CVE-2026-98143 accel: ethosu: Don't read the U65 rounding mode as a storage mode
A logic error in the Linux kernel Ethos-U driver causes valid command streams to fail, leading to denial of service for userspace applications.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98143?
CVE-2026-98143 is a high-severity vulnerability in Linux kernel, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-681
Which versions are affected by CVE-2026-98143?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-98143?
Apply the vendor's patch.
Is CVE-2026-98143 being exploited?
There is no known exploitation of CVE-2026-98143 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-98143, GHSA-m67f-86jg-mhm5, UBUNTU-CVE-2026-98143.