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Linux Kernel act_pedit Partial COW Page-Cache LPE (CVE-2026-46331)

CVE-2026-46331 is a local privilege escalation in the Linux kernel's net/sched/actpedit subsystem. The vulnerable function tcfpeditact() computes the writable Copy-on-Write (COW) region using a pre-calculated maximum hint (tcfpoffmaxhint) before the actual…