ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set

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Summary

CVECVE-2026-74498
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:54 UTC
Updated2026-08-15 13:17:54 UTC
DescriptionIn 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 ]

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8fdff6a319e7dac757c558bd283dc4577e68cde7 3852974608f53e530e27c21d0c6c7d79c17b3f5a git Not specified
CNA Linux Linux affected 8fdff6a319e7dac757c558bd283dc4577e68cde7 f9b6c9576568169139ac151f7881474f384659fd git Not specified
CNA Linux Linux affected 8fdff6a319e7dac757c558bd283dc4577e68cde7 04595233e5606d452f9f47e6989fc7ae7440fd40 git Not specified
CNA Linux Linux affected 8fdff6a319e7dac757c558bd283dc4577e68cde7 bd65b7191683bebd9923904f0558b9211b9129da git Not specified
CNA Linux Linux affected 8fdff6a319e7dac757c558bd283dc4577e68cde7 d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5 git Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd65b7191683bebd9923904f0558b9211b9129da 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9b6c9576568169139ac151f7881474f384659fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3852974608f53e530e27c21d0c6c7d79c17b3f5a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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