CVE-2024-40945: iommu: Return right value in iommu_sva_bind_device()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-12 · updated 2026-10-15
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: iommu: Return right value in iommu_sva_bind_device() iommu_sva_bind_device() should return either a sva bond handle or an ERR_PTR value in error cases. Existing drivers (idxd and uacce) only check the return value with IS_ERR(). This could potentially lead to a kernel NULL pointer dereference issue if the function returns NULL instead of an error pointer. In reality, this doesn't cause any problems because iommu_sva_bind_device() only returns NULL when the kernel is not configured with CONFIG_IOMMU_SVA. In this case, iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) will return an error, and the device drivers won't call iommu_sva_bind_device() at all.

Affected products

Linux kernel: from 5.2 before 5.4.279; from 5.5 before 5.10.221; from 5.11 before 5.15.162; from 5.16 before 6.6.35; from 6.7 before 6.9.6; 6.10-rc1, 6.10-rc2 — fixed in 5.10.221, 5.15.162, 5.4.279, 6.6.35, 6.9.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.221, 5.15.162, 5.4.279, 6.6.35. Check the vendor advisory for mitigations.

References

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