{ "cveId": "CVE-2026-74682", "url": "https://patchblox.com/security/cve/CVE-2026-74682", "summary": "CVE-2026-74682 is fixed in 50 products on 1 platform, first by DEBIAN-CVE-2026-74682, released August 27, 2026. It is not reported as exploited. Patch Radar priority: High.", "title": "ALSA: usb-audio: fix OOB write on Type II inbound URBs", "description": "In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: fix OOB write on Type II inbound URBs data_ep_set_params() sizes each URB transfer buffer before it adds the Format Type II transfer delimiter: \tu-\u003Epackets = urb_packs; \tu-\u003Ebuffer_size = maxsize * u-\u003Epackets; \tif (fmt-\u003Efmt_type == UAC_FORMAT_TYPE_II) \t\tu-\u003Epackets\u002B\u002B; /* for transfer delimiter */ \tu-\u003Eurb = usb_alloc_urb(u-\u003Epackets, GFP_KERNEL); buffer_size is computed from the pre-increment packet count and never recomputed, so for a Type II endpoint the buffer is one packet short of the packet count the URB is built with. prepare_inbound_urb() then lays out one iso frame per packet and never consults buffer_size: \toffs = 0; \tfor (i = 0; i \u003C urb_ctx-\u003Epackets; i\u002B\u002B) { \t\turb-\u003Eiso_frame_desc[i].offset = offs; \t\turb-\u003Eiso_frame_desc[i].length = ep-\u003Ecurpacksize; \t\toffs \u002B= ep-\u003Ecurpacksize; \t} \turb-\u003Etransfer_buffer_length = offs; \turb-\u003Enumber_of_packets = urb_ctx-\u003Epackets; The last descriptor therefore points one packet past the end of the transfer buffer, where the host controller writes device data on every inbound transfer. prepare_silent_urb() and prepare_playback_urb() bound their fill loops by ctx-\u003Ebuffer_size, so only capture is affected. fmt_type comes from the device\u0027s audio streaming descriptors, so any device advertising a Type II capture format hits this once userspace sets hw_params on the stream. KASAN on 7.2.0-rc5 (arm64) with a dummy_hcd/raw-gadget device, one report per inbound transfer: BUG: KASAN: slab-out-of-bounds in dummy_timer Write of size 64 at addr ffff0000186171c0 by task cons02/166 __asan_memcpy dummy_timer hrtimer_run_softirq Allocated by task 166: usb_alloc_coherent snd_usb_endpoint_set_params The buggy address is located 0 bytes to the right of allocated 64-byte region [ffff000018617180, ffff0000186171c0) Compute buffer_size after the delimiter packet has been accounted for, and bound the fill loop by buffer_size, as prepare_silent_urb() already does on the outbound side. This grows every Type II URB allocation by one maxsize packet. Discovered by XBOW, triaged by Baul Lee \u003Cbaul.lee@xbow.com\u003E", "published": "2026-08-22T16:16:42Z", "severity": "Moderate", "cvss": 7, "epss": 0.00177, "epssPercentile": 0.07262, "priority": "High", "priorityTier": 3, "exploited": false, "vendorExploited": false, "disclosed": false, "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74682", "fixes": [ { "platform": "linux", "product": "bpftool", "release": "ol 8", "fixedVersion": "0:5.15.0-324.217.5.2.el9uek", "fix": "ELSA-2026-500249", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500249", "released": "2026-09-04T00:00:00Z" }, { "platform": "linux", "product": "bpftool", "release": "ol 9", "fixedVersion": "0:5.15.0-324.217.5.2.el9uek", "fix": "ELSA-2026-500249", "url": "https://patchblox.com/security/fix/linux/elsa-2026-500249", "released": "2026-09-04T00:00:00Z" }, { "platform": "linux", "product": "kernel-64kb", "release": "sles 15.7", "fixedVersion": "6.4.0-150700.53.90.1", 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