{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98065",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:19:56.073Z",
        "datePublished": "2026-09-25T10:24:08.406Z",
        "dateUpdated": "2026-10-19T09:13:14.981Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:13:14.981Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject key-less BTF for hash maps\n\nmap_check_btf() allows a key-less BTF (btf_key_type_id == 0) only for\nmaps that have a ->map_check_btf callback, and leaves the actual\ndecision to that callback. Hash maps used to have no ->map_check_btf,\nso a key-less BTF was rejected outright.\n\nThat changed when htab and rhtab gained a ->map_check_btf to register a\ndtor - htab in commit 1df97a7453ee (\"bpf: Register dtor for freeing\nspecial fields\") and rhtab in commit 6905f8601298 (\"bpf: Allow special\nfields in resizable hashtab\"). Neither looks at the key, so a key-less\nhash map now passes map_check_btf() and gets created. Reading it back\nthrough bpffs feeds the key type_id 0 into btf_type_seq_show();\nbtf_type_by_id() returns the void type, kind_ops[BTF_KIND_UNKN] is NULL,\nand btf_type_show() dereferences it:\n\nRIP: 0010:btf_type_show+0x223/0x2e0 kernel/bpf/btf.c:8232\nRSP: 0018:ffffc9000399f868 EFLAGS: 00010206\nRAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000\nRDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000028\nRBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000\nR10: ffffc9000399f970 R11: 0000000000000001 R12: ffffffff9b96b140\nR13: ffffc9000399f8e0 R14: ffff88803d393c00 R15: 0000000000000003\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000200000000000 CR3: 000000003d213000 CR4: 0000000000352ef0\nDR0: 0000000039ae8f55 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n btf_type_seq_show_flags+0xca/0x120 kernel/bpf/btf.c:8250\n htab_map_seq_show_elem+0x12e/0x350 kernel/bpf/hashtab.c:1669\n map_seq_show+0x13d/0x1e0 kernel/bpf/inode.c:293\n traverse.part.0.constprop.0+0x107/0x650 fs/seq_file.c:112\n traverse fs/seq_file.c:99 [inline]\n seq_read_iter+0x93f/0x1270 fs/seq_file.c:196\n seq_read+0x344/0x4d0 fs/seq_file.c:163\n vfs_read+0x1e4/0xb40 fs/read_write.c:572\n ksys_pread64 fs/read_write.c:764 [inline]\n __do_sys_pread64 fs/read_write.c:772 [inline]\n __se_sys_pread64 fs/read_write.c:769 [inline]\n __x64_sys_pread64+0x1eb/0x250 fs/read_write.c:769\n do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]\n do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nReject a key-less BTF in htab_map_check_btf() and rhtab_map_check_btf(),\nrestoring the previous behavior."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/hashtab.c"
                    ],
                    "versions": [
                        {
                            "version": "451a84a3ad3c897c03181af433e7c98640730f1f",
                            "lessThan": "54098e3fe34ec190bc256b338b9a93c7e2dc9354",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "51a17f0ce19c4ee2a25cf16c93490d509b1ebb0a",
                            "lessThan": "fa047f2a025003f5654ebd76539f16a6ead0401a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1df97a7453eec80c1912c2d0360290a3970a7671",
                            "lessThan": "7ca231252820c47aaec42a5db580db98f9b64724",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1df97a7453eec80c1912c2d0360290a3970a7671",
                            "lessThan": "0895a0c0734703be5532f3883c42db95615fd98b",
                            "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/hashtab.c"
                    ],
                    "versions": [
                        {
                            "version": "7.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "7.0",
                            "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": "7.0",
                                    "versionEndExcluding": "7.2.7"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "7.0",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/54098e3fe34ec190bc256b338b9a93c7e2dc9354"
                },
                {
                    "url": "https://git.kernel.org/stable/c/fa047f2a025003f5654ebd76539f16a6ead0401a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7ca231252820c47aaec42a5db580db98f9b64724"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0895a0c0734703be5532f3883c42db95615fd98b"
                }
            ],
            "title": "bpf: Reject key-less BTF for hash maps",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}