Buffer Overflow in Linux Kernel UDP Reuse Port Handling
CVE-2026-52910
Key Information:
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What is CVE-2026-52910?
A vulnerability exists in the Linux kernel's handling of UDP reuse ports which may lead to buffer overflow issues. When a cBPF program is replaced while another thread is sending a UDP packet to the reuse port group, improper resource management can occur. Specifically, the reuseport program is freed without waiting for all RCU read operations to complete, which may lead to undefined behavior or crashes. This flaw highlights the importance of synchronizing access to shared resources within the kernel to maintain system stability.
Affected Version(s)
Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13 < 08264d5bba0bdd3a79bc2984fee09286aba0c4eb
Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13
Linux 538950a1b7527a0a52ccd9337e3fcd304f027f13
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.