{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98063",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:19:56.073Z",
        "datePublished": "2026-09-25T10:24:07.203Z",
        "dateUpdated": "2026-10-19T09:13:13.031Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:13:13.031Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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()."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/btf.c"
                    ],
                    "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"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/btf.c"
                    ],
                    "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"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.10",
                                    "versionEndExcluding": "5.10.271"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.10",
                                    "versionEndExcluding": "5.15.222"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.10",
                                    "versionEndExcluding": "6.1.189"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.10",
                                    "versionEndExcluding": "6.6.158"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.10",
                                    "versionEndExcluding": "6.12.111"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.10",
                                    "versionEndExcluding": "6.18.53"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.10",
                                    "versionEndExcluding": "7.2.7"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.10",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/5756450c9a702da0efb4a993d0a6766b965736f3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e83fcbe3b5d4a1ffb0569bb7c280358065c6017a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e0d6a06171633d3ee3f7a39b57e5c845fb2b79f2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/aec0a9c1579eb9edf534960be592d09481bd7ac3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e472ae0d97865e2021ee668a13eab64013aebf23"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ca086264e98108b44fdf53971033811a48defe2b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ea383b3ea56979ce54c8aa88e6ec67164986c401"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5403a383f52fc0905703b488f7c3db4b2447dc58"
                }
            ],
            "title": "bpf: Fix NULL-ptr-deref in btf_var_show()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}