Riskcovery

CVE-2024-36909

Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted

State
Published
Severity
9.3 Critical
Published
May 30, 2024
Updated
Aug 5, 2026
Reserved
May 30, 2024

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted

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.

The VMBus ring buffer code could free decrypted/shared pages if set_memory_decrypted() fails. Check the decrypted field in the struct vmbus_gpadl for the ring buffers to decide whether to free the memory.

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
  • d4dccf353db80e209f262e3973c834e6e48ba9a9 to before 2f622008bf784a9f5dd17baa19223cc2ac30a039Affected
  • d4dccf353db80e209f262e3973c834e6e48ba9a9 to before 82f9e213b124a7d2bb5b16ea35d570260ef467e0Affected
  • d4dccf353db80e209f262e3973c834e6e48ba9a9 to before a9212a4e2963a7fbe3864ba33dc551d4ad8d0abbAffected
  • d4dccf353db80e209f262e3973c834e6e48ba9a9 to before 30d18df6567be09c1433e81993e35e3da573ac48Affected
LinuxLinux
  • 5.16Affected
  • before 5.16Not affected
  • 6.1.91 through 6.1.*Not affected
  • 6.6.31 through 6.6.*Not affected
  • 6.8.10 through 6.8.*Not affected
  • 6.9 and laterNot affected

References

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