Medium
Security advisory
Under certain circumstances, the ix86_expand_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.7, 4.8, 4.9, 5 before 5.5, and 6 before 6.4 will generate instruction sequences that clobber the status flag of the RDRAND and RDSEED intrinsics before it can be read, potentially causing failures of these instructions to go unreported. This could potentially lead to less randomness in random number generation.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2017-11671
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:54 UTC · Revision 1
Source evidence
Under certain circumstances, the ix86_expand_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.7, 4.8, 4.9, 5 before 5.5, and 6 before 6.4 will generate instruction sequences that clobber the status flag of the RDRAND and RDSEED intrinsics before it can be read, potentially causing failures of these instructions to go unreported. This could potentially lead to less randomness in random number generation.
osv:CVE-2017-11671
Complete source record
{
"id": "38d93397205fbafb464d21a24e8b1de30c5b4f843483cee643e75ee468545c74",
"url": "https://osv.dev/vulnerability/CVE-2017-11671",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2017-11671",
"summary": "Under certain circumstances, the ix86_expand_builtin function in i386.c in GNU Compiler Collection (GCC) version 4.6, 4.7, 4.8, 4.9, 5 before 5.5, and 6 before 6.4 will generate instruction sequences that clobber the status flag of the RDRAND and RDSEED intrinsics before it can be read, potentially causing failures of these instructions to go unreported. This could potentially lead to less randomness in random number generation.",
"evidence": "osv:CVE-2017-11671",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2017-11671",
"aliases": [
"CVE-2017-11671"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/gcc-mirror/gcc",
"type": "GIT",
"events": [
{
"introduced": "7a3af1a36b1965ae3d60e1f397a0d3ca17619d43"
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{
"last_affected": "91c632c88994dca583bcd94e39cd3eba1506ecfe"
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"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:gnu:gcc:4.6:*:*:*:*:*:*:*",
"range": [
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"introduced": "4.6"
},
{
"last_affected": "4.6"
}
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"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:gnu:gcc:4.7:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.7"
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{
"last_affected": "4.7"
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{
"cpe": "cpe:2.3:a:gnu:gcc:4.8:*:*:*:*:*:*:*",
"range": [
{
"introduced": "4.8"
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{
"last_affected": "4.8"
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{
"cpe": "cpe:2.3:a:gnu:gcc:4.9:*:*:*:*:*:*:*",
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{
"cpe": "cpe:2.3:a:gnu:gcc:5.1:*:*:*:*:*:*:*",
"range": [
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"introduced": "5.1"
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{
"last_affected": "5.1"
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{
"cpe": "cpe:2.3:a:gnu:gcc:5.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.2"
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{
"last_affected": "5.2"
}
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"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:gnu:gcc:5.3:*:*:*:*:*:*:*",
"range": [
{
"introduced": "5.3"
},
{
"last_affected": "5.3"
}
],
"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:gnu:gcc:5.4:*:*:*:*:*:*:*",
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"introduced": "5.4"
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"last_affected": "5.4"
}
],
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{
"cpe": "cpe:2.3:a:gnu:gcc:6.1:*:*:*:*:*:*:*",
"range": [
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"introduced": "6.1"
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{
"cpe": "cpe:2.3:a:gnu:gcc:6.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.2"
},
{
"last_affected": "6.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:gnu:gcc:6.3:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.3"
},
{
"last_affected": "6.3"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"4.6",
"4.7",
"4.8",
"4.9",
"5.1",
"5.2",
"5.3",
"5.4",
"6.1",
"6.2",
"6.3"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-11671.json"
}
}
],
"modified": "2026-10-24T10:30:46.151864620Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHSA-2018:0849",
"https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80180",
"https://gcc.gnu.org/ml/gcc-patches/2017-03/msg01349.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:a:gnu:gcc:5.0:*:*:*:*:*:*:*",
"cpe:2.3:a:gnu:gcc:6.0:*:*:*:*:*:*:*"
],
"vendor_product": "gnu:gcc",
"extracted_events": [
{
"range": [
{
"introduced": "5.0"
},
{
"last_affected": "5.0"
},
{
"introduced": "6.0"
},
{
"last_affected": "6.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2017-11671",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 436269,
"published_at": "2017-07-26T21:29:00.207+00:00"
}