{"id":"CVE-2026-46266","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ninet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP\n\nYizhou Zhao reported that simply having one RAW socket on protocol\nIPPROTO_RAW (255) was dangerous.\n\n  sock…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ninet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP\n\nYizhou Zhao reported that simply having one RAW socket on protocol\nIPPROTO_RAW (255) was dangerous.\n\n  sock…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.12.1, < 6.6.128","linux_kernel >= 6.7, < 6.12.75","linux_kernel >= 6.13, < 6.18.14","linux_kernel >= 6.19, < 6.19.4","linux_kernel = 2.6.12"],"patched":["linux_kernel 6.19.4"],"published":"2026-06-03","updated":"2026-09-02","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-46266","references":[{"url":"https://git.kernel.org/stable/c/19e42490c89bac9a388f28179e66bebbef350f99","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/47276297140ee6712646f9b19fb04fe26daedd01","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/531c1aec81bfe19d00af13da5531fbb8209e4bd2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/719d3932b8f6e3348ce2f0ac58e278301fc17575","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c89477ad79446867394360b29bb801010fc3ff22","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46266.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-46266"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2484456"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46266"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46266"},{"url":"https://lore.kernel.org/linux-cve-announce/2026060337-CVE-2026-46266-1e5e@gregkh/T"},{"url":"https://access.redhat.com/errata/RHSA-2026:64775"},{"url":"https://access.redhat.com/errata/RHSA-2026:66180"},{"url":"https://access.redhat.com/errata/RHSA-2026:68531"},{"url":"https://access.redhat.com/errata/RHSA-2026:68532"}],"tags":["nvd","csaf","vex","red-hat","score-dispute"],"epss":0.00371,"epssPercentile":0.30894,"ingestedAt":"2026-09-02T13:44:42.450Z","cwe":["CWE-1287"],"scores":{"nvd":9.1,"vendor":7},"slug":"CVE-2026-46266","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ninet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP\n\nYizhou Zhao reported that simply having one RAW socket on protocol\nIPPROTO_RAW (255) was dangerous.\n\n  socket(AF_INET, SOCK_RAW, 255);\n\nA malicious incoming ICMP packet can set the protocol field to 255\nand match this socket, leading to FNHE cache changes.\n\ninner = IP(src=\"192.168.2.1\", dst=\"8.8.8.8\", proto=255)/Raw(\"TEST\")\npkt = IP(src=\"192.168.1.1\", dst=\"192.168.2.1\")/ICMP(type=3, code=4, nexthopmtu=576)/inner\n\n\"man 7 raw\" states:\n\n  A protocol of IPPROTO_RAW implies enabled IP_HDRINCL and is able\n  to send any IP protocol that is specified in the passed header.\n  Receiving of all IP protocols via IPPROTO_RAW is not possible\n  using raw sockets.\n\nMake sure we drop these malicious packets.\n\n## Affected\n\n- `linux_kernel >= 2.6.12.1, < 6.6.128`\n- `linux_kernel >= 6.7, < 6.12.75`\n- `linux_kernel >= 6.13, < 6.18.14`\n- `linux_kernel >= 6.19, < 6.19.4`\n- `linux_kernel = 2.6.12`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.19.4`\n\n## Vendor advisories\n\n- **RHSA-2026:64775** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10), Red Hat Enterprise Linux Real Time for NFV (v. 10), Red Hat Enterprise Linux Real Time (v. 10) · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:64775)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46266.json)\n- **RHSA-2026:66180** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66180)\n- **RHSA-2026:68531** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68531)\n- **RHSA-2026:68532** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68532)","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}