PT-2025-3147 · Linux+7 · Linux Kernel+7
Dexuan Cui
·
Published
2024-11-06
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Updated
2025-10-03
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CVE-2024-55916
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions prior to 6.6.74
Description
A vulnerability in the Linux kernel has been resolved, which could cause a kernel NULL pointer dereference when the KVP (or VSS) daemon starts before the VMBus channel's ringbuffer is fully initialized. This can happen because the KVP/VSS channel callback can be invoked even before the channel is fully opened. The issue is caused by the
kvp register done() function, which can cause the channel callback to be called before the channel is fully opened, resulting in a NULL pointer dereference. To fix the panic, the steps in util probe() have been reordered to prevent the race condition from happening.Recommendations
For Linux kernel versions prior to 6.6.74, update to version 6.6.74 or later to fix the vulnerability.
As a temporary workaround, consider disabling the
kvp register done() function until a patch is available.
Restrict access to the /dev/vmbus/hv kvp device file to minimize the risk of exploitation.
Avoid using the KVP OP REGISTER1 message in the affected API endpoint until the issue is resolved.Exploit
Fix
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Astra Linux
Debian
Linuxmint
Linux Kernel
Red Os
Suse
Ubuntu