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clear trailing padding in build_polexpire()","CVE":"CVE-2026-31664","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31664","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: clear trailing padding in build_polexpire()\n\nbuild_expire() clears the trailing padding bytes of struct\nxfrm_user_expire after setting the hard field via memset_after(),\nbut the analogous function build_polexpire() does not do this for\nstruct xfrm_user_polexpire.\n\nThe padding bytes after the __u8 hard field are left\nuninitialized from the heap allocation, and are then sent to\nuserspace via netlink multicast to XFRMNLGRP_EXPIRE listeners,\nleaking kernel heap memory contents.\n\nAdd the missing memset_after() call, matching build_expire().","Type":"Description","Title":"xfrm: clear trailing padding in build_polexpire()"}]}}}