CVE-2026-74498
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set When a USB audio endpoint requests full packet transfers via the fill_max descriptor flag, data_ep_set_params()…
Does this matter?
Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published.
Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set When a USB audio endpoint requests full packet transfers via the fill_max descriptor flag, data_ep_set_params() promotes ep->curpacksize to ep->maxpacksize. However, maxsize is left at the original sample-rate derived value. Since u->buffer_size is allocated as maxsize * packets, the resulting DMA buffer is far too small for the requested transfer length. When the USB host controller streams up to curpacksize bytes per packet, it writes past the end of the buffer via DMA, corrupting kernel heap memory. Update maxsize to curpacksize when fill_max is set so that the allocated DMA buffer size matches the actual transfer request size. [ changed to reassign maxsize only when ep->fill_max is set -- tiwai ]
- CVSS
- Not yet scored
- EPSS
- 0.18% probability · 7th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40
- https://git.kernel.org/stable/c/10c24e6fddf4bdff0b6b05a47a4347b38e6960e8
- https://git.kernel.org/stable/c/3852974608f53e530e27c21d0c6c7d79c17b3f5a
- https://git.kernel.org/stable/c/6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c
- https://git.kernel.org/stable/c/b1770f9ac35c0ffc34914d52347c65dcd5ac049b
- https://git.kernel.org/stable/c/bd65b7191683bebd9923904f0558b9211b9129da
- https://git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5
- https://git.kernel.org/stable/c/f9b6c9576568169139ac151f7881474f384659fd
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.