CVE-2026-74498
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 ]
How to fix
- Linux Linux10c24e6fddf4bdff0b6b05a47a4347b38e6960e8, b1770f9ac35c0ffc34914d52347c65dcd5ac049b, 6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c, 3852974608f53e530e27c21d0c6c7d79c17b3f5a, f9b6c9576568169139ac151f7881474f384659fd, 04595233e5606d452f9f47e6989fc7ae7440fd40, bd65b7191683bebd9923904f0558b9211b9129da, d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8fdff6a319e7dac757c558bd283dc4577e68cde7 ≤ v < 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8, 8fdff6a319e7dac757c558bd283dc4577e68cde7 ≤ v < b1770f9ac35c0ffc34914d52347c65dcd5ac049b, 8fdff6a319e7dac757c558bd283dc4577e68cde7 ≤ v < 6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c, 8fdff6a319e7dac757c558bd283dc4577e68cde7 ≤ v < 3852974608f53e530e27c21d0c6c7d79c17b3f5a, 8fdff6a319e7dac757c558bd283dc4577e68cde7 ≤ v < f9b6c9576568169139ac151f7881474f384659fd, 8fdff6a319e7dac757c558bd283dc4577e68cde7 ≤ v < 04595233e5606d452f9f47e6989fc7ae7440fd40, 8fdff6a319e7dac757c558bd283dc4577e68cde7 ≤ v < bd65b7191683bebd9923904f0558b9211b9129da, 8fdff6a319e7dac757c558bd283dc4577e68cde7 ≤ v < d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5, 3.5 | 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8, b1770f9ac35c0ffc34914d52347c65dcd5ac049b, 6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c, 3852974608f53e530e27c21d0c6c7d79c17b3f5a, f9b6c9576568169139ac151f7881474f384659fd, 04595233e5606d452f9f47e6989fc7ae7440fd40, bd65b7191683bebd9923904f0558b9211b9129da, d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5 |
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