Answer in brief
CVE-2026-98265 records a Unknown severity vulnerability in ALSA: usb-audio: Clamp implicit feedback packet count to URB capacity. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=32a1f64f8ff6e2c5391f5964baec697bce25b83c <ad279ba0dc1781229f5b52f58d38d56960400e06 || >=e949fd266cfa1dcca7caa3faa698578c4ffd26d6 <79c55a7b5d71cf2a6bbd4bd7698e1b10b70f813a || >=cf044e44190234a41a788de1cdbb6c21f4a52e1e <ab77e3f453c5f2499c08d6e8e218501d25bab39e || >=cf044e44190234a41a788de1cdbb6c21f4a52e1e <76a986c980bb502c7688d605ac7a67fd257a9a1b || df75696e70c88b22ed1d8c9d515993a858c58fd0 || 3a74f6b46c01d9a816378cd83c327a59f61475ec || c26bde6301f20d9aafbfb7c2459a88c6a6ec178f || f6fbdf797e016fbf968dd54301026b182175985a || >=6.12.75 <6.12.112 || >=6.18.16 <6.18.54 || >=5.15.202 <5.16 || >=6.1.165 <6.2 || >=6.6.128 <6.7 || >=6.19.6 <6.20 | ad279ba0dc1781229f5b52f58d38d56960400e06, 79c55a7b5d71cf2a6bbd4bd7698e1b10b70f813a, ab77e3f453c5f2499c08d6e8e218501d25bab39e, 76a986c980bb502c7688d605ac7a67fd257a9a1b, 6.12.112, 6.18.54, 5.16, 6.2, 6.7, 6.20 |
| Linux/Linuxgeneric | 7.0 | Not reported |
Published upstream
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 6, 2026
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Clamp implicit feedback packet count to URB capacity data_ep_set_params() allocates each data URB for exactly u->packets isochronous frames, so urb->iso_frame_desc[] has u->packets slots and ctx->packets is the driver's only record of that limit. For an implicit feedback sink, snd_usb_queue_pending_output_urbs() overwrites it with the sync source's packet count, which is calculated independently from the capture endpoint's parameters. When that count is larger, prepare_playback_urb() and prepare_silent_urb() can write iso_frame_desc[] past the allocation; their existing bounds limit payload bytes, not the descriptor index. The reproducer uses a high-speed UAC2 device declaring bInterval 1 for implicit feedback capture (8 packets) and bInterval 4 for playback (1 packet). On the first capture completion after the stream starts, it accesses seven descriptors spanning 112 bytes beyond the one-packet URB: BUG: KASAN: slab-out-of-bounds in prepare_playback_urb (sound/usb/pcm.c:1560) Write of size 4 at addr ffff88801e696ad0 by task vhci_rx/178 prepare_playback_urb (sound/usb/pcm.c:1560) prepare_outbound_urb (sound/usb/endpoint.c:340) snd_usb_queue_pending_output_urbs (sound/usb/endpoint.c:501) snd_complete_urb (sound/usb/endpoint.c:1834) __usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1657) usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1741) vhci_rx_loop (drivers/usb/usbip/vhci_rx.c:107) kthread (kernel/kthread.c:436) The buggy address belongs to the object at ffff88801e696a00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes to the right of allocated 208-byte region [ffff88801e696a00, ffff88801e696ad0) Record the allocated packet count per endpoint and clamp both the adopted count and the packet-size copy to it. Fold the Format Type II delimiter into urb_packs before the allocation loop so the recorded limit matches every URB.
Quoted source text, attributed separately from HOL analysis.