526 lines
25 KiB
JSON
526 lines
25 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-2026-23456",
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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": "2026-01-13T15:37:46.020Z",
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"datePublished": "2026-04-03T15:15:37.534Z",
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"dateUpdated": "2026-11-10T12:43:28.114Z"
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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": "2026-08-05T12:21:55.155Z"
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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\nnetfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case\n\nIn decode_int(), the CONS case calls get_bits(bs, 2) to read a length\nvalue, then calls get_uint(bs, len) without checking that len bytes\nremain in the buffer. The existing boundary check only validates the\n2 bits for get_bits(), not the subsequent 1-4 bytes that get_uint()\nreads. This allows a malformed H.323/RAS packet to cause a 1-4 byte\nslab-out-of-bounds read.\n\nAdd a boundary check for len bytes after get_bits() and before\nget_uint()."
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}
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],
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"metrics": [
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{
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
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"baseScore": 8.2,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The vulnerable parser is reached by network-delivered H.323/RAS UDP traffic when the nf_conntrack_h323 RAS helper is active on a firewall/NAT gateway. A remote peer can supply the malformed packet payload that drives DecodeRasMessage() into decode_int().\nAC:L - The trigger is a deterministic malformed CONS integer where the 2-bit length claims 1-4 bytes that are not present. No race or attacker-external condition is required once the helper is attached to the flow.\nPR:N - The packet decoding path has no authentication or privilege check; it runs on received network traffic before any H.323 protocol-level trust decision. Helper configuration/loading may be administrative setup, but the attacker sending the malformed packet needs no privileges on the target.\nUI:N - Exploitation only requires sending crafted network traffic to a system processing H.323/RAS through conntrack. No victim user action is required.\nS:U - The impact is within the kernel/network filtering security authority of the affected system. There is no guest-to-host, sandbox, or separate authority boundary crossed.\nC:L - The bug is a bounded 1-4 byte slab out-of-bounds read from adjacent kernel memory. Because the read is strictly limited to a few bytes and not a broad arbitrary read primitive, confidentiality impact is limited.\nI:N - The flaw is an out-of-bounds read only; it does not write beyond bounds or corrupt kernel objects. The decoded value only affects existing H.323 conntrack timeout handling.\nA:H - A malformed unauthenticated packet can repeatedly trigger a slab out-of-bounds read in softirq packet processing, which can produce a KASAN/oops/panic on hardened or debug kernels. This is defensibly a high availability impact for affected deployments."
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}
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}
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}
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],
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"title": "netfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case",
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"defaultStatus": "unknown"
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
|
|
},
|
|
{
|
|
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2026-23456",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "yes"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-10-16T15:08:25.282768Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-125",
|
|
"description": "CWE-125 Out-of-bounds Read"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-10-19T18:35:44.721Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |