{"id":"CVE-2026-74550","summary":"net: do not send ICMP/NDISC Redirects when peer allocation fails","details":"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.","modified":"2026-08-21T03:30:22.789013142Z","published":"2026-08-15T12:27:57.615Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74550.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/21666f7af49a90ef44d474916b8ef4402dfd74f5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5ec5f00fc606a6df8434948c4552b3cb1176595d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/828f6670d110ff2bf44c743037b38badc315704c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c0adf8b4247bcc5a145a25c1929006eb392580bb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dbc3791e3b2472e1ccc08947e0f83b443470ff4f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74550.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74550"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"92d8682926342d2b6aa5b2ecc02221e00e1573a0"},{"fixed":"c0adf8b4247bcc5a145a25c1929006eb392580bb"},{"fixed":"f5ecaa7ea7686fa7ecdb6affc9d3a9a42e4524b1"},{"fixed":"21666f7af49a90ef44d474916b8ef4402dfd74f5"},{"fixed":"5ec5f00fc606a6df8434948c4552b3cb1176595d"},{"fixed":"828f6670d110ff2bf44c743037b38badc315704c"},{"fixed":"dbc3791e3b2472e1ccc08947e0f83b443470ff4f"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74550.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.39"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.151"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.103"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74550.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}