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CVE-2024-36909

Linux Kernel vulnerability

9.3 CRITICALEPSS 0.24%
  1. Published30 May 2024

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.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Linux Kernel≥ 6.2 < 6.6.31 · ≥ 6.7 < 6.8.10 · < 6.1.91 · 6.9

Remediation

Fixed in
Linux Kernel≥ 6.6.31

References

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Frequently asked

Is CVE-2024-36909 being actively exploited?

CVE-2024-36909 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.24%.

How severe is CVE-2024-36909?

CVE-2024-36909 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 0.24% probability of exploitation.

Which products are affected by CVE-2024-36909?

Affected products include Linux Kernel.

How do I fix CVE-2024-36909?

Upgrade affected software to a fixed version, for example Linux Kernel 6.6.31 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-36909 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.