CVE-2026-74498ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set
Updated under an hour ago ()
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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
- 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
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8fdff6a319e7dac757c558bd283dc4577e68cde7 before 10c24e6fddf4bdff0b6b05a47a4347b38e6960e8; from 8fdff6a319e7dac757c558bd283dc4577e68cde7 before b1770f9ac35c0ffc34914d52347c65dcd5ac049b; 8fdff6a319e7dac757c558bd283dc4577e68cde7 builds before 6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c; from 8fdff6a319e7dac757c558bd283dc4577e68cde7 before 3852974608f53e530e27c21d0c6c7d79c17b3f5a; from 8fdff6a319e7dac757c558bd283dc4577e68cde7 before f9b6c9576568169139ac151f7881474f384659fd; from 8fdff6a319e7dac757c558bd283dc4577e68cde7 before 04595233e5606d452f9f47e6989fc7ae7440fd40; from 8fdff6a319e7dac757c558bd283dc4577e68cde7 before bd65b7191683bebd9923904f0558b9211b9129da; from 8fdff6a319e7dac757c558bd283dc4577e68cde7 before d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5 | CNA record |
References
- https://git.kernel.org/stable/c/10c24e6fddf4bdff0b6b05a47a4347b38e6960e8
- https://git.kernel.org/stable/c/b1770f9ac35c0ffc34914d52347c65dcd5ac049b
- https://git.kernel.org/stable/c/6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c
- https://git.kernel.org/stable/c/3852974608f53e530e27c21d0c6c7d79c17b3f5a
- https://git.kernel.org/stable/c/f9b6c9576568169139ac151f7881474f384659fd
- https://git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40
- https://git.kernel.org/stable/c/bd65b7191683bebd9923904f0558b9211b9129da
- https://git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5
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.