{"id":"CVE-2026-98063","revision":"5c433eaf687a45cfa1cc9daa5410af7f","records":[{"revision":"5c433eaf687a45cfa1cc9daa5410af7f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98063","aliases":[],"title":"bpf: Fix NULL-ptr-deref in btf_var_show()","description":"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().","state":0,"publishedAt":"2026-09-25T10:24:07.203+00:00","modifiedAt":"2026-10-19T09:13:13.031+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\": \"5756450c9a702da0efb4a993d0a6766b965736f3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"e83fcbe3b5d4a1ffb0569bb7c280358065c6017a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"e0d6a06171633d3ee3f7a39b57e5c845fb2b79f2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"aec0a9c1579eb9edf534960be592d09481bd7ac3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"e472ae0d97865e2021ee668a13eab64013aebf23\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"ca086264e98108b44fdf53971033811a48defe2b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"ea383b3ea56979ce54c8aa88e6ec67164986c401\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c4d0bfb45068d853a478b9067a95969b1886a30f\",\n                            \"lessThan\": \"5403a383f52fc0905703b488f7c3db4b2447dc58\",\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/5756450c9a702da0efb4a993d0a6766b965736f3","https://git.kernel.org/stable/c/e83fcbe3b5d4a1ffb0569bb7c280358065c6017a","https://git.kernel.org/stable/c/e0d6a06171633d3ee3f7a39b57e5c845fb2b79f2","https://git.kernel.org/stable/c/aec0a9c1579eb9edf534960be592d09481bd7ac3","https://git.kernel.org/stable/c/e472ae0d97865e2021ee668a13eab64013aebf23","https://git.kernel.org/stable/c/ca086264e98108b44fdf53971033811a48defe2b","https://git.kernel.org/stable/c/ea383b3ea56979ce54c8aa88e6ec67164986c401","https://git.kernel.org/stable/c/5403a383f52fc0905703b488f7c3db4b2447dc58"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98063","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98063","identifiers":["CVE-2026-98063"]},"retained":false,"historicalAffected":[]}],"coverage":[]}