CVE-2026-80550

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

s390/vfio_ccw: Fix out of bounds check on CCW array

The routine ccwchaincalclength() counts the number of channel command words (CCWs) that are chained together in a single channel program, and rejects anything larger than CCWCHAINLENMAX (256) CCWs.

The loop itself is "do..while (count < 257)", and while the logic in iscpawithin_range() correctly adjusts between the 0-index array of CCWs and the count of CCWs starting at 1, this means it would look at a possible 257th CCW before ending the loop and (correctly) returning an error.

Fix this by restructuring the loop to break as soon as 256 CCWs (thus indexes 0-255) are examined, without looking at memory outside the range.