Linux Kernel Vulnerability in Netfilter Related to Element Management
CVE-2026-23272
What is CVE-2026-23272?
A vulnerability in the Linux kernel's Netfilter component relates to the improper handling of set elements during insertion operations when the set reaches its capacity. This flaw allows for elements to be added and subsequently removed without adhering to the necessary RCU (Read-Copy-Update) grace period, potentially leading to inconsistencies. When the element count exceeds the set limit, the insertion should ideally trigger a flag to manage the overflow correctly. However, the current handling results in race conditions where readers could be accessing modified data. A proposed fix includes adjustments to ensure that element transactions are managed appropriately, minimizing disruption in batch processes. While synchronizing RCU during errors might simplify the process, it may impose performance penalties on large data operations.
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Affected Version(s)
Linux 35d0ac9070ef619e3bf44324375878a1c540387b < 6826131c7674329335ca25df2550163eb8a1fd0c
Linux 35d0ac9070ef619e3bf44324375878a1c540387b
Linux 35d0ac9070ef619e3bf44324375878a1c540387b