45c8860e5b5985"
},
{
"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"
}
}
}
}
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