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vuln-cve/data/2026/98xxx/CVE-2026-98265.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-98265",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-25T10:25:14.333Z",
"datePublished": "2026-10-06T08:45:28.438Z",
"dateUpdated": "2026-10-30T12:38:00.448Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-30T12:38:00.448Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Clamp implicit feedback packet count to URB capacity\n\ndata_ep_set_params() allocates each data URB for exactly u->packets\nisochronous frames, so urb->iso_frame_desc[] has u->packets slots and\nctx->packets is the driver's only record of that limit. For an implicit\nfeedback sink, snd_usb_queue_pending_output_urbs() overwrites it with the\nsync source's packet count, which is calculated independently from the\ncapture endpoint's parameters. When that count is larger,\nprepare_playback_urb() and prepare_silent_urb() can write\niso_frame_desc[] past the allocation; their existing bounds limit payload\nbytes, not the descriptor index.\n\nThe reproducer uses a high-speed UAC2 device declaring bInterval 1 for\nimplicit feedback capture (8 packets) and bInterval 4 for playback\n(1 packet). On the first capture completion after the stream starts, it\naccesses seven descriptors spanning 112 bytes beyond the one-packet URB:\n\n BUG: KASAN: slab-out-of-bounds in prepare_playback_urb (sound/usb/pcm.c:1560)\n Write of size 4 at addr ffff88801e696ad0 by task vhci_rx/178\n prepare_playback_urb (sound/usb/pcm.c:1560)\n prepare_outbound_urb (sound/usb/endpoint.c:340)\n snd_usb_queue_pending_output_urbs (sound/usb/endpoint.c:501)\n snd_complete_urb (sound/usb/endpoint.c:1834)\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)\n kthread (kernel/kthread.c:436)\n The buggy address belongs to the object at ffff88801e696a00\n which belongs to the cache kmalloc-256 of size 256\n The buggy address is located 0 bytes to the right of\n allocated 208-byte region [ffff88801e696a00, ffff88801e696ad0)\n\nRecord the allocated packet count per endpoint and clamp both the adopted\ncount and the packet-size copy to it. Fold the Format Type II delimiter\ninto urb_packs before the allocation loop so the recorded limit matches\nevery URB."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"sound/usb/card.h",
"sound/usb/endpoint.c"
],
"versions": [
{
"version": "df75696e70c88b22ed1d8c9d515993a858c58fd0",
"lessThan": "6c5c986f761756a6ff7b3aea51c11994fc2464e5",
"status": "affected",
"versionType": "git"
},
{
"version": "3a74f6b46c01d9a816378cd83c327a59f61475ec",
"lessThan": "e44cee1bf51e606f3e70a213eb5a1abb3fa56a81",
"status": "affected",
"versionType": "git"
},
{
"version": "c26bde6301f20d9aafbfb7c2459a88c6a6ec178f",
"lessThan": "8b637ab10e40e01b452f4aff66dad335a9b89a16",
"status": "affected",
"versionType": "git"
},
{
"version": "32a1f64f8ff6e2c5391f5964baec697bce25b83c",
"lessThan": "ad279ba0dc1781229f5b52f58d38d56960400e06",
"status": "affected",
"versionType": "git"
},
{
"version": "e949fd266cfa1dcca7caa3faa698578c4ffd26d6",
"lessThan": "79c55a7b5d71cf2a6bbd4bd7698e1b10b70f813a",
"status": "affected",
"versionType": "git"
},
{
"version": "cf044e44190234a41a788de1cdbb6c21f4a52e1e",
"lessThan": "ab77e3f453c5f2499c08d6e8e218501d25bab39e",
"status": "affected",
"versionType": "git"
},
{
"version": "cf044e44190234a41a788de1cdbb6c21f4a52e1e",
"lessThan": "76a986c980bb502c7688d605ac7a67fd257a9a1b",
"status": "affected",
"versionType": "git"
},
{
"version": "f6fbdf797e016fbf968dd54301026b182175985a",
"status": "affected",
"versionType": "git"
},
{
"version": "5.15.202",
"lessThan": "5.15.224",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.1.165",
"lessThan": "6.1.191",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.6.128",
"lessThan": "6.6.160",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.12.75",
"lessThan": "6.12.112",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.18.16",
"lessThan": "6.18.54",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.19.6",
"lessThan": "6.20",
"status": "affected",
"versionType": "semver"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"sound/usb/card.h",
"sound/usb/endpoint.c"
],
"versions": [
{
"version": "7.0",
"status": "affected"
},
{
"version": "0",
"lessThan": "7.0",
"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": "6.12.112",
"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": "5.15.202",
"versionEndExcluding": "5.15.224"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.1.165",
"versionEndExcluding": "6.1.191"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.6.128",
"versionEndExcluding": "6.6.160"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.12.75",
"versionEndExcluding": "6.12.112"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.18.16",
"versionEndExcluding": "6.18.54"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "7.0",
"versionEndExcluding": "7.2.8"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "7.0",
"versionEndExcluding": "7.3"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.19.6"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/6c5c986f761756a6ff7b3aea51c11994fc2464e5"
},
{
"url": "https://git.kernel.org/stable/c/e44cee1bf51e606f3e70a213eb5a1abb3fa56a81"
},
{
"url": "https://git.kernel.org/stable/c/8b637ab10e40e01b452f4aff66dad335a9b89a16"
},
{
"url": "https://git.kernel.org/stable/c/ad279ba0dc1781229f5b52f58d38d56960400e06"
},
{
"url": "https://git.kernel.org/stable/c/79c55a7b5d71cf2a6bbd4bd7698e1b10b70f813a"
},
{
"url": "https://git.kernel.org/stable/c/ab77e3f453c5f2499c08d6e8e218501d25bab39e"
},
{
"url": "https://git.kernel.org/stable/c/76a986c980bb502c7688d605ac7a67fd257a9a1b"
}
],
"title": "ALSA: usb-audio: Clamp implicit feedback packet count to URB capacity",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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