CVE-2026-63925 macsec: fix replay protection at XPN lower-PN wrap

In the Linux kernel, the following vulnerability has been resolved: macsec: fix replay protection at XPN lower-PN wrap In macsecpostdecrypt, when pn is U32MAX, pn + 1 overflows u32 to 0 and the first branch never fires. If nextpnhalves.lower is also in the upper half, pnsamehalfpn, lower is true...

PT-2026-61242

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the macsec post decrypt function where a replay protection failure occurs during an Extended Packet Number XPN lower-PN wrap. When the packet number pn reaches U32 MAX...