CVE-2026-98265
- Source
- https://cve.org/CVERecord?id=CVE-2026-98265
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98265.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-98265
- Downstream
- Related
- Published
- 2026-10-06T08:45:28Z
- Modified
- 2026-10-28T02:31:00Z
- Summary
- ALSA: usb-audio: Clamp implicit feedback packet count to URB capacity
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98265.json" }- References
-
- https://git.kernel.org/stable/c/76a986c980bb502c7688d605ac7a67fd257a9a1b
- https://git.kernel.org/stable/c/79c55a7b5d71cf2a6bbd4bd7698e1b10b70f813a
- https://git.kernel.org/stable/c/8b637ab10e40e01b452f4aff66dad335a9b89a16
- https://git.kernel.org/stable/c/ab77e3f453c5f2499c08d6e8e218501d25bab39e
- https://git.kernel.org/stable/c/ad279ba0dc1781229f5b52f58d38d56960400e06
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98265.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-98265
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedc26bde6301f20d9aafbfb7c2459a88c6a6ec178fFixed8b637ab10e40e01b452f4aff66dad335a9b89a16
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced32a1f64f8ff6e2c5391f5964baec697bce25b83cFixedad279ba0dc1781229f5b52f58d38d56960400e06
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducede949fd266cfa1dcca7caa3faa698578c4ffd26d6Fixed79c55a7b5d71cf2a6bbd4bd7698e1b10b70f813a
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedcf044e44190234a41a788de1cdbb6c21f4a52e1eFixedab77e3f453c5f2499c08d6e8e218501d25bab39eFixed76a986c980bb502c7688d605ac7a67fd257a9a1b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.6.128Fixed6.6.160
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.12.75Fixed6.12.112
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.18.16Fixed6.18.54
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5.15.202Fixed5.16
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.1.165Fixed6.2
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.19.6Fixed6.20
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduceddf75696e70c88b22ed1d8c9d515993a858c58fd0
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3a74f6b46c01d9a816378cd83c327a59f61475ec
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf6fbdf797e016fbf968dd54301026b182175985a
Affected versions
v5.*
v6.*
Linux / Kernel
Package
- Name
- Kernel