{"id":"CVE-2026-90393","revision":"e9ec0e1e2d024913a64d744d292eb92d","records":[{"revision":"e9ec0e1e2d024913a64d744d292eb92d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90393","aliases":[],"title":"bpf: Fix potential UAF in bpf_netns_link_update_prog","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix potential UAF in bpf_netns_link_update_prog\n\nIn bpf_netns_link_update_prog, the checks for old_prog and prog type\nare currently performed locklessly before acquiring netns_bpf_mutex.\nThis creates a race condition that can lead to a UAF issue.\n\nIf two threads concurrently execute BPF_LINK_UPDATE on the same netns\nlink, the following execution path can trigger a UAF:\n\nCPU0                                          CPU1\nbpf_netns_link_update_prog\n  if (old_prog && old_prog != link->prog)\n    return -EPERM;\n                                              bpf_netns_link_update_prog\n                                                if (old_prog && old_prog != link->prog)\n                                                ...\n                                                old_prog = xchg(&link->prog, new_prog);\n                                                bpf_prog_put(old_prog);\n  if (new_prog->type != link->prog->type) <-- trigger UAF\n\nFix this by moving the old_prog and prog->type checks inside the\nnetns_bpf_mutex critical section. Meanwhile, use guard() to simplify\nlock management and avoid all the goto jumping.","state":0,"publishedAt":"2026-09-17T16:09:26.388+00:00","modifiedAt":"2026-10-19T09:02:57.658+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                        \"kernel/bpf/net_namespace.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7f045a49fee04b5662cbdeaf0838f9322ae8c63a\",\n                            \"lessThan\": \"d462b5481d77ce7df8a5ff89a699386f00c9214d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f045a49fee04b5662cbdeaf0838f9322ae8c63a\",\n                            \"lessThan\": \"bdddf3e1493ee973619c154a57071ce67f78598b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f045a49fee04b5662cbdeaf0838f9322ae8c63a\",\n                            \"lessThan\": \"79a66fd997d4eecf17302d613194879eb32e0986\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f045a49fee04b5662cbdeaf0838f9322ae8c63a\",\n                            \"lessThan\": \"f4ce6803df4095777191d800bebc50219b615ca0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f045a49fee04b5662cbdeaf0838f9322ae8c63a\",\n                            \"lessThan\": \"277168cb9d153ce8e9c3f9275670e32ae61b41d6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f045a49fee04b5662cbdeaf0838f9322ae8c63a\",\n                            \"lessThan\": \"bda86e9f31b9a296b6e64a51c91dc776fc9f613e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f045a49fee04b5662cbdeaf0838f9322ae8c63a\",\n                            \"lessThan\": \"923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7f045a49fee04b5662cbdeaf0838f9322ae8c63a\",\n                            \"lessThan\": \"5c5997836381010fc5907b36bc17d3b19407e933\",\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                        \"kernel/bpf/net_namespace.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/d462b5481d77ce7df8a5ff89a699386f00c9214d","https://git.kernel.org/stable/c/bdddf3e1493ee973619c154a57071ce67f78598b","https://git.kernel.org/stable/c/79a66fd997d4eecf17302d613194879eb32e0986","https://git.kernel.org/stable/c/f4ce6803df4095777191d800bebc50219b615ca0","https://git.kernel.org/stable/c/277168cb9d153ce8e9c3f9275670e32ae61b41d6","https://git.kernel.org/stable/c/bda86e9f31b9a296b6e64a51c91dc776fc9f613e","https://git.kernel.org/stable/c/923f559e95b89b33c7e1793b3d8f7f4ec9b2e4b7","https://git.kernel.org/stable/c/5c5997836381010fc5907b36bc17d3b19407e933"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90393","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90393","identifiers":["CVE-2026-90393"]},"retained":false,"historicalAffected":[]}],"coverage":[]}