Amazon Linux AMI 2: CVE-2023-52628: Security patch for kernel, kernel-livepatch-4.14.336-257.562, kernel-livepatch-4.14.336-257.566, kernel-livepatch-4.14.336-257.568, kernel-livepatch-4.14.343-259.562, kernel-livepatch-4.14.343-260.564 (Multiple Advisories)

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nftables: exthdr: fix 4-byte stack OOB write

If priv->len is a multiple of 4, then dst[len / 4] can write past
the destination array which leads to stack corruption.

This construct is necessary to clean the remainder of the register
in case ->len is NOT a multiple of the register size, so make it
conditional just like nft_payload.c does.

The bug was added in 4.1 cycle and then copied/inherited when
tcp/sctp and ip option support was added.

Bug reported by Zero Day Initiative project (ZDI-CAN-21950,
ZDI-CAN-21951, ZDI-CAN-21961).