Riskcovery

CVE-2023-53996

x86/sev: Make enc_dec_hypercall() accept a size instead of npages

State
Published
Severity
9.3 Critical
Published
Dec 24, 2025
Updated
Aug 5, 2026
Reserved
Dec 24, 2025

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.19.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 064ce6c550a0630789978bfec7a13ab2bd1bdcdf to before ba50e7773a99a109a1ea6f753b766a080d3b21ccAffected
  • 064ce6c550a0630789978bfec7a13ab2bd1bdcdf to before 6615212d8e131b45bd9705b0d69cc0d2f624666fAffected
  • 064ce6c550a0630789978bfec7a13ab2bd1bdcdf to before 8ae7457e71a320867d868f2622d7c643596e4f43Affected
  • 064ce6c550a0630789978bfec7a13ab2bd1bdcdf to before ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2Affected
LinuxLinux
  • 5.16Affected
  • before 5.16Not affected
  • 6.1.53 through 6.1.*Not affected
  • 6.4.16 through 6.4.*Not affected
  • 6.5.3 through 6.5.*Not affected
  • 6.6 and laterNot affected

References

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