CVE-2026-98143
HighCVSS 7.8Summary
In the Linux kernel, the accel/ethosu driver reads bits 15:14 of NPU_SET_{IFM,OFM}_PRECISION as an activation storage mode, but on U65 the same field holds the rounding mode. This causes valid U65 command streams to fail CMDSTREAM_BO_CREATE with -EINVAL and produces bogus feature map size calculations.
Risk Assessment
Valid U65 command streams (e.g. from Mesa for average pooling, concatenation, split, unpack, strided slice, LUT and argmax) fail, causing application errors and potentially incorrect NPU computation results.
Recommendation
Update the Linux kernel to a version with the fix that reads the field as a storage mode only on hardware where it is one (U85), treating it as a rounding mode on U65.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: accel: ethosu: Don't read the U65 rounding mode as a storage mode Bits 15:14 of NPU_SET_{IFM,OFM}_PRECISION select the activation storage mode on U85 only. On U65 the same field holds the rounding mode, and the command stream parser has read it as a storage mode since the driver was added. That went unnoticed while unknown values fell through the switch, but now that they are rejected, every U65 command stream that asks for natural rounding (2) fails CMDSTREAM_BO_CREATE with -EINVAL. Mesa emits it for average pooling, concatenation, split, unpack, strided slice, LUT and argmax, which is 72 failures of the Teflon test suite on an i.MX93. Truncating rounding (1) is misread as well: it picks the two-tile address path and computes a bogus feature map size from tile bases the command stream never set. Read the field as a storage mode only on the hardware where it is one.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS