CVE-2026-64369

CVE CVE-2026-64369EUVD EUVD-2026-48913Published 2026-07-25T08:50:22.000Z

What the advisory describes

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")

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 7.1.4; 802ba53eefc592a6a82231f74e19bafe3256f172 <37540b8c287fc817bdbd0c62bb75ad6eab0e5d03; 802ba53eefc592a6a82231f74e19bafe3256f172 <c94806905e02cc8e17a69c822d93c41743b7ffc5; patch: 0; patch: 6.12.97; 6.7; patch: 7.2-rc1; patch: 6.18.39; 802ba53eefc592a6a82231f74e19bafe3256f172 <be79d285bea70d0edd5015bd487311bfa8cbebc9; 802ba53eefc592a6a82231f74e19bafe3256f172 <c9e0f1517631ac08987f8385817119bccf2f1f12

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

Does this concern one of your customers?

This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.

Try it for 28 days

Patchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.