Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Local
0

CVE-2024-56568

Disclosure Date: December 27, 2024 •
CVE-2024-56568 CVSS v3 Base Score: 4.7
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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

iommu/arm-smmu: Defer probe of clients after smmu device bound

Null pointer dereference occurs due to a race between smmu
driver probe and client driver probe, when of_dma_configure()
for client is called after the iommu_device_register() for smmu driver
probe has executed but before the driver_bound() for smmu driver
has been called.

Following is how the race occurs:

T1:Smmu device probe T2: Client device probe

really_probe()
arm_smmu_device_probe()
iommu_device_register()

				really_probe()
				platform_dma_configure()
				of_dma_configure()
				of_dma_configure_id()
				of_iommu_configure()
				iommu_probe_device()
				iommu_init_device()
				arm_smmu_probe_device()
				arm_smmu_get_by_fwnode()
					driver_find_device_by_fwnode()
					driver_find_device()
					next_device()
					klist_next()
					    /* null ptr
					       assigned to smmu */
				/* null ptr dereference
				   while smmu->streamid_mask */

driver_bound()

klist_add_tail()

When this null smmu pointer is dereferenced later in
arm_smmu_probe_device, the device crashes.

Fix this by deferring the probe of the client device
until the smmu device has bound to the arm smmu driver.

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CVSS V3 Severity and Metrics
Base Score:
4.7 Medium
Impact Score:
3.6
Exploitability Score:
1
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector (AV):
Local
Attack Complexity (AC):
High
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux c2527d07c7e9cda2c6165d5edccf74752baac1b0
Linux not down converted
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

Products

Technical Analysis