{"schema":"threatline.record/2","record":{"id":"CVE-2026-98064","aliases":[],"summary":"bpf: Fix NULL-ptr-deref when showing a void BTF type","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98064","source_modified_at":"2026-10-19T09:13:14.000Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"cf528f2d7a0a54f2a3c6d439cfa3c8d7dfe90d8d","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"adb15557a641cb8a31f83e5f62bd12042b138c7b","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"62b00074b58ccf43f61f70f2cfcac80937b530c6","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"86d86f9fcf62dd3654090fbf3cf7ae5f42aa0706","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"717abdfd1d559d01fdd102023f0a990fb0437240","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"98f1cb95221332139acf514350ae2cae3b8656c5","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"5324f4e75ff6e9c2ca2e267c5f34f0937f9d0ac9","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"4ea508b9ebd78bce7f212166d2e2cba66b875f08","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98064","source_modified_at":"2026-10-19T09:13:14.000Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.10","status":"affected"},{"version":"0","lessThan":"5.10","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98064","source_modified_at":"2026-10-19T09:13:14.000Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"62b00074b58ccf43f61f70f2cfcac80937b530c6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98064","source_modified_at":"2026-10-19T09:13:14.000Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"86d86f9fcf62dd3654090fbf3cf7ae5f42aa0706","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98064","source_modified_at":"2026-10-19T09:13:14.000Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"717abdfd1d559d01fdd102023f0a990fb0437240","basis":"first unaffected version stated in the CVE record"},{"source":"CVE 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List","url":"https://git.kernel.org/stable/c/86d86f9fcf62dd3654090fbf3cf7ae5f42aa0706"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/717abdfd1d559d01fdd102023f0a990fb0437240"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/98f1cb95221332139acf514350ae2cae3b8656c5"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/5324f4e75ff6e9c2ca2e267c5f34f0937f9d0ac9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/4ea508b9ebd78bce7f212166d2e2cba66b875f08"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:13:14.000Z","content_hash":"cabc5faad27ce250a965a3926e7895a0987bd71a2fe052655d59e670c367a00a"}}