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Review reviewCritical

CVE-2024-36912

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Track decrypted status in vmbus_gpadl In CoCo VMs it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. In order to make sure callers of vmbus_establish_gpadl() and vmbus_teardown_gpadl() don't return decrypted/shared pages...

CVSS
9.6
EPSS
0.96%
58.0% percentile
CISA KEV
Not listed
Published
2024.05.31
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.96%
Technical severityCVSS 9.6

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Track decrypted status in vmbus_gpadl In CoCo VMs it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. In order to make sure callers of vmbus_establish_gpadl() and vmbus_teardown_gpadl() don't return decrypted/shared pages...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= d4dccf353db80e209f262e3973c834e6e48ba9a9 < 1999644d95194d4a58d3e80ad04ce19220a01a81, >= d4dccf353db80e209f262e3973c834e6e48ba9a9 < 8e62341f5c45b27519b7d193bcc32ada416ad9d8, >= d4dccf353db80e209f262e3973c834e6e48ba9a9 < bfae56be077ba14311509e70706a13458f87ea99, >= d4dccf353db80e209f262e3973c834e6e48ba9a9 < 211f514ebf1ef5de37b1cf6df9d28a56cfd242ca, >= 5.16, >= 5.16 < 6.1.91, >= 6.2 < 6.6.31, >= 6.7 < 6.8.10, 6.9
Fixed versions
6.1.91, 6.6.31, 6.8.10

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel 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:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-1258