CVE-2024-47809
Linux DLM Potential Null Pointer Dereference Vulnerability
Description
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.
INFO
Published Date :
Jan. 11, 2025, 1:15 p.m.
Last Modified :
Jan. 31, 2025, 3:26 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.8
References to Advisories, Solutions, and Tools
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CVE-2024-47809.
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CVE-2024-47809 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-47809 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Jan. 31, 2025
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NIST CWE-476 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 6.6.66 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.5 Changed Reference Type https://git.kernel.org/stable/c/2db11504ef82a60c1a2063ba7431a5cd013ecfcb No Types Assigned https://git.kernel.org/stable/c/2db11504ef82a60c1a2063ba7431a5cd013ecfcb Patch Changed Reference Type https://git.kernel.org/stable/c/6fbdc3980b70e9c1c86eccea7d5ee68108008fa7 No Types Assigned https://git.kernel.org/stable/c/6fbdc3980b70e9c1c86eccea7d5ee68108008fa7 Patch Changed Reference Type https://git.kernel.org/stable/c/b98333c67daf887c724cd692e88e2db9418c0861 No Types Assigned https://git.kernel.org/stable/c/b98333c67daf887c724cd692e88e2db9418c0861 Patch -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jan. 11, 2025
Action Type Old Value New Value Added Description 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. Added Reference https://git.kernel.org/stable/c/2db11504ef82a60c1a2063ba7431a5cd013ecfcb Added Reference https://git.kernel.org/stable/c/6fbdc3980b70e9c1c86eccea7d5ee68108008fa7 Added Reference https://git.kernel.org/stable/c/b98333c67daf887c724cd692e88e2db9418c0861
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-47809 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-47809
weaknesses.