227 lines
11 KiB
JSON
227 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-98647",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.362Z",
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"datePublished": "2026-10-18T15:20:18.360Z",
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"dateUpdated": "2026-10-19T09:23:16.870Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:23:16.870Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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;"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/bpf/btf.c"
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],
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"versions": [
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{
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"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081",
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"lessThan": "1ea3820937f8022e044c41c6e95c84b02741b45f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081",
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"lessThan": "172756f02663ad45c889c001c1a8cb4082a01a05",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081",
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"lessThan": "934e9ba9f8d05656a48624710be67ca4dc8482e6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081",
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"lessThan": "63af086cb5fa6f72fd924f86bea4c2194da663a2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081",
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"lessThan": "8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081",
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"lessThan": "b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "9c5f8a1008a121e4c6b24af211034e24b0b63081",
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"lessThan": "b0b3dc66529676228cb938cbcad66920f735c223",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/bpf/btf.c"
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],
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"versions": [
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{
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"version": "5.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.222",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.112",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.55",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.9",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.8",
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"versionEndExcluding": "5.15.222"
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},
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/1ea3820937f8022e044c41c6e95c84b02741b45f"
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},
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{
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"url": "https://git.kernel.org/stable/c/172756f02663ad45c889c001c1a8cb4082a01a05"
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},
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{
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"url": "https://git.kernel.org/stable/c/934e9ba9f8d05656a48624710be67ca4dc8482e6"
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},
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{
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"url": "https://git.kernel.org/stable/c/63af086cb5fa6f72fd924f86bea4c2194da663a2"
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},
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{
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"url": "https://git.kernel.org/stable/c/8eb4cd72daad3a9ee63d2281bbdd16ce6d9406b1"
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},
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{
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"url": "https://git.kernel.org/stable/c/b8fa56722e9c43bcd59c51fe4c7edd5f4158a11b"
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},
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{
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"url": "https://git.kernel.org/stable/c/b0b3dc66529676228cb938cbcad66920f735c223"
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}
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],
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"title": "bpf: Fix divide-by-zero in btf_struct_walk()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |