CVE-2023-53996 (GCVE-0-2023-53996)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:55 – Updated: 2026-05-11 19:53
VLAI
Title
x86/sev: Make enc_dec_hypercall() accept a size instead of npages
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 064ce6c550a0630789978bfec7a13ab2bd1bdcdf , < ba50e7773a99a109a1ea6f753b766a080d3b21cc (git)
Affected: 064ce6c550a0630789978bfec7a13ab2bd1bdcdf , < 6615212d8e131b45bd9705b0d69cc0d2f624666f (git)
Affected: 064ce6c550a0630789978bfec7a13ab2bd1bdcdf , < 8ae7457e71a320867d868f2622d7c643596e4f43 (git)
Affected: 064ce6c550a0630789978bfec7a13ab2bd1bdcdf , < ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2 (git)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.53 , ≤ 6.1.* (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.