CVE-2025-21835
Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi: fix MIDI Streaming descriptor lengths While the MIDI jacks are configured correctly, and the MIDIStreaming endpoint descriptors are filled with the correct information, bNumEmbMIDIJack and bLength are set incorrectly in these descriptors. This does not matter when the numbers of in and out ports are equal, but when they differ the host will receive broken descriptors with uninitialized stack memory leaking into the descriptor for whichever value is smaller. The precise meaning of "in" and "out" in the port counts is not clearly defined and can be confusing. But elsewhere the driver consistently uses this to match the USB meaning of IN and OUT viewed from the host, so that "in" ports send data to the host and "out" ports receive data from it.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 6.1.129-1 |
| debian | bullseye | fixed | 5.10.237-1 |
| debian | forky | fixed | 6.12.16-1 |
| debian | sid | fixed | 6.12.16-1 |
| debian | trixie | fixed | 6.12.16-1 |
| linux-kernel | affected | 5.4.291 | |
| linux-kernel | 6.14 | affected | |
References
- https://git.kernel.org/stable/c/3a983390d14e8498f303fc5cb23ab7d696b815db
- https://git.kernel.org/stable/c/6ae6dee9f005a2f3b739b85abb6f14a0935699e0
- https://git.kernel.org/stable/c/6b16761a928796e4b49e89a0b1ac284155172726
- https://git.kernel.org/stable/c/9f36a89dcb78cb7e37f487b04a16396ac18c0636
- https://git.kernel.org/stable/c/9f6860a9c11301b052225ca8825f8d2b1a5825bf
- https://git.kernel.org/stable/c/a2d0694e1f111379c1efdf439dadd3cfd959fe9d
- https://git.kernel.org/stable/c/d8e86700c8a8cf415e300a0921acd6a8f9b494f8
- https://git.kernel.org/stable/c/da1668997052ed1cb00322e1f3b63702615c9429
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://www.suse.com/security/cve/CVE-2025-21835.html
- https://security-tracker.debian.org/tracker/CVE-2025-21835
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.