{"cve":"CVE-2026-64369","nvd":{"published":"2026-07-25T10:17:19.743","modified":"2026-09-08T15:05:19.630","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390: Revert support for DCACHE_WORD_ACCESS\n\nload_unaligned_zeropad() reads eight bytes from unaligned addresses and may\ncross page boundaries. It handles exceptions which may happen if reading\nfrom the second page results in an exception.\n\nFor pages which are donated to the Ultravisor for secure execution purposes\nthe do_secure_storage_access() exception handler however does not handle\nsuch exceptions correctly. Such an exception may result in an endless\nexception loop which will never be resolved.\n\nAn attempt to fix this [1] turned out to be not sufficient. For now revert\nload_unaligned_zeropad() until this problem has been resolved in a proper\nway.\n\nNote that the implementation of load_unaligned_zeropad() itself is\ncorrect. The revert is just a temporary workaround until there is complete\nfix for secure storage access exceptions.\n\n[1] commit b00be77302d7 (\"s390/mm: Add missing secure storage access fixups for donated memory\")","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-835"],"references":["https://git.kernel.org/stable/c/37540b8c287fc817bdbd0c62bb75ad6eab0e5d03","https://git.kernel.org/stable/c/be79d285bea70d0edd5015bd487311bfa8cbebc9","https://git.kernel.org/stable/c/c94806905e02cc8e17a69c822d93c41743b7ffc5","https://git.kernel.org/stable/c/c9e0f1517631ac08987f8385817119bccf2f1f12"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:46:40.600842820+00:00"},"epss":{"cve":"CVE-2026-64369","score":0.0013,"percentile":0.02571,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}