Strix
26.1K

CVE-2023-53996

CRITICALCVSS 9.3/10EPSS 0.12%

Last modified

CVE-2023-53996 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. 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. EPSS estimates a 0.12% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.3/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability
0.12%

1.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 064ce6c550a0630789978bfec7a13ab2bd1bdcdf, < ba50e7773a99a109a1ea6f753b766a080d3b21cc; >= 064ce6c550a0630789978bfec7a13ab2bd1bdcdf, < 6615212d8e131b45bd9705b0d69cc0d2f624666f; >= 064ce6c550a0630789978bfec7a13ab2bd1bdcdf, < 8ae7457e71a320867d868f2622d7c643596e4f43; >= 064ce6c550a0630789978bfec7a13ab2bd1bdcdf, < ac3f9c9f1b37edaa7d1a9b908bc79d843955a1a2
LinuxLinux5.16

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is 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.
How severe is CVE-2023-53996?
CVE-2023-53996 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 0.12% probability of exploitation in the next 30 days.
How do I fix CVE-2023-53996?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2023

View all 2023CVEs →

Are you affected by CVE-2023-53996?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST