What is CVE-2023-53996?

CVE-2023-53996 is a critical-severity vulnerability in Linux. CVSS score: 9.3/10. Published 2025-12-24.

How severe is CVE-2023-53996?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Vulnerability in Linux

CVE-2023-53996

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.

EPSS: 0.001 (1.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Linux — versions 064ce6c550a0630789978bfec7a13ab2bd1bdcdf, 5.16, 0

References

Frequently asked questions

What is CVE-2023-53996?: CVE-2023-53996 is a critical-severity vulnerability in Linux. CVSS score: 9.3/10. Published 2025-12-24.
How severe is CVE-2023-53996?: Critical severity. CVSS v3 base score is 9.3 out of 10.