High
Security advisory
A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3905
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:45 UTC · Revision 1
Source evidence
A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.
osv:CVE-2021-3905
Complete source record
{
"id": "dec98f5743d5625c75c05ca7211bf26b4d8dd9b9982a382aeab44239b4ec699b",
"url": "https://osv.dev/vulnerability/CVE-2021-3905",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3905",
"summary": "A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.",
"evidence": "osv:CVE-2021-3905",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-3905",
"aliases": [
"CVE-2021-3905"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/openvswitch/ovs",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "db7c86e5d03cd9018739e5fa47cc6be0bad246a0"
},
{
"fixed": "803ed12e31b0377c37d7aa8c94b3b92f2081e349"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openvswitch:openvswitch:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.17.0"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "803ed12e31b0377c37d7aa8c94b3b92f2081e349"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v1.1.0pre2",
"v1.1.0pre1",
"v1.0.1",
"v1.0.0",
"v0.99.2",
"v0.99.1",
"v0.99.0",
"v0.90.4",
"v0.90.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3905.json",
"vanir_signatures": [
{
"id": "CVE-2021-3905-2f55292c",
"digest": {
"length": 620,
"function_hash": "59206550191124162597306143656796702807"
},
"source": "https://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349",
"target": {
"file": "lib/ipf.c",
"function": "ipf_extract_frags_from_batch"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
},
{
"id": "CVE-2021-3905-bc45e5fb",
"digest": {
"threshold": 0.9,
"line_hashes": [
"113026978509954193576006793526224427224",
"336035935748019679433616447587111359138",
"188532591581163255405121483877259391893",
"49480125028801656152872840088186111378"
]
},
"source": "https://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349",
"target": {
"file": "lib/ipf.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T14:26:20Z"
}
}
],
"modified": "2026-10-20T14:26:20.964618155Z",
"provider": "osv",
"references": [
"https://access.redhat.com/security/cve/CVE-2021-3905",
"https://security.gentoo.org/glsa/202311-16",
"https://bugzilla.redhat.com/show_bug.cgi?id=2019692",
"https://github.com/openvswitch/ovs-issues/issues/226",
"https://github.com/openvswitch/ovs/commit/803ed12e31b0377c37d7aa8c94b3b92f2081e349",
"https://ubuntu.com/security/CVE-2021-3905"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "21.10"
},
{
"last_affected": "21.10"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "35"
},
{
"last_affected": "35"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:enterprise_linux_fast_datapath:7.0:*:*:*:*:*:*:*",
"cpe:2.3:a:redhat:enterprise_linux_fast_datapath:8.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_fast_datapath",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
},
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-3905",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388990,
"published_at": "2022-08-23T16:15:10.177+00:00"
}