CVE-2026-63925

The CVE-2026-63925 issue affects the Linux kernel macsec XPN replay protection logic. When pn equals U32_MAX, pn+1 overflows to 0 and the code path for updating next_pn_halves may not fire, allowing an attacker to replay a frame carrying pn == 0xFFFFFFFF on an XPN association. The fix extends the...