Description
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Ensure first IDAW remains constant The first IDAW in a list does not need to be on a 2K/4K boundary like all others, and so is read separately to accurately calculate the size of the buffer needed to read the full IDAL. Verify that the address found in the first IDAW is unchanged between reads, to ensure a consistent set of IDAWs being worked with.
References6
- git.kernel.org/stable/c/08ef2a82115690d6e229615872ac1731af732497
- git.kernel.org/stable/c/0d46c2565f173bcddcdcaf44a4f69789a20535e2
- git.kernel.org/stable/c/460b977a4e71cc319fdadf91c193ec3beaa57263
- git.kernel.org/stable/c/565bef268d75bf7df665bce6923a88cd0eb74592
- git.kernel.org/stable/c/5b7c23440343e336259cd45017cc901a744c41b0
- git.kernel.org/stable/c/fc59e9482117ebdccd6dc7fa8082f8b980fd021e
Metrics
- CVSS 3.1
-
9.3
CRITICAL
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 4 · as of 9 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.