CVE-2024-56568: iommu/arm-smmu: Defer probe of clients after smmu device bound
First published: Fri Dec 27 2024(Updated: )
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. [will: Add comment]
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=4.9<5.10.231 | |
| Linux Kernel | >=5.11<5.15.174 | |
| Linux Kernel | >=5.16<6.1.120 | |
| Linux Kernel | >=6.2<6.6.66 | |
| Linux Kernel | >=6.7<6.12.4 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/c2527d07c7e9cda2c6165d5edccf74752baac1b0
- https://git.kernel.org/stable/c/dc02407ea952e20c544a078a6be2e6f008327973
- https://git.kernel.org/stable/c/f8f794f387ad21c4696e5cd0626cb6f8a5f6aea5
- https://git.kernel.org/stable/c/4a9485918a042e3114890dfbe19839a1897f8b2c
- https://git.kernel.org/stable/c/5018696b19bc6c021e934a8a59f4b1dd8c0ac9f8
- https://git.kernel.org/stable/c/229e6ee43d2a160a1592b83aad620d6027084aad
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56568
- https://nvd.nist.gov/vuln/detail/CVE-2024-56568
- https://launchpad.net/bugs/cve/CVE-2024-56568
- https://security-tracker.debian.org/tracker/CVE-2024-56568
- https://ubuntu.com/security/CVE-2024-56568
- https://git.kernel.org/linus/229e6ee43d2a160a1592b83aad620d6027084aad
Frequently Asked Questions
What is the severity of CVE-2024-56568?
CVE-2024-56568 has a high severity due to its potential for causing null pointer dereference leading to system instability.
Which Linux kernel versions are affected by CVE-2024-56568?
CVE-2024-56568 affects Linux kernel versions between 4.9 and 5.10.231, 5.11 and 5.15.174, 5.16 and 6.1.120, 6.2 and 6.6.66, as well as 6.7 and 6.12.4.
How do I fix CVE-2024-56568?
To fix CVE-2024-56568, update your Linux kernel to a version that is not affected, ensuring you choose a version above 6.12.4.
What causes CVE-2024-56568?
CVE-2024-56568 is caused by a race condition between the SMMU driver probe and client driver probe, leading to a null pointer dereference.
Is there a workaround for CVE-2024-56568?
Currently, there are no recommended workarounds for CVE-2024-56568 other than updating to a safe kernel version.
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