Local kernel compromise via amdxdna use-after-free
Published May 27, 2026 · Updated May 27, 2026
Use-after-free in the amdxdna driver in Linux Kernel 6.14 through 6.18.13 and 6.19 through 6.19.3 allows local users to compromise the kernel. During device unbind, amdxdna passes an iommu_mm associated with an already-freed mm_struct to iommu_sva_unbind_device() because the bind path does not retain an mm reference for the full SVA lifetime. A low-privileged process with access to /dev/accel/accelN on an AMD NPU system can trigger the flaw through its own open-and-close sequence, causing a kernel panic or enabling freed-kernel-memory disclosure and kernel/IOMMU state corruption.
Summary
What happened
Use-after-free in the amdxdna driver in Linux Kernel 6.14 through 6.18.13 and 6.19 through 6.19.3 allows local users to compromise the kernel. During device unbind, amdxdna passes an iommu_mm associated with an already-freed mm_struct to iommu_sva_unbind_device() because the bind path does not retain an mm reference for the full SVA lifetime. A low-privileged process with access to /dev/accel/accelN on an AMD NPU system can trigger the flaw through its own open-and-close sequence, causing a kernel panic or enabling freed-kernel-memory disclosure and kernel/IOMMU state corruption.
The record
- CVE
- CVE-2026-45931
- Published
- May 27, 2026
- Updated
- May 27, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 27, 2026CVE publishedPublication date reported by the CVE source.
- May 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=6.14
- Affected versionversion=be462c97b7dfd24999babe39cce3de224ebe1f80 <a9162439ad792afcddc04718408ec1380b7a5f63
- Affected versionversion=be462c97b7dfd24999babe39cce3de224ebe1f80 <f31ccf6278132a35a652fe5eeac3941e1e912398
- Affected versionversion=be462c97b7dfd24999babe39cce3de224ebe1f80 <f6b4c1d98a7b8040d4d02e89425b3942016a2c2c
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
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Your stack
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