UnratedFix available
fou: Don't allow 0 for FOU_ATTR_IPPROTO.
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.249, 5.15.199, 6.1.162, 6.12.68, 6.18.8, 6.6.122
- CVEs
- CVE-2026-23083
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 21:24 UTC · Revision 1
Source evidence
In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor "resubmit"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO.
osv:CVE-2026-23083
Kernel
Fixed versions: 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68, 6.18.8
Complete source record
{
"id": "28149aabcf121ae44983ef0c675fc8a757f46b40ada3becfb37c967cc9215168",
"url": "https://osv.dev/vulnerability/CVE-2026-23083",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "fou: Don't allow 0 for FOU_ATTR_IPPROTO.",
"summary": "In the Linux kernel, the following vulnerability has been resolved: fou: Don't allow 0 for FOU_ATTR_IPPROTO. fou_udp_recv() has the same problem mentioned in the previous patch. If FOU_ATTR_IPPROTO is set to 0, skb is not freed by fou_udp_recv() nor \"resubmit\"-ted in ip_protocol_deliver_rcu(). Let's forbid 0 for FOU_ATTR_IPPROTO.",
"evidence": "osv:CVE-2026-23083",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.10.249",
"evidence": "/affected/1/ranges"
},
{
"value": "5.15.199",
"evidence": "/affected/1/ranges"
},
{
"value": "6.1.162",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.122",
"evidence": "/affected/1/ranges"
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{
"value": "6.12.68",
"evidence": "/affected/1/ranges"
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{
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"affected_versions": []
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],
"severity": "unknown",
"structured": {
"id": "CVE-2026-23083",
"aliases": [
"CVE-2026-23083"
],
"affected": [
{
"ranges": [
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"type": "GIT",
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"database_specific": {
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},
{
"ranges": [
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"type": "ECOSYSTEM",
"events": [
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{
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{
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"events": [
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{
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{
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"events": [
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{
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{
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],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23083.json"
}
}
],
"modified": "2026-10-28T02:30:39.614974972Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
"https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
"https://git.kernel.org/stable/c/1cc98b8887cabb1808d2f4a37cd10a7be7574771",
"https://git.kernel.org/stable/c/611ef4bd9c73d9e6d87bed57a635ff1fdd8c91ea",
"https://git.kernel.org/stable/c/6e983789b7588ee59cbf303583546c043bad8e19",
"https://git.kernel.org/stable/c/7a9bc9e3f42391e4c187e099263cf7a1c4b69ff5",
"https://git.kernel.org/stable/c/9b75dff8446ec871030d8daf5a69e74f5fe8b956",
"https://git.kernel.org/stable/c/b7db31a52c3862a1a32202a273a4c32e7f5f4823",
"https://git.kernel.org/stable/c/c7498f9bc390479ccfad7c7f2332237ff4945b03",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23083.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-23083",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23083.json"
}
},
"related_cves": [
{
"value": "CVE-2026-23083",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 507234,
"published_at": "2026-02-04T16:08:07.561+00:00"
}