CVE-2024-47809: dlm: fix possible lkb_resource null dereference
First published: Sat Jan 11 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: dlm: fix possible lkb_resource null dereference This patch fixes a possible null pointer dereference when this function is called from request_lock() as lkb->lkb_resource is not assigned yet, only after validate_lock_args() by calling attach_lkb(). Another issue is that a resource name could be a non printable bytearray and we cannot assume to be ASCII coded. The log functionality is probably never being hit when DLM is used in normal way and no debug logging is enabled. The null pointer dereference can only occur on a new created lkb that does not have the resource assigned yet, it probably never hits the null pointer dereference but we should be sure that other changes might not change this behaviour and we actually can hit the mentioned null pointer dereference. In this patch we just drop the printout of the resource name, the lkb id is enough to make a possible connection to a resource name if this exists.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Kernel-devel | ||
| Linux Kernel | <6.6.66 | |
| Linux Kernel | >=6.7<6.12.5 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-47809?
CVE-2024-47809 has been classified with a severity that indicates it could potentially lead to a system crash due to a null pointer dereference.
How do I fix CVE-2024-47809?
To fix CVE-2024-47809, you need to update your Linux kernel to version 6.6.66 or later.
What systems are affected by CVE-2024-47809?
CVE-2024-47809 affects versions of the Linux kernel from 6.7 to 6.12.5, and below version 6.6.66.
What kind of vulnerability is CVE-2024-47809?
CVE-2024-47809 is a null pointer dereference vulnerability that can occur when accessing uninitialized resources in the Linux kernel.
Is CVE-2024-47809 already patched?
Yes, CVE-2024-47809 has been resolved with a patch in the Linux kernel to prevent the null pointer dereference.
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