Threats Tagged 'cve-2026-45873'

A vulnerability in the Linux kernel's netfilter nft_set_rbtree component involves improper detection of partial overlaps in anonymous sets. The issue arises because the existing logic skips overlap checks on start elements when userspace provides an optimized representation for adjacent intervals. This can allow overlapping intervals with the same start element but different end elements to be added incorrectly. The vulnerability has been resolved by restoring the overlap check on start elements to properly detect and report overlaps.

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_rbtree: check for partial overlaps in anonymous sets Userspace provides an optimized representation in case intervals are adjacent, where the end element is omitted. The existing partial overlap detection logic skips anonymous set checks on start elements for this reason. However, it is possible to add intervals that overlap to this anonymous where two start elements with the same, eg. A-B, A-C where C < B. start end A B start end A C Restore the check on overlapping start elements to report an overlap.