CVE-2026-46266
In the Linux kernel, the following vulnerability has been resolved:
inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
Yizhou Zhao reported that simply having one RAW socket on protocol
IPPROTO_RAW (255) was dangerous.
socket(AFINET, SOCKRAW, 255);
A malicious incoming ICMP packet can set the protocol field to 255
and match this socket, leading to FNHE cache changes.
inner = IP(src="192.168.2.1", dst="8.8.8.8", proto=255)/Raw("TEST")
pkt = IP(src="192.168.1.1", dst="192.168.2.1")/ICMP(type=3, code=4, nexthopmtu=576)/inner
"man 7 raw" states:
A protocol of IPPROTORAW implies enabled IPHDRINCL and is able
to send any IP protocol that is specified in the passed header.
Receiving of all IP protocols via IPPROTO_RAW is not possible
using raw sockets.
Make sure we drop these malicious packets.
Package Versions Affected
Automatically patch vulnerabilities without upgrading
CVSS Version
Related Resources
References
https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99, https://git.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2, https://git.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575, https://git.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22, https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46266.json, https://nvd.nist.gov/vuln/detail/CVE-2026-46266, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git