UBUNTU-CVE-2026-97589: High severity ubuntu/linux-hwe-edge vulnerability

In the Linux kernel, the following vulnerability has been resolved: s390/crypto: Fix wrong return code to engine in asynch callbacks When cryptofinalizehashrequest() or cryptofinalizeskcipherrequest() explicitly completes a request, the doonerequest callback must return 0 to indicate successful handling. Returning a negative error code causes the crypto engine to assume the driver failed to take ownership and triggers a second completion via cryptorequestcomplete(), resulting in a double completion. This pattern occurs in paess390.c 4 times and once in phmacs390.c. Fixed in phmacdoonerequest() and all four paes doonerequest callbacks (ecb, cbc, ctr, xts) by returning 0 after explicit finalization instead of propagating the error code.