{"id":"CVE-2026-98064","revision":"dfc39d22fd3c47a9974a39a9bd889707","records":[{"revision":"dfc39d22fd3c47a9974a39a9bd889707","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98064","aliases":[],"title":"bpf: Fix NULL-ptr-deref when showing a void BTF type","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix NULL-ptr-deref when showing a void BTF type\n\nbtf_modifier_show() resolves the modifier and then calls\nbtf_type_ops(t)->show() unconditionally. For the void type (type_id 0,\nBTF_KIND_UNKN) kind_ops[] has no entry, so ->show is NULL.\n\nA \"const void\" (a modifier resolving to void) cannot be a map key or\nvalue - map_check_btf() rejects it because void has no size - so the map\ndump path does not reach it. But bpf_snprintf_btf() takes a type_id\nstraight from the BPF program, and passing such a \"const void\" from the\nvmlinux BTF NULL-derefs:\n\nKASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]\nRIP: 0010:btf_modifier_show (kernel/bpf/btf.c:2914)\nCall Trace:\n <TASK>\n btf_type_show (kernel/bpf/btf.c:8251)\n btf_type_snprintf_show (kernel/bpf/btf.c:8321)\n bpf_snprintf_btf (kernel/trace/bpf_trace.c:1047)\n bpf_prog_test_run_raw_tp (net/bpf/test_run.c:829)\n __sys_bpf (kernel/bpf/syscall.c:4804)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n </TASK>\n\nFall back to btf_df_show() when the resolved type has no show op; it\nemits the \"<unsupported kind:N>\" placeholder already used for kinds like\nFWD and FUNC. bpf_snprintf_btf() then returns the length as usual.","state":0,"publishedAt":"2026-09-25T10:24:07.811+00:00","modifiedAt":"2026-10-19T09:13:14+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/btf.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"cf528f2d7a0a54f2a3c6d439cfa3c8d7dfe90d8d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"adb15557a641cb8a31f83e5f62bd12042b138c7b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"62b00074b58ccf43f61f70f2cfcac80937b530c6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"86d86f9fcf62dd3654090fbf3cf7ae5f42aa0706\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"717abdfd1d559d01fdd102023f0a990fb0437240\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"98f1cb95221332139acf514350ae2cae3b8656c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"5324f4e75ff6e9c2ca2e267c5f34f0937f9d0ac9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"4ea508b9ebd78bce7f212166d2e2cba66b875f08\",\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/btf.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\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/cf528f2d7a0a54f2a3c6d439cfa3c8d7dfe90d8d","https://git.kernel.org/stable/c/adb15557a641cb8a31f83e5f62bd12042b138c7b","https://git.kernel.org/stable/c/62b00074b58ccf43f61f70f2cfcac80937b530c6","https://git.kernel.org/stable/c/86d86f9fcf62dd3654090fbf3cf7ae5f42aa0706","https://git.kernel.org/stable/c/717abdfd1d559d01fdd102023f0a990fb0437240","https://git.kernel.org/stable/c/98f1cb95221332139acf514350ae2cae3b8656c5","https://git.kernel.org/stable/c/5324f4e75ff6e9c2ca2e267c5f34f0937f9d0ac9","https://git.kernel.org/stable/c/4ea508b9ebd78bce7f212166d2e2cba66b875f08"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98064","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98064","identifiers":["CVE-2026-98064"]},"retained":false,"historicalAffected":[]}],"coverage":[]}