Critical 9.3Published Dec 24, 2025

CVE-2023-53996x86/sev: Make enc_dec_hypercall() accept a size instead of npages

Updated under an hour ago (Oct 27, 2026, 4:00 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: x86/sev: Make enc_dec_hypercall() accept a size instead of npages enc_dec_hypercall() accepted a page count instead of a size, which forced its callers to round up. As a result, non-page aligned vaddrs caused pages to be spuriously marked as decrypted via the encryption status hypercall, which in turn caused consistent corruption of pages during live migration. Live migration requires accurate encryption status information to avoid migrating pages from the wrong perspective.

CVSS: 9.3 CRITICAL (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 064ce6c550a0630789978bfec7a13ab2bd1bdcdf before ba50e7773a99a109a1ea6f753b766a080d3b21cc; from 064ce6c550a0630789978bfec7a13ab2bd1bdcdf before 6615212d8e131b45bd9705b0d69cc0d2f624666f; 064ce6c550a0630789978bfec7a13ab2bd1bdcdf builds before 8ae7457e71a320867d868f2622d7c643596e4f43; from 064ce6c550a0630789978bfec7a13ab2bd1bdcdf before ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2	CNA record

References

References

https://git.kernel.org/stable/c/ba50e7773a99a109a1ea6f753b766a080d3b21cc
https://git.kernel.org/stable/c/6615212d8e131b45bd9705b0d69cc0d2f624666f
https://git.kernel.org/stable/c/8ae7457e71a320867d868f2622d7c643596e4f43
https://git.kernel.org/stable/c/ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.