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Review reviewCritical

CVE-2023-53996

Linux

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
EPSS
0.10%
0.96% percentile
CISA KEV
Not listed
Published
2025.12.24
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.10%
Technical severityCVSS 9.3

Vulnerability overview

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.

Affected product and versions

Product
Linux
Affected versions
>= 064ce6c550a0630789978bfec7a13ab2bd1bdcdf < ba50e7773a99a109a1ea6f753b766a080d3b21cc, >= 064ce6c550a0630789978bfec7a13ab2bd1bdcdf < 6615212d8e131b45bd9705b0d69cc0d2f624666f, >= 064ce6c550a0630789978bfec7a13ab2bd1bdcdf < 8ae7457e71a320867d868f2622d7c643596e4f43, >= 064ce6c550a0630789978bfec7a13ab2bd1bdcdf < ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2, >= 5.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
Not available