{ "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": "2026-10-21T12:54:54.873Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:54:54.873Z" }, "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": "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": "df75696e70c88b22ed1d8c9d515993a858c58fd0", "status": "affected", "versionType": "git" }, { "version": "3a74f6b46c01d9a816378cd83c327a59f61475ec", "status": "affected", "versionType": "git" }, { "version": "f6fbdf797e016fbf968dd54301026b182175985a", "status": "affected", "versionType": "git" }, { "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": "5.15.202", "lessThan": "5.16", "status": "affected", "versionType": "semver" }, { "version": "6.1.165", "lessThan": "6.2", "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": "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": "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": "5.15.202" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.165" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.6" } ] } ] } ], "references": [ { "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" } } } }