CVE-2025-40269In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix potential overflow of PCM transfer buffer The PCM stream data in USB-audio driver is transferred over USB URB…
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In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix potential overflow of PCM transfer buffer The PCM stream data in USB-audio driver is transferred over USB URB packet buffers, and each packet size is determined dynamically. The packet sizes are limited by some factors such as wMaxPacketSize USB descriptor. OTOH, in the current code, the actually used packet sizes are determined only by the rate and the PPS, which may be bigger than the size limit above. This results in a buffer overflow, as reported by syzbot. Basically when the limit is smaller than the calculated packet size, it implies that something is wrong, most likely a weird USB descriptor. So the best option would be just to return an error at the parameter setup time before doing any further operations. This patch introduces such a sanity check, and returns -EINVAL when the packet size is greater than maxpacksize. The comparison with ep->packsize[1] alone should suffice since it's always equal or greater than ep->packsize[0].
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Deferred
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
No affected products are listed yet.
References
- https://git.kernel.org/stable/c/05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf
- https://git.kernel.org/stable/c/217d47255a2ec8b246f2725f5db9ac3f1d4109d7
- https://git.kernel.org/stable/c/282aba56713bbc58155716b55ca7222b2d9cf3c8
- https://git.kernel.org/stable/c/480a1490c595a242f27493a4544b3efb21b29f6a
- https://git.kernel.org/stable/c/6a5da3fa80affc948923f20a4e086177f505e86e
- https://git.kernel.org/stable/c/98e9d5e33bda8db875cc1a4fe99c192658e45ab6
- https://git.kernel.org/stable/c/ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41
- https://git.kernel.org/stable/c/c4dc012b027c9eb101583011089dea14d744e314
- https://git.kernel.org/stable/c/d2c04f20ccc6c0d219e6d3038bab45bc66a178ad
- https://git.kernel.org/stable/c/d67dde02049e632ba58d3c44a164a74b6a737154
- https://git.kernel.org/stable/c/e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360
- https://git.kernel.org/stable/c/ece3b981bb6620e47fac826a2156c090b1a936a0
- https://git.kernel.org/stable/c/ef592bf2232a2daa9fffa8881881fc9957ea56e9
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.