{"schema":"threatline.record/2","record":{"id":"CVE-2026-98063","aliases":[],"summary":"bpf: Fix NULL-ptr-deref in btf_var_show()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix NULL-ptr-deref in btf_var_show()\n\nbtf_var_show() calls btf_type_id_resolve() unconditionally, which\ndereferences btf->resolved_ids. That is NULL for a base BTF - e.g. the\nvmlinux BTF that bpf_snprintf_btf() renders against - since base BTF is\nnot resolved during parsing. btf_modifier_show() guards this with\n'if (btf->resolved_ids)', but btf_var_show() does not.\n\nA BPF program that passes the type_id of a BTF_KIND_VAR from the vmlinux\nBTF to bpf_snprintf_btf() thus NULL-derefs:\n\nKASAN: probably user-memory-access in range [0x46638-0x4663f]\nRIP: 0010:btf_var_show (kernel/bpf/btf.c:2929)\nCall Trace:\n <TASK>\n btf_type_show (kernel/bpf/btf.c:8259)\n btf_type_snprintf_show (kernel/bpf/btf.c:8329)\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:84)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n </TASK>\n\nResolve the var's type directly with btf_type_skip_modifiers() when\nresolved_ids is NULL, mirroring btf_modifier_show().","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98063","source_modified_at":"2026-10-19T09:13:13.031Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"5756450c9a702da0efb4a993d0a6766b965736f3","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"e83fcbe3b5d4a1ffb0569bb7c280358065c6017a","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"e0d6a06171633d3ee3f7a39b57e5c845fb2b79f2","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"aec0a9c1579eb9edf534960be592d09481bd7ac3","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"e472ae0d97865e2021ee668a13eab64013aebf23","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"ca086264e98108b44fdf53971033811a48defe2b","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"ea383b3ea56979ce54c8aa88e6ec67164986c401","status":"affected","versionType":"git"},{"version":"c4d0bfb45068d853a478b9067a95969b1886a30f","lessThan":"5403a383f52fc0905703b488f7c3db4b2447dc58","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98063","source_modified_at":"2026-10-19T09:13:13.031Z","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-2026-98063","source_modified_at":"2026-10-19T09:13:13.031Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5756450c9a702da0efb4a993d0a6766b965736f3","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98063","source_modified_at":"2026-10-19T09:13:13.031Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5403a383f52fc0905703b488f7c3db4b2447dc58","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00176,"percentile":0.06833,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:24:07.203Z","modified_at":"2026-10-19T09:13:13.031Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98063","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:13:13.031Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98063","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/5756450c9a702da0efb4a993d0a6766b965736f3"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e83fcbe3b5d4a1ffb0569bb7c280358065c6017a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e0d6a06171633d3ee3f7a39b57e5c845fb2b79f2"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/aec0a9c1579eb9edf534960be592d09481bd7ac3"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e472ae0d97865e2021ee668a13eab64013aebf23"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ca086264e98108b44fdf53971033811a48defe2b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ea383b3ea56979ce54c8aa88e6ec67164986c401"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/5403a383f52fc0905703b488f7c3db4b2447dc58"}],"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":"2026-10-19T09:13:13.031Z","content_hash":"dda25729154acc3597db88501b1e3060c56cf9e247b6757f2d5f28fad2c27fd8"}}