In the Linux kernel, the following vulnerability has been resolved:
s390: Revert support for DCACHE_WORD_ACCESS
load_unaligned_zeropad() reads eight bytes from unaligned addresses and may cross page boundaries. It handles exceptions which may happen if reading from the second page results in an exception.
For pages which are donated to the Ultravisor for secure execution purposes the do_secure_storage_access() exception handler however does not handle such exceptions correctly. Such an exception may result in an endless exception loop which will never be resolved.
An attempt to fix this [1] turned out to be not sufficient. For now revert load_unaligned_zeropad() until this problem has been resolved in a proper way.
Note that the implementation of load_unaligned_zeropad() itself is correct. The revert is just a temporary workaround until there is complete fix for secure storage access exceptions.
[1] commit b00be77302d7 ("s390/mm: Add missing secure storage access fixups for donated memory")
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux-6.12Upgrade linux | Aug 2, 2026 | Aug 2, 2026 |
| Redhat_linux | — | No solution exists | Aug 10, 2026 | Jul 25, 2026 |
| Ubuntu | — | Upgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-virtual-hwe-24.04Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-ibm-7.0Upgrade linux-image-virtual-hwe-26.04Upgrade linux-image-gcp-7.0Upgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-generic-64k-7.0Upgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-ibmUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-virtualUpgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-gcpUpgrade linux-image-7.0.0-31-genericUpgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-nvidiaUpgrade linux-image-gke-hwe-26.04Upgrade linux-image-genericUpgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-generic-hwe-26.04Upgrade linux-image-oem-26.04bUpgrade linux-image-aws-64k-7.0Upgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-realtimeUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-aws-64kUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-nvidia-bosUpgrade linux-image-realtime-hwe-26.04Upgrade linux-image-gke-7.0Upgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-virtual-7.0Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-realtime-7.0Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-nvidia-64kUpgrade linux-image-oem-26.04Upgrade linux-image-oem-7.0Upgrade linux-image-generic-64kUpgrade linux-image-gcp-64kUpgrade linux-image-awsUpgrade linux-image-raspiUpgrade linux-image-realtime-64kUpgrade linux-image-aws-7.0Upgrade linux-image-gke-64k-7.0Upgrade linux-image-gke-64kUpgrade linux-image-generic-7.0Upgrade linux-image-raspi-7.0Upgrade linux-image-gkeUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-7.0.0-1013-oemUpgrade linux-image-7.0.0-1012-awsUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-oem-26.04aUpgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-gcp-64k-7.0 | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 14, 2026 | Jul 25, 2026 |
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