CVE-2026-46266
Linux Kernel vulnerability
- Published3 Jun 2026
Description
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(AF_INET, SOCK_RAW, 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 IPPROTO_RAW implies enabled IP_HDRINCL 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.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HAffected products
Remediation
- 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
References
- https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99
- https://git.kernel.org/stable/c/47276297140ee6712646f9b19fb04fe26daedd01
- 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
Frequently asked
Is CVE-2026-46266 being actively exploited?
CVE-2026-46266 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.70%.
How severe is CVE-2026-46266?
CVE-2026-46266 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.70% probability of exploitation.
Which products are affected by CVE-2026-46266?
Affected products include Linux Kernel.
How do I fix CVE-2026-46266?
Upgrade affected software to a fixed version, for example Linux Kernel 6.6.128 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2026-46266 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.