Red Hat Security Advisory: kernel security update

Moderate

A memory overflow vulnerability exists within the Linux kernel's networking subsystem. Specifically, an application can set the SO_RCVBUF socket option to its maximum value (INT_MAX), which triggers an integer overflow within the udp_rmem_release() function during socket closure. The udp_destruct_common() purges its receive queue and sums up skb->truesize in the queue. This total is calculated and stored in a local unsigned integer variable. The total size is then passed to udp_rmem_release() to adjust memory accounting. Due to the function taking a signed integer argument, the total size can wrap around, causing a memory overflow condition, potentially leading to system instability.

CWE-190 - Integer Overflow or Wraparound