CVE-2026-98647

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98647", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.362Z", "datePublished": "2026-10-18T15:20:18.360Z", "dateUpdated": "2026-10-19T09:23:16.870Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:23:16.870Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix divide-by-zero in btf_struct_walk()\n\nWhen an access goes past the struct and the last member is a flexible\narray, btf_struct_walk() folds the offset back into a single element with\n(off - moff) % t->size, but never checks that the element type has a size.\n\nBTF takes an empty struct, so this in program BTF\n\n\t/* event could be empty */\n\tstruct event {\n #ifdef HAVE_TIMESTAMP\n\t\t__u64 ts;\n #endif\n\t};\n\n\tstruct batch {\n\t\tint nr;\n\t\tstruct event events[];\n\t};\n\ndivides by zero at prog load time. Getting there needs a PTR_TO_BTF_ID that\nis not MEM_ALLOC, e.g. a plain read of a local kptr stashed in a map from a\nsleepable program.\n\nOops: divide error: 0000 [#1] SMP KASAN PTI\nRIP: 0010:btf_struct_walk+0x53f/0x1570\nCall Trace:\n <TASK>\n btf_struct_access+0x42a/0xcd0\n check_ptr_to_btf_access+0x4dc/0x1160\n check_mem_access+0x3a45/0x8740\n check_load_mem+0x36a/0xd10\n do_check_common+0x3ef0/0xb210\n bpf_check+0x6d3b/0x8580\n bpf_prog_load+0xf7c/0x2720\n __sys_bpf+0xa83/0x3690\n __x64_sys_bpf+0xc7/0x150\n x64_sys_call+0x1f3f/0x27e0\n do_syscall_64+0xe5/0x610\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n </TASK>\n\nReject a zero-sized element type. The fixed array path in the same function\nalready bails out on the same thing:\n\n\tbtf_struct_walk()\n\t...\n\t\t/* skip empty array */\n\t\tif (moff == mtrue_end)\n\t\t\tcontinue;\n\n\t\tmsize /= total_nelems;"}], "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": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "lessThan": "1ea3820937f8022e044c41c6e95c84b02741b45f", "status": "affected", "versionType": "git"}, {"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "lessThan": "172756f02663ad45c889c001c1a8cb4082a01a05", "status": "affected", "versionType": "git"}, {"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "lessThan": "934e9ba9f8d05656a48624710be67ca4dc8482e6", "status": "affected", "versionType": "git"}, {"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "lessThan": "63af086cb5fa6f72fd924f86bea4c2194da663a2", "status": "affected", "versionType": "git"}, {"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "lessThan": "8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1", "status": "affected", "versionType": "git"}, {"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "lessThan": "b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b", "status": "affected", "versionType": "git"}, {"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "lessThan": "b0b3dc66529676228cb938cbcad66920f735c223", "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": "5.8", "status": "affected"}, {"version": "0", "lessThan": "5.8", "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": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.9", "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": "5.8", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.12.112"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.2.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1ea3820937f8022e044c41c6e95c84b02741b45f"}, {"url": "https://git.kernel.org/stable/c/172756f02663ad45c889c001c1a8cb4082a01a05"}, {"url": "https://git.kernel.org/stable/c/934e9ba9f8d05656a48624710be67ca4dc8482e6"}, {"url": "https://git.kernel.org/stable/c/63af086cb5fa6f72fd924f86bea4c2194da663a2"}, {"url": "https://git.kernel.org/stable/c/8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1"}, {"url": "https://git.kernel.org/stable/c/b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b"}, {"url": "https://git.kernel.org/stable/c/b0b3dc66529676228cb938cbcad66920f735c223"}], "title": "bpf: Fix divide-by-zero in btf_struct_walk()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/btf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1ea3820937f8022e044c41c6e95c84b02741b45f", "status": "affected", "version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "versionType": "git"}, {"lessThan": "172756f02663ad45c889c001c1a8cb4082a01a05", "status": "affected", "version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "versionType": "git"}, {"lessThan": "934e9ba9f8d05656a48624710be67ca4dc8482e6", "status": "affected", "version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "versionType": "git"}, {"lessThan": "63af086cb5fa6f72fd924f86bea4c2194da663a2", "status": "affected", "version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "versionType": "git"}, {"lessThan": "8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1", "status": "affected", "version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "versionType": "git"}, {"lessThan": "b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b", "status": "affected", "version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "versionType": "git"}, {"lessThan": "b0b3dc66529676228cb938cbcad66920f735c223", "status": "affected", "version": "9c5f8a1008a121e4c6b24af211034e24b0b63081", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/btf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.8"}, {"lessThan": "5.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.112", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.55", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix divide-by-zero in btf_struct_walk()\n\nWhen an access goes past the struct and the last member is a flexible\narray, btf_struct_walk() folds the offset back into a single element with\n(off - moff) % t->size, but never checks that the element type has a size.\n\nBTF takes an empty struct, so this in program BTF\n\n\t/* event could be empty */\n\tstruct event {\n #ifdef HAVE_TIMESTAMP\n\t\t__u64 ts;\n #endif\n\t};\n\n\tstruct batch {\n\t\tint nr;\n\t\tstruct event events[];\n\t};\n\ndivides by zero at prog load time. Getting there needs a PTR_TO_BTF_ID that\nis not MEM_ALLOC, e.g. a plain read of a local kptr stashed in a map from a\nsleepable program.\n\nOops: divide error: 0000 [#1] SMP KASAN PTI\nRIP: 0010:btf_struct_walk+0x53f/0x1570\nCall Trace:\n <TASK>\n btf_struct_access+0x42a/0xcd0\n check_ptr_to_btf_access+0x4dc/0x1160\n check_mem_access+0x3a45/0x8740\n check_load_mem+0x36a/0xd10\n do_check_common+0x3ef0/0xb210\n bpf_check+0x6d3b/0x8580\n bpf_prog_load+0xf7c/0x2720\n __sys_bpf+0xa83/0x3690\n __x64_sys_bpf+0xc7/0x150\n x64_sys_call+0x1f3f/0x27e0\n do_syscall_64+0xe5/0x610\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n </TASK>\n\nReject a zero-sized element type. The fixed array path in the same function\nalready bails out on the same thing:\n\n\tbtf_struct_walk()\n\t...\n\t\t/* skip empty array */\n\t\tif (moff == mtrue_end)\n\t\t\tcontinue;\n\n\t\tmsize /= total_nelems;"}], "id": "CVE-2026-98647", "lastModified": "2026-10-19T10:19:29.113", "metrics": {}, "published": "2026-10-18T16:17:17.980", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/172756f02663ad45c889c001c1a8cb4082a01a05"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1ea3820937f8022e044c41c6e95c84b02741b45f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63af086cb5fa6f72fd924f86bea4c2194da663a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/934e9ba9f8d05656a48624710be67ca4dc8482e6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b0b3dc66529676228cb938cbcad66920f735c223"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: bpf: Fix divide-by-zero in btf_struct_walk()", "id": "2554962", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2554962"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-369", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Fix divide-by-zero in btf_struct_walk()\nWhen an access goes past the struct and the last member is a flexible\narray, btf_struct_walk() folds the offset back into a single element with\n(off - moff) % t->size, but never checks that the element type has a size.\nBTF takes an empty struct, so this in program BTF\n/* event could be empty */\nstruct event {\n#ifdef HAVE_TIMESTAMP\n__u64 ts;\n#endif\n};\nstruct batch {\nint nr;\nstruct event events[];\n};\ndivides by zero at prog load time. Getting there needs a PTR_TO_BTF_ID that\nis not MEM_ALLOC, e.g. a plain read of a local kptr stashed in a map from a\nsleepable program.\nOops: divide error: 0000 [#1] SMP KASAN PTI\nRIP: 0010:btf_struct_walk+0x53f/0x1570\nCall Trace:\n<TASK>\nbtf_struct_access+0x42a/0xcd0\ncheck_ptr_to_btf_access+0x4dc/0x1160\ncheck_mem_access+0x3a45/0x8740\ncheck_load_mem+0x36a/0xd10\ndo_check_common+0x3ef0/0xb210\nbpf_check+0x6d3b/0x8580\nbpf_prog_load+0xf7c/0x2720\n__sys_bpf+0xa83/0x3690\n__x64_sys_bpf+0xc7/0x150\nx64_sys_call+0x1f3f/0x27e0\ndo_syscall_64+0xe5/0x610\nentry_SYSCALL_64_after_hwframe+0x76/0x7e\n</TASK>\nReject a zero-sized element type. The fixed array path in the same function\nalready bails out on the same thing:\nbtf_struct_walk()\n...\n/* skip empty array */\nif (moff == mtrue_end)\ncontinue;\nmsize /= total_nelems;", "A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. This vulnerability allows a local user to cause a Denial of Service (DoS) by crashing the kernel. When loading a specially crafted BPF program that accesses a structure with an empty flexible array member, the verifier attempts to compute offsets without checking for a zero element size, triggering a divide-by-zero error."], "name": "CVE-2026-98647", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98647\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98647\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98647.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9c5f8a1008a121e4c6b24af211034e24b0b63081,1ea3820937f8022e044c41c6e95c84b02741b45f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9c5f8a1008a121e4c6b24af211034e24b0b63081,172756f02663ad45c889c001c1a8cb4082a01a05)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9c5f8a1008a121e4c6b24af211034e24b0b63081,934e9ba9f8d05656a48624710be67ca4dc8482e6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9c5f8a1008a121e4c6b24af211034e24b0b63081,63af086cb5fa6f72fd924f86bea4c2194da663a2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9c5f8a1008a121e4c6b24af211034e24b0b63081,8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9c5f8a1008a121e4c6b24af211034e24b0b63081,b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[9c5f8a1008a121e4c6b24af211034e24b0b63081,b0b3dc66529676228cb938cbcad66920f735c223)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.222,5.16.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.189,6.2.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.158,6.7.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.112,6.13.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.55,6.19.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.9,7.3.0]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-18T19:15:14.233098+00:00", "updated": "2026-10-23T07:30:09.338395+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}