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CVE-2026-23346 is an arm64 Linux kernel vulnerability in the handling of ioremap_prot(). The issue arises because generic_access_phys(), the only non-generic caller noted for ioremap_prot(), passes a pgprot_t value derived from a user mapping of the target PFN. On arm64, pgprot_t carries all non-address PTE bits, including permission controls. As a result, ioremap_prot() could create a new mapping that preserves inappropriate user permission attributes instead of only the memory type. On systems with PAN enabled, the kernel can then fault when accessing that mapping, as shown by the crash path through __memcpy_fromio(), generic_access_phys(), and access_remote_vm(). The upstream fix changes arm64 ioremap_prot() to extract only the memory type from the user pgprot_t, asserts that the supplied mapping is a user mapping, and adds an arm64-specific ioremap() wrapper around __ioremap_prot() to avoid false positives for normal ioremap() users.
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