HighFix available
netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack() The timestamp-only fast path dereferences the option stream as *(__be32 *)ptr, which assumes 4-byte alignment that the TCP option stream does not guarantee. Use get_unaligned_be32() instead, which reads the value safely and already returns host byte order, so the htonl() on the comparison constant can be dropped. This matches the existing get_unaligned_be32() use later in the same function.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.271, 5.15.222, 6.1.189, 6.12.111, 6.18.53, 6.6.158
- CVEs
- CVE-2026-97417
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 00:53 UTC · Revision 1
Source evidence
netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()
core-osv · Original sourcePublished 24 Sept 2026, 16:03 UTC
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack() The timestamp-only fast path dereferences the option stream as *(__be32 *)ptr, which assumes 4-byte alignment that the TCP option stream does not guarantee. Use get_unaligned_be32() instead, which reads the value safely and already returns host byte order, so the htonl() on the comparison constant can be dropped. This matches the existing get_unaligned_be32() use later in the same function.
osv:CVE-2026-97417
Kernel
Fixed versions: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53
Complete source record
{
"id": "a5f3dd538c31aeb178aa86814d5b00ef8d2fbfda158fc26332db2b0c38c22e48",
"url": "https://osv.dev/vulnerability/CVE-2026-97417",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack()",
"summary": "In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack() The timestamp-only fast path dereferences the option stream as *(__be32 *)ptr, which assumes 4-byte alignment that the TCP option stream does not guarantee. Use get_unaligned_be32() instead, which reads the value safely and already returns host byte order, so the htonl() on the comparison constant can be dropped. This matches the existing get_unaligned_be32() use later in the same function.",
"evidence": "osv:CVE-2026-97417",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "5.10.271",
"evidence": "/affected/1/ranges"
},
{
"value": "5.15.222",
"evidence": "/affected/1/ranges"
},
{
"value": "6.1.189",
"evidence": "/affected/1/ranges"
},
{
"value": "6.6.158",
"evidence": "/affected/1/ranges"
},
{
"value": "6.12.111",
"evidence": "/affected/1/ranges"
},
{
"value": "6.18.53",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "CVE-2026-97417",
"aliases": [
"CVE-2026-97417"
],
"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://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "bb9fc37358ffa9de1cc2b2b6f1a559b926ef50d9"
},
{
"fixed": "740ad3d17a281f7764dda4dbeb37cea52e2e31ae"
},
{
"fixed": "a0523267de2523522b0f70972dd1ffa22ec6176c"
},
{
"fixed": "55bcc3376cd7b18954cc9814da697504fdaf12bf"
},
{
"fixed": "0d5ad732e4fdc569eb85861115e8f7b4c2c67852"
},
{
"fixed": "7ecfa46a536578a7ed335ddf31a854127268c27c"
},
{
"fixed": "4abc1af7ac209c066f4e5dd75cdd56876e5829a9"
},
{
"fixed": "d3bf9eae486490832bd08fd62ab0ac601f346bd4"
}
]
}
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97417.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "3.1.0"
},
{
"fixed": "5.10.271"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.11.0"
},
{
"fixed": "5.15.222"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.16.0"
},
{
"fixed": "6.1.189"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.2.0"
},
{
"fixed": "6.6.158"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.7.0"
},
{
"fixed": "6.12.111"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
},
{
"fixed": "6.18.53"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97417.json"
}
}
],
"modified": "2026-10-28T02:30:48.880215522Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/0d5ad732e4fdc569eb85861115e8f7b4c2c67852",
"https://git.kernel.org/stable/c/4abc1af7ac209c066f4e5dd75cdd56876e5829a9",
"https://git.kernel.org/stable/c/55bcc3376cd7b18954cc9814da697504fdaf12bf",
"https://git.kernel.org/stable/c/740ad3d17a281f7764dda4dbeb37cea52e2e31ae",
"https://git.kernel.org/stable/c/7ecfa46a536578a7ed335ddf31a854127268c27c",
"https://git.kernel.org/stable/c/a0523267de2523522b0f70972dd1ffa22ec6176c",
"https://git.kernel.org/stable/c/d3bf9eae486490832bd08fd62ab0ac601f346bd4",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97417.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-97417",
"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/2026/97xxx/CVE-2026-97417.json"
}
},
"related_cves": [
{
"value": "CVE-2026-97417",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 516766,
"published_at": "2026-09-24T16:03:27.069+00:00"
}