Linux Kernel Vulnerability in Net/Sched Affecting Metadata Handling
CVE-2026-23378
What is CVE-2026-23378?
A vulnerability has been identified in the Linux kernel's net/sched component, specifically within the act_ife action's handling of metadata lists. The flaw centers around the incorrect implementation of metadata replacement; rather than replacing existing data on the metalist, new data is appended without bounds checking. This inappropriate behavior can lead to an endless accumulation of metadata, which may provoke out-of-bounds errors during encoding operations. Addressing this issue involves modifying the replacement behavior to incorporate the metalist into the kernel's RCU data structure, thereby restoring correct function and preventing potential crashes or exploits.
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Affected Version(s)
Linux aa9fd9a325d51fa0b11153b03b8fefff569fa955 < 56ade7ddea6ce605552341785d08e365c3f61861
Linux aa9fd9a325d51fa0b11153b03b8fefff569fa955 < 5b1449301ca070814d866990b46f48d3f39ea4ee
Linux aa9fd9a325d51fa0b11153b03b8fefff569fa955 < 91a89d3bdc2f63d983adc13d1771631663c5dc1b