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CVE-2026-6386 is a FreeBSD amd64 kernel vulnerability in pmap_pkru_update_range(), the routine used when applying memory protection keys to an address range. The flaw is caused by missing handling for 1GB large-page mappings created via shm_create_largepage(3). When processing page table structures, the vulnerable code always treated a page directory page entry as though it pointed to a lower-level page table page, instead of recognizing that it could represent a 1GB large-page mapping. As a result, an unprivileged user can cause the kernel to misinterpret userspace memory as a page table page and perform unintended writes through that path.
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A FreeBSD amd64 kernel memory corruption vulnerability caused by missing large-page handling in pmap_pkru_update_range(), allowing an unprivileged user to overwrite memory outside intended permissions.
A FreeBSD amd64 kernel vulnerability in pmap_pkru_update_range() where missing handling for 1GB largepage mappings can let an unprivileged user cause userspace memory to be treated as a page table page, enabling unauthorized memory overwrite.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.