{"id":"CVE-2026-64576","revision":"bf692dc0868c4e72b60d44fa2a9be4c5","records":[{"revision":"bf692dc0868c4e72b60d44fa2a9be4c5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64576","aliases":[],"title":"nexthop: initialize extack in nh_res_bucket_migrate()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: initialize extack in nh_res_bucket_migrate()\n\nnh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to\ncall_nexthop_res_bucket_notifiers(). When\nnh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns\n-ENOMEM), the error is propagated back before any notifier sets\nextack._msg, and the error path formats the stale pointer with\npr_err_ratelimited(\"%s\\n\", extack._msg). With CONFIG_INIT_STACK_NONE\nthis dereferences uninitialized stack memory:\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: maybe wild-memory-access in range [...]\n  RIP: 0010:string (lib/vsprintf.c:730)\n   vsnprintf (lib/vsprintf.c:2945)\n   _printk (kernel/printk/printk.c:2504)\n   nh_res_bucket_migrate (net/ipv4/nexthop.c:1816)\n   nh_res_table_upkeep (net/ipv4/nexthop.c:1866)\n   rtm_new_nexthop (net/ipv4/nexthop.c:3323)\n   rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n   netlink_sendmsg (net/netlink/af_netlink.c:1900)\n  Kernel panic - not syncing: Fatal exception\n\nZero-initialize extack so _msg is NULL on error paths that never set it.","state":0,"publishedAt":"2026-08-05T08:09:32.529+00:00","modifiedAt":"2026-10-19T20:48:42.772+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/nexthop.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7c37c7e00411b3d1e0c5292368317aca69d1f324\",\n                            \"lessThan\": \"eacd2e2117e8682f937967fda1022e7f1c22d91a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c37c7e00411b3d1e0c5292368317aca69d1f324\",\n                            \"lessThan\": \"37bbd7e1d8df0bec3d187e961783e20c30533d2c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c37c7e00411b3d1e0c5292368317aca69d1f324\",\n                            \"lessThan\": \"c0936c131a71657afc635d0db2ab096d15d473e1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c37c7e00411b3d1e0c5292368317aca69d1f324\",\n                            \"lessThan\": \"3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c37c7e00411b3d1e0c5292368317aca69d1f324\",\n                            \"lessThan\": \"d536bf205c71f700f6de2086038c3e1d77724715\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c37c7e00411b3d1e0c5292368317aca69d1f324\",\n                            \"lessThan\": \"18506d7263768d76ac8e057ba55a4d9da50aad66\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7c37c7e00411b3d1e0c5292368317aca69d1f324\",\n                            \"lessThan\": \"6347c5314cee49f364aaf2e40ff15415a57a116e\",\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/nexthop.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.216\",\n                            \"lessThanOrEqual\": \"5.15.*\",\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\": \"6.6.148\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.101\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.42\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.6\",\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:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/eacd2e2117e8682f937967fda1022e7f1c22d91a","https://git.kernel.org/stable/c/37bbd7e1d8df0bec3d187e961783e20c30533d2c","https://git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1","https://git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d","https://git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715","https://git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66","https://git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64576","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64576","identifiers":["CVE-2026-64576"]},"retained":false,"historicalAffected":[]}],"coverage":[]}