Out-of-bounds Write Affecting kernel-debuginfo package, versions <0:4.14.343-261.564.amzn2

Note: Versions mentioned in the description apply only to the upstream kernel-debuginfo package and not the kernel-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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).

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-52628
• https://git.kernel.org/stable/c/1ad7b189cc1411048434e8595ffcbe7873b71082
• https://git.kernel.org/stable/c/a7d86a77c33ba1c357a7504341172cc1507f0698
• https://git.kernel.org/stable/c/c8f292322ff16b9a2272a67de396c09a50e09dce
• https://git.kernel.org/stable/c/d9ebfc0f21377690837ebbd119e679243e0099cc
• https://git.kernel.org/stable/c/fd94d9dadee58e09b49075240fe83423eb1dcd36
• https://git.kernel.org/stable/c/28a97c43c9e32f437ebb8d6126f9bb7f3ca9521a
• https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
• https://git.kernel.org/stable/c/cf39c4f77a773a547ac2bcf30ecdd303bb0c80cb