CVE-2026-97990

In the Linux kernel, the following vulnerability has been resolved:

vdpa sim net: check TX pull result before RX copy

vringh iov pull iotlb() returns a signed byte count. A failed TX pull is currently added to the unsigned byte counter and then passed as a size t length to receive filter() and vringh iov push iotlb(). A negative error can therefore become a large length in the RX path.

Handle non-positive pull results before every length use. Count the TX error and complete the consumed TX descriptor with zero bytes.

I found this bug myself, though the patch was written with AI assistance.