Bug 2482114 (CVE-2026-45931)

Summary: CVE-2026-45931 kernel: accel/amdxdna: Hold mm structure across iommu_sva_unbind_device()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `accel/amdxdna` module. This vulnerability occurs when the `iommu_sva_unbind_device()` function attempts to access a memory management (`mm`) structure after it has been deallocated, leading to a use-after-free condition. This can result in a system crash, causing a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-27 15:11:59 UTC 
In the Linux kernel, the following vulnerability has been resolved:

accel/amdxdna: Hold mm structure across iommu_sva_unbind_device()

Some tests trigger a crash in iommu_sva_unbind_device() due to
accessing iommu_mm after the associated mm structure has been
freed.

Fix this by taking an explicit reference to the mm structure
after successfully binding the device, and releasing it only
after the device is unbound. This ensures the mm remains valid
for the entire SVA bind/unbind lifetime.
Comment 1 Keith Grant 2026-05-28 00:48:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052727-CVE-2026-45931-e8b8@gregkh/T