this post was submitted on 02 Nov 2026
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Linux
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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you do know you can just put a firewall rule in to prevent any IP options from hitting the server
The rule (matches header length > 20 bytes, i.e. IHL 6–15):
-A ufw-before-input -m u32 --u32 "0>>24&0x0F=6:15" -j DROPto/etc/ufw/before.rules, above theRELATED,ESTABLISHEDaccept line. Then runufw reload./usr/local/csf/bin/csfpre.shso it survives csf restarts.-t raw -I PREROUTINGinstead, so container traffic is covered too.Test: run
ping -Rat the box and watch the counter go up iniptables -L INPUT -v -n. Note that many networks drop option packets in transit, so test from the same LAN or a local netns.its a stopgap. not a fix. but you don't have to take all your servers offline ..... just put the block in and wait for the patch
ok gpt
Do you also have a nftables rule?