{"id":"CVE-2026-74550","revision":"9893eb5c442a4c53801b3959a8dd4114","records":[{"revision":"9893eb5c442a4c53801b3959a8dd4114","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74550","aliases":[],"title":"net: do not send ICMP/NDISC Redirects when peer allocation fails","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not send ICMP/NDISC Redirects when peer allocation fails\n\nWhen inet_getpeer_v4() or inet_getpeer_v6() fails to allocate a peer entry\nunder memory pressure or tree size caps, redirect handlers previously fell\nback to sending un-rate-limited ICMP/NDISC Redirect messages.\n\nIn IPv4, ip_rt_send_redirect() called icmp_send() directly when peer == NULL.\nIn IPv6, ip6_forward() and ndisc_send_redirect() passed a NULL peer into\ninet_peer_xrlim_allow(), which returned true when peer == NULL.\n\nBecause ICMP/NDISC Redirects are not part of the default global rate limit\nmask (sysctl_icmp_ratemask), sending redirects when peer == NULL creates\nan un-rate-limited ICMP packet storm.\n\nFix this by failing closed in ip_rt_send_redirect(), ip6_forward(), and\nndisc_send_redirect() when peer is NULL.","state":0,"publishedAt":"2026-08-15T12:27:57.615+00:00","modifiedAt":"2026-10-16T19:05:55.243+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv4/route.c\",\n                        \"net/ipv6/ip6_output.c\",\n                        \"net/ipv6/ndisc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"92d8682926342d2b6aa5b2ecc02221e00e1573a0\",\n                            \"lessThan\": \"c0adf8b4247bcc5a145a25c1929006eb392580bb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92d8682926342d2b6aa5b2ecc02221e00e1573a0\",\n                            \"lessThan\": \"f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92d8682926342d2b6aa5b2ecc02221e00e1573a0\",\n                            \"lessThan\": \"21666f7af49a90ef44d474916b8ef4402dfd74f5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92d8682926342d2b6aa5b2ecc02221e00e1573a0\",\n                            \"lessThan\": \"5ec5f00fc606a6df8434948c4552b3cb1176595d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92d8682926342d2b6aa5b2ecc02221e00e1573a0\",\n                            \"lessThan\": \"828f6670d110ff2bf44c743037b38badc315704c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"92d8682926342d2b6aa5b2ecc02221e00e1573a0\",\n                            \"lessThan\": \"dbc3791e3b2472e1ccc08947e0f83b443470ff4f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/ipv4/route.c\",\n                        \"net/ipv6/ip6_output.c\",\n                        \"net/ipv6/ndisc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.39\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.39\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.183\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.151\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.103\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.44\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.8\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/c0adf8b4247bcc5a145a25c1929006eb392580bb","https://git.kernel.org/stable/c/f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1","https://git.kernel.org/stable/c/21666f7af49a90ef44d474916b8ef4402dfd74f5","https://git.kernel.org/stable/c/5ec5f00fc606a6df8434948c4552b3cb1176595d","https://git.kernel.org/stable/c/828f6670d110ff2bf44c743037b38badc315704c","https://git.kernel.org/stable/c/dbc3791e3b2472e1ccc08947e0f83b443470ff4f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74550","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74550","identifiers":["CVE-2026-74550"]},"retained":false,"historicalAffected":[]}],"coverage":[]}