CVE-2026-58811 · Infrastructure
NO FIX YET
A logic error in the smmu.c driver function smmu_get_mair_idx applies incorrect memory attributes to direct memory access mappings. A local process could use this to read information it should not see, with no extra privileges and no user interaction.
first public Nov 10, 2026 · 1 source
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The flaw is in the kernel-level SMMU (IOMMU) driver code, so systems with ARM SMMU hardware and that driver loaded are the ones to look at. The sources do not name affected kernel versions or whether a default configuration is exposed. Systems without that hardware or driver are likely not affected, but the sources do not confirm this.
Who cares arm, kernel, linux, smmu
Unknown from the sources.
No fix yet, per the sources.
In smmu_get_mair_idx of smmu.c, there is a possible way to apply incorrect memory attributes to direct memory access mappings due to a logic error. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
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