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CVE-2022-49426: iommu/arm-smmu-v3-sva: Fix mm use-after-free

• Severity: high (CVSS 7.8 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: 2025-02-26 · updated 2026-06-17
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu-v3-sva: Fix mm use-after-free We currently call arm64_mm_context_put() without holding a reference to the mm, which can result in use-after-free. Call mmgrab()/mmdrop() to ensure the mm only gets freed after we unpinned the ASID.

Affected products

• Linux kernel: from 5.11 before 5.15.46; from 5.16 before 5.17.14; from 5.18 before 5.18.3 — fixed in 5.15.46, 5.17.14, 5.18.3

How to fix

Upgrade to a fixed version: Linux kernel 5.15.46, 5.17.14, 5.18.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/9aa215450888cf29af0c479e14a712dc6b0c506c
• https://git.kernel.org/stable/c/cbd23144f7662b00bcde32a938c4a4057e476d68
• https://git.kernel.org/stable/c/e3cbbdbff8a4db5d053c53fd71be62ccccdb52b0
• https://git.kernel.org/stable/c/fc90f13ea0dcd960e5002d204fa55cec4e0db2fa

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