{"id":"CVE-2025-21648","revision":"2a5d36a8f5ab4350a4ca7e42a92bc0f7","records":[{"revision":"2a5d36a8f5ab4350a4ca7e42a92bc0f7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21648","aliases":[],"title":"netfilter: conntrack: clamp maximum hashtable size to INT_MAX","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: clamp maximum hashtable size to INT_MAX\n\nUse INT_MAX as maximum size for the conntrack hashtable. Otherwise, it\nis possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof() when\nresizing hashtable because __GFP_NOWARN is unset. See:\n\n  0708a0afe291 (\"mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls\")\n\nNote: hashtable resize is only possible from init_netns.","state":0,"publishedAt":"2025-01-19T10:18:05.7+00:00","modifiedAt":"2026-10-15T01:02:48.32+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/netfilter/nf_conntrack_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"9cc1c73ad66610bffc80b691136ffc1e9a3b1a58\",\n                            \"lessThan\": \"a965f7f0ea3ae61b9165bed619d5d6da02c75f80\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9cc1c73ad66610bffc80b691136ffc1e9a3b1a58\",\n                            \"lessThan\": \"b1b2353d768f1b80cd7fe045a70adee576b9b338\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9cc1c73ad66610bffc80b691136ffc1e9a3b1a58\",\n                            \"lessThan\": \"5552b4fd44be3393b930434a7845d8d95a2a3c33\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9cc1c73ad66610bffc80b691136ffc1e9a3b1a58\",\n                            \"lessThan\": \"d5807dd1328bbc86e059c5de80d1bbee9d58ca3d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9cc1c73ad66610bffc80b691136ffc1e9a3b1a58\",\n                            \"lessThan\": \"f559357d035877b9d0dcd273e0ff83e18e1d46aa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9cc1c73ad66610bffc80b691136ffc1e9a3b1a58\",\n                            \"lessThan\": \"b541ba7d1f5a5b7b3e2e22dc9e40e18a7d6dbc13\",\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/netfilter/nf_conntrack_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.234\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.177\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.125\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.72\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.10\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.13\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/a965f7f0ea3ae61b9165bed619d5d6da02c75f80","https://git.kernel.org/stable/c/b1b2353d768f1b80cd7fe045a70adee576b9b338","https://git.kernel.org/stable/c/5552b4fd44be3393b930434a7845d8d95a2a3c33","https://git.kernel.org/stable/c/d5807dd1328bbc86e059c5de80d1bbee9d58ca3d","https://git.kernel.org/stable/c/f559357d035877b9d0dcd273e0ff83e18e1d46aa","https://git.kernel.org/stable/c/b541ba7d1f5a5b7b3e2e22dc9e40e18a7d6dbc13"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21648","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21648","identifiers":["CVE-2025-21648"]},"retained":false,"historicalAffected":[]}],"coverage":[]}