CVE-2026-64369

UNRATEDCVSS · not yet scored
—
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS v2: —Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
—
EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
—
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

July 25, 2026

Last Modified

August 17, 2026

References (4)

Vendor Advisories for CVE-2026-64369(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux-6.12—6.12.100-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.96-1 (31 versions)6.12.100-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (156 versions)7.1.4-1—

Data Freshness Timeline

(refreshed 6× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-30 00:08 UTCGHSA enrichment
  3. 2026-08-28 21:42 UTCEPSS rescore
  4. 2026-08-26 14:47 UTCEPSS rescore
  5. 2026-08-26 03:45 UTCGHSA enrichment
  6. 2026-08-25 13:49 UTCEPSS rescore
  7. 2026-08-23 04:17 UTCGHSA enrichment
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-21 23:49 UTCEPSS rescore
  10. 2026-08-20 04:48 UTCGHSA enrichment
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 05:25 UTCNVD update
  15. 2026-08-17 05:19 UTCGHSA enrichment
  16. 2026-08-17 05:05 UTCMITRE cvelistV5
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 14:36 UTCGHSA enrichment
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-12 13:51 UTCEPSS rescore
  22. 2026-08-11 15:07 UTCGHSA enrichment
  23. 2026-08-11 00:00 UTCEPSS rescore
  24. 2026-08-10 00:16 UTCGHSA enrichment
  25. 2026-08-09 13:47 UTCEPSS rescore
Show 29 more
  1. 2026-08-08 16:37 UTCEPSS rescore
  2. 2026-08-07 00:47 UTCGHSA enrichment
  3. 2026-08-06 13:47 UTCEPSS rescore
  4. 2026-08-05 19:17 UTCEPSS rescore
  5. 2026-08-05 19:17 UTCEPSS rescore
  6. 2026-08-04 15:10 UTCEPSS rescore
  7. 2026-08-04 10:39 UTCEPSS rescore
  8. 2026-08-04 01:19 UTCGHSA enrichment
  9. 2026-08-03 10:36 UTCEPSS rescore
  10. 2026-08-02 02:27 UTCEPSS rescore
  11. 2026-08-01 04:16 UTCEPSS rescore
  12. 2026-08-01 01:50 UTCEG score recompute
  13. 2026-08-01 01:50 UTCGHSA enrichment
  14. 2026-07-30 16:28 UTCEPSS rescore
  15. 2026-07-30 01:30 UTCEPSS rescore
  16. 2026-07-30 01:30 UTCEPSS rescore
  17. 2026-07-29 02:19 UTCEG score recompute
  18. 2026-07-29 02:19 UTCGHSA enrichment
  19. 2026-07-28 15:37 UTCEPSS rescore
  20. 2026-07-27 14:14 UTCEPSS rescore
  21. 2026-07-26 14:54 UTCEPSS rescore
  22. 2026-07-26 14:54 UTCEPSS rescore
  23. 2026-07-26 02:49 UTCEG score recompute
  24. 2026-07-26 02:49 UTCGHSA enrichment
  25. 2026-07-25 14:18 UTCEPSS rescore
  26. 2026-07-25 14:18 UTCEPSS rescore
  27. 2026-07-25 10:39 UTCNVD update
  28. 2026-07-25 09:35 UTCEG score recompute
  29. 2026-07-25 09:21 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-64369?
CVE-2026-64369 is a publicly disclosed vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: s390: Revert support for DCACHEWORDACCESS loadunalignedzeropad() 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…
When was CVE-2026-64369 disclosed?
CVE-2026-64369 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64369 actively exploited?
CVE-2026-64369 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.3% of all scored CVEs.
How do I remediate CVE-2026-64369?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64369, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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