EUVD-2026-66469

In the Linux kernel, the following vulnerability has been resolved: s390/vfioccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary but not architectural limit to the number of CCWs that c...

CVE-2026-80554

A flaw was found in the Linux kernel's s390/vfioccw component. The vfio-ccw logic processes channel programs recursively, breaking them into segments when a Transfer-In-Channel TIC Channel Command Word CCW is encountered. An attacker could exploit the lack of a proper limit on these segments,...

AZL-97772 CVE-2026-80554 affecting package kernel 6.6.150.1-1

In the Linux kernel, the following vulnerability has been resolved: s390/vfioccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary but not architectural limit to the number of CCWs that c...

CVE-2026-80554

In the Linux kernel, the following vulnerability has been resolved: s390/vfioccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary but not architectural limit to the number of CCWs that c...

CVE-2026-80554

In the Linux kernel, the following vulnerability has been resolved: s390/vfioccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary but not architectural limit to the number of CCWs that c...

CVE-2026-80551

In the Linux kernel, the following vulnerability has been resolved: s390/vfioccw: 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...

CVE-2026-80554

CVE-2026-80554 affects the Linux kernel's s390/vfio_ccw subsystem. The root cause is the recursive processing of channel programs: the vfio-ccw logic splits channel programs into segments at each Transfer-In-Channel (TIC) CCW , and the combined segment count contributes to a global limit on CCWs ...

CVE-2026-80554 s390/vfio_ccw: Limit the number of channel program segments

In the Linux kernel, the following vulnerability has been resolved: s390/vfioccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary but not architectural limit to the number of CCWs that c...

CVE-2026-80551 s390/vfio_ccw: Ensure first IDAW remains constant

In the Linux kernel, the following vulnerability has been resolved: s390/vfioccw: 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...

PT-2026-82163

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the s390/vfio ccw component where the CRW region, which relies exclusively on asynchronous events from hardware, lacks a proper locking mechanism. This necessitates th...

PT-2026-82165

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the fsm notoper function within the s390/vfio ccw component. This routine is triggered when a device is lost and is no longer operational. Because this process can occ...

PT-2026-82170

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the s390/vfio ccw component where channel programs and their contained Command Chain Words CCWs are processed recursively. The vfio-ccw logic divides these channel...

PT-2026-82169

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the s390/vfio ccw component where the io work and crw work workqueues were not properly un-initialized. This could allow work to be dispatched after the private...

PT-2026-82168

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the s390/vfio ccw component where the system failed to properly clamp the index for read/write regions to the range of the capabilities. While the capability chain...

PT-2026-82171

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A memory leak occurs in the s390/vfio ccw component when the cp init function fails. While the cp free routine is used to unpin or free memory after successful I/O or when cp prefetch...

Linux Distros Unpatched Vulnerability : CVE-2026-80554

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - s390/vfioccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is ...

PT-2026-82167

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the s390/vfio ccw component where the first Indirect Data Address Word IDAW in a list is read separately to calculate the buffer size for the full Indirect Data Addres...

PT-2026-82164

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A race condition exists in the s390/vfio ccw component. The io mutex was originally intended to serialize io regions but became associated with I/O operations due to their close...

UBUNTU-CVE-2022-50307

In the Linux kernel, the following vulnerability has been resolved: s390/cio: fix out-of-bounds access on cioignore free The channel-subsystem-driver scans for newly available devices whenever device-IDs are removed from the cioignore list using a command such as: echo free /proc/cioignore Since ...

GSD-2022-1005216 vfio/ccw: Remove UUID from s390 debug log

vfio/ccw: Remove UUID from s390 debug log This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.19.2 by commit...