Answer in brief
CVE-2023-53996 records a Critical severity (CVSS 9.3) vulnerability in x86/sev: Make enc_dec_hypercall() accept a size instead of npages. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 5.16 | Not reported |
| Linux/Linuxgeneric | >=064ce6c550a0630789978bfec7a13ab2bd1bdcdf <ba50e7773a99a109a1ea6f753b766a080d3b21cc || >=064ce6c550a0630789978bfec7a13ab2bd1bdcdf <6615212d8e131b45bd9705b0d69cc0d2f624666f || >=064ce6c550a0630789978bfec7a13ab2bd1bdcdf <8ae7457e71a320867d868f2622d7c643596e4f43 || >=064ce6c550a0630789978bfec7a13ab2bd1bdcdf <ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2 | ba50e7773a99a109a1ea6f753b766a080d3b21cc, 6615212d8e131b45bd9705b0d69cc0d2f624666f, 8ae7457e71a320867d868f2622d7c643596e4f43, ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2 |
Published upstream
Dec 24, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2023-53996 records a Critical severity (CVSS 9.3) vulnerability in x86/sev: Make enc_dec_hypercall() accept a size instead of npages. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | 5.16 | Not reported |
| Linux/Linuxgeneric | >=064ce6c550a0630789978bfec7a13ab2bd1bdcdf <ba50e7773a99a109a1ea6f753b766a080d3b21cc || >=064ce6c550a0630789978bfec7a13ab2bd1bdcdf <6615212d8e131b45bd9705b0d69cc0d2f624666f || >=064ce6c550a0630789978bfec7a13ab2bd1bdcdf <8ae7457e71a320867d868f2622d7c643596e4f43 || >=064ce6c550a0630789978bfec7a13ab2bd1bdcdf <ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2 | ba50e7773a99a109a1ea6f753b766a080d3b21cc, 6615212d8e131b45bd9705b0d69cc0d2f624666f, 8ae7457e71a320867d868f2622d7c643596e4f43, ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2 |
Published upstream
Dec 24, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.