RCU Violation in Linux Kernel Network Protocol Handling
CVE-2026-23255
What is CVE-2026-23255?
A vulnerability exists in the Linux kernel where the functions ptype_seq_next() and ptype_seq_show() fail to adhere to proper Read-Copy-Update (RCU) synchronization rules. Specifically, ptype_seq_show() attempts to access a device name without the necessary barriers, risking exposure to data races. Concurrent modifications by writers may alter or free packet_type structures without ensuring that the required RCU grace period has elapsed, leading to potential unstable behavior. A patch has been implemented to introduce secure RCU protections and prevent these issues by maintaining a reliable device pointer through the processing sequence.
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Affected Version(s)
Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 589a530ae44d0c80f523fcfd1a15af8087f27d35
Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Linux 2.6.12