usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg

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Summary

CVECVE-2026-74681
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:42 UTC
Updated2026-08-22 16:16:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: usb: misc: usbio: check ibuf_len against rxbuf_len in bulk msg ibuf_len is the bulk IN (receive) buffer size, but the EMSGSIZE check in usbio_bulk_msg() compares it against txbuf_len — the bulk OUT endpoint size. Both are taken independently from different endpoints in usbio_probe(), so the check is wrong when they differ. Use rxbuf_len for the IN direction. This matches the buffer that actually holds the response data.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 121a0f839dbb397af5fabb701cea3e9983223e50 ebfd1e82ab0a6d26efd9bdd89de899215851f5bf git Not specified
CNA Linux Linux affected 121a0f839dbb397af5fabb701cea3e9983223e50 9ad0164f78b66b0b5eca3a5748cc94dd87e28124 git Not specified
CNA Linux Linux affected 121a0f839dbb397af5fabb701cea3e9983223e50 7e22c9f79b200672f3e477421b6c9050d8cf70a5 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.45 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7e22c9f79b200672f3e477421b6c9050d8cf70a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ebfd1e82ab0a6d26efd9bdd89de899215851f5bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9ad0164f78b66b0b5eca3a5748cc94dd87e28124 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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